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One of the first people to articulate this point of view, set aside from a medicinal context, was American author [[Fitz Hugh Ludlow]] (1836–1870) in his book ''[[The Hasheesh Eater]]'' (1857):{{quote|[D]rugs are able to bring humans into the neighborhood of divine experience and can thus carry us up from our personal fate and the everyday circumstances of our life into a higher form of reality. It is, however, necessary to understand precisely what is meant by the use of drugs. We do not mean the purely physical craving...That of which we speak is something much higher, namely the knowledge of the possibility of the soul to enter into a lighter being, and to catch a glimpse of deeper insights and more magnificent visions of the beauty, truth, and the divine than we are normally able to spy through the cracks in our prison cell. But there are not many drugs which have the power of stilling such craving. The entire catalog, at least to the extent that research has thus far written it, may include only opium, hashish, and in rarer cases [[alcohol]], which has enlightening effects only upon very particular characters.<ref>The Hashish Eater (1857) pg. 181</ref>}}
One of the first people to articulate this point of view, set aside from a medicinal context, was American author [[Fitz Hugh Ludlow]] (1836–1870) in his book ''[[The Hasheesh Eater]]'' (1857):{{quote|[D]rugs are able to bring humans into the neighborhood of divine experience and can thus carry us up from our personal fate and the everyday circumstances of our life into a higher form of reality. It is, however, necessary to understand precisely what is meant by the use of drugs. We do not mean the purely physical craving...That of which we speak is something much higher, namely the knowledge of the possibility of the soul to enter into a lighter being, and to catch a glimpse of deeper insights and more magnificent visions of the beauty, truth, and the divine than we are normally able to spy through the cracks in our prison cell. But there are not many drugs which have the power of stilling such craving. The entire catalog, at least to the extent that research has thus far written it, may include only opium, hashish, and in rarer cases [[alcohol]], which has enlightening effects only upon very particular characters.<ref>The Hashish Eater (1857) pg. 181</ref>}}


This relationship is not limited to humans. A number of animals consume different psychoactive plants, animals, berries and even fermented fruit, becoming intoxicated, such as cats after consuming [[nepeta|catnip]]. Traditional legends of sacred plants often contain references to animals that introduced humankind to their use.<ref name="samorini">{{cite book | last=Samorini | first=Giorgio | year=2002 | title=Animals And Psychedelics: The Natural World & The Instinct To Alter Consciousness | publisher=Park Street Press | isbn=0-89281-986-3 }}</ref> Animals and psychoactive plants appear to have [[Coevolution|co-evolved]], possibly explaining why these chemicals and their receptors exist within the nervous system.<ref name="albert">{{cite web | author=Albert, David Bruce, Jr. (1993) | title=Event Horizons of the Psyche | url=http://www.csp.org/chrestomathy/event_horizons.html | accessdate=February 2, 2006 | deadurl=no | archiveurl=htpain 90% of adults consume caffeine daily.<ref name="demon drink">{{cite journal | last = Lovett | first = Richard | title = Coffee: The demon drink? | journal = New Scientist | issue = 2518 | date = 24 September 2005 | url = https://www.newscientist.com/article.ns?id=mg18725181.700 | accessdate = 2007-11-19 | format = fee required | deadurl = no | archiveurl = https://web.archive.org/web/20071024030810/http://www.newscientist.com/article.ns?id=mg18725181.700 | archivedate = 24 October 2007 | df = }}</ref>
This relationship is not limited to humans. A number of animals consume different psychoactive plants, animals, berries and even fermented fruit, becoming intoxicated, such as cats after consuming [[nepeta|catnip]]. Traditional legends of sacred plants often contain references to animals that introduced humankind to their use.<ref name="samorini">{{cite book | last=Samorini | first=Giorgio | year=2002 | title=Animals And Psychedelics: The Natural World & The Instinct To Alter Consciousness | publisher=Park Street Press | isbn=0-89281-986-3 }}</ref> Animals and psychoactive plants appear to have [[Coevolution|co-evolved]], possibly explaining why these chemicals and their receptors exist within the nervous system.<ref name="albert">{{cite web | author=Albert, David Bruce, Jr. (1993) | title=Event Horizons of the Psyche | url=http://www.csp.org/chrestomathy/event_horizons.html | accessdate=February 2, 2006 | deadurl=no | archiveurl=https://web.archive.org/web/20060927063611/http://www.csp.org/chrestomathy/event_horizons.html | archivedate=September 27, 2006 | df= }}</ref>


During the 20th century, many governments across the world initially responded to the use of recreational drugs by banning them and making their use, supply, or trade a criminal offense. A notable example of this was [[Prohibition]] in the United States, where alcohol was made illegal for 13 years. However, many governments, government officials and persons in law enforcement have concluded that illicit drug use cannot be sufficiently stopped through criminalization. Organizations such as Law Enforcement Against Prohibition (LEAP) have come to such a conclusion, believing:
Psychoactive drugs are divided into different groups according to their pharmacological effects. Commonly used psychoactive drugs and groups:
{{quote|[T]he existing drug policies have failed in their intended goals of addressing the problems of crime, drug abuse, addiction, juvenile drug use, stopping the flow of illegal drugs into this country and the internal sale and use of illegal drugs. By fighting a war on drugs the government has increased the problems of society and made them far worse. A system of regulation rather than prohibition is a less harmful, more ethical and a more effective public policy.<ref>{{cite web|url=http://www.leap.cc/cms/index.php?name=Content&pid=5|title=|publisher=|accessdate=2013-05-30|deadurl=yes|archiveurl=https://web.archive.org/web/20080913235116/http://www.leap.cc/cms/index.php?name=Content&pid=5|archivedate=2008-09-13|df=}}</ref>{{Failed verification|date=May 2013}}}}In some countries, there has been a move toward harm reduction by health services, where the use of illicit drugs is neither condoned nor promoted, but services and support are provided to ensure users have adequate factual information readily available, and that the negative effects of their use be minimized. Such is the case of Portuguese drug policy of decriminalization, which achieved its primary goal of reducing the adverse health effects of drug abuse.<ref>{{cite web |url=http://www.scientificamerican.com/article.cfm?id=portugal-drug-decriminalization |title=5 Years After: Portugal's Drug Decriminalization Policy Shows Positive Results |publisher=Scientific American |accessdate=2013-05-30 |deadurl=no |archiveurl=https://web.archive.org/web/20130815160507/http://www.scientificamerican.com/article.cfm?id=portugal-drug-decriminalization |archivedate=2013-08-15 |df= }}</ref>
* [[Anxiolytics]]
::Example: [[benzodiazepine]]s, [[barbiturate]]s
* [[Empathogen–entactogen]]s
::Example: [[MDMA]] (Ecstasy), [[3,4-Methylenedioxyamphetamine|MDA]], [[6-APB]], [[Alpha-Methyltryptamine|AMT]]
* [[Stimulant]]s ("uppers"). This category comprises substances that wake one up, stimulate the mind, and may cause euphoria, but do not affect perception.
::Examples: [[amphetamine]], [[caffeine]], [[cocaipain ne]], [[nicotine]], [[modafinil]]
* [[Depressant]]s ("downers"), including [[sedative]]s, [[hypnotic]]s, and [[opioid]]s. This category includes all of the calmative, sleep-inducing, anxiety-reducing, anesthetizing substances, which sometimes induce perceptual changes, such as dream images, and also often evoke feelings of euphoria.
::Examples: [[ethanol]] ([[alcoholic beverage]]s), [[opioid]]s, [[cannabis (drug)|cannabis]], [[barbiturate]]s, [[benzodiazepine]]s.
* [[Hallucinogen]]s, including [[psychedelics]], pain [[dissociative]]s and [[deliriant]]s. This category encompasses all those substances that produce distinct alterations in perception, sensation of space and time, and emotional states<ref>{{cite journal | author = Bersani FS, Corazza O, Simonato P, Mylokosta A, Levari E, Lovaste R, Schifano F | title = Drops of madness? Recreational misuse of tropicamide collyrium; early warning alerts from Russia and Italy | journal = General Hospital Psychiatry | volume = 35 | issue = 5 | pages = 571–3 | year = 2013 | pmid = 23706777 | doi = 10.1016/j.genhosppsych.2013.04.013 | last2 = Corazza | last3 = Simonato | last4 = Mylokosta | last5 = Levari | last6 = Lovaste | last7 = Schifano }}</ref>
::Examples: [[psilocybin]], [[LSD]], ''[[Salvia divinorum]]'', [[nitrous oxide]] and [[scopolamine]].


==Uses==
== Purposes ==
Psychoactive substances are used by humans for a number of different purposes to achieve a specific end. These uses vary widely between cultures. Some substances may have controlled or illegal uses while others may have shamanic purposes, and still others are used medicinally. Other examples would be social drinking, [[nootropic]], or sleep aids. [[Caffeine]] is the world's most widely consumed psychoactive substance, but unlike many others, it is legal and unregulated in nearly all jurisdictions. In North America, 90% of adults consume caffeine daily.<ref name="demon drink">{{cite journal | last = Lovett | first = Richard | title = Coffee: The demon drink? | journal = New Scientist | issue = 2518 | date = 24 September 2005 | url = https://www.newscientist.com/article.ns?id=mg18725181.700 | accessdate = 2007-11-19 | format = fee required | deadurl = no | archiveurl = https://web.archive.org/web/20071024030810/http://www.newscientist.com/article.ns?id=mg18725181.700 | archivedate = 24 October 2007 | df = }}</ref>

=== Anesthesia ===
{{Main article| Anesthesia}}
[[General anaesthetic|General anesthetics]] are a class of psychoactive drug used on people to block physical pain and other sensations. Most anesthetics induce unconsciousness, allowing the person to undergo medical procedures like [[surgery]] without the feelings of [[physical pain]] or [[emotional trauma]].<ref>Medline Plus. [https://www.nlm.nih.gov/medlineplus/anesthesia.html Anesthesia.] {{webarchive|url=https://web.archive.org/web/20160704221735/https://www.nlm.nih.gov/medlineplus/anesthesia.html |date=2016-07-04 }} Accessed on July 16, 2007.</ref> To induce unconsciousness, anesthetics affect the [[GABA]] and [[NMDA]] systems. For example, [[propofol]] is a GABA agonist,<ref>{{cite journal | author = Li X, Pearce RA | title = Effects of halothane on GABA(A) receptor kinetics: evidence for slowed agonist unbinding | journal = The Journal of Neuroscience | volume = 20 | issue = 3 | pages = 899–907 | year = 2000 | pmid = 10648694 | doi = | last2 = Pearce }}</ref> and [[ketamine]] is an [[NMDA receptor antagonist]].<ref>{{cite journal | author = Harrison NL, Simmonds MA | title = Quantitative studies on some antagonists of N-methyl D-aspartate in slices of rat cerebral cortex | journal = British Journal of Pharmacology | volume = 84 | issue = 2 | pages = 381–91 | year = 1985 | pmid = 2858237 | pmc = 1987274 | doi = 10.1111/j.1476-5381.1985.tb12922.x | last2 = Simmonds }}</ref>

=== Pain management ===
{{Main article| Analgesics}}
Psychoactive drugs are often prescribed to [[pain management|manage pain]]. The subjective experience of pain is primarily regulated by [[endogenous]] [[opioid|opioid peptides]]. Thus, pain can often be managed using psychoactives that operate on this neurotransmitter system, also known as [[opioid receptor agonist]]s. This class of drugs can be highly addictive, and includes [[opiate]] [[narcotics]], like [[morphine]] and [[codeine]].<ref>{{cite journal | author = Quiding H, Lundqvist G, Boréus LO, Bondesson U, Ohrvik J | title = Analgesic effect and plasma concentrations of codeine and morphine after two dose levels of codeine following oral surgery | journal = European Journal of Clinical Pharmacology | volume = 44 | issue = 4 | pages = 319–23 | year = 1993 | pmid = 8513842 | doi = 10.1007/BF00316466 | last2 = Lundqvist | last3 = Boréus | last4 = Bondesson | last5 = Ohrvik }}</ref> [[NSAID]]s, such as [[aspirin]] and [[ibuprofen]], are also analgesics. These agents also reduce [[eicosanoid]]-mediated [[inflammation]] by inhibiting the enzyme [[cyclooxygenase]].

=== Mental disorders ===
{{Main article| Psychiatric medications}}
[[File:Zoloft bottles.jpg|thumb|250px|Zoloft ([[sertraline]]) is an [[SSRI]] [[antidepressant]].]]

Psychiatric medications are psychoactive drugs prescribed for the management of [[mental disorders|mental and emotional disorders]], or to aid in overcoming [[challenging behavior]].<ref>{{cite journal |last1=Matson |first1=Johnny L. |last2=Neal |first2=Daniene |title=Psychotropic medication use for challenging behaviors in persons with intellectual disabilities: An overview |journal=Research in Developmental Disabilities |volume=30 |issue=3 |pages=572–86 |year=2009 |pmid=18845418 |doi=10.1016/j.ridd.2008.08.007 }}</ref> There are six major classes of psychiatric medications:
* [[Antidepressants]] treat disorders such as [[clinical depression]], [[dysthymia]], [[anxiety]], [[eating disorders]] and [[borderline personality disorder]].<ref>{{cite journal | author = Schatzberg AF | title = New indications for antidepressants | journal = The Journal of Clinical Psychiatry | volume = 61 | issue = 11 | pages = 9–17 | year = 2000 | pmid = 10926050 }}</ref>
* [[Stimulants]], used to treat disorders such as [[attention deficit hyperactivity disorder]] and [[narcolepsy]], and for [[Anorectic|weight reduction]].
* [[Antipsychotics]], used to treat [[psychosis|psychotic symptoms]], such as those associated with [[schizophrenia]] or severe [[mania]], or as adjuncts to relieve clinical depression.
* [[Mood stabilizers]], used to treat [[bipolar disorder]] and [[schizoaffective disorder]].
* [[Anxiolytics]], used to treat [[anxiety disorder]]s.
* [[Depressants]], used as [[hypnotics]], [[sedative]]s, and [[anesthetic]]s, depending upon dosage.

In addition, several psychoactive substances are currently employed to treat various addictions. These include [[acamprosate]] or [[naltrexone]] in the treatment of alcoholism, or [[methadone]] or [[buprenorphine]] [[Opioid replacement therapy|maintenance therapy]] in the case of [[opioid addiction]].<ref>{{Cite book|url=https://books.google.com/books?id=_MySDAAAQBAJ&pg=PA606|title=The Oxford Handbook of Substance Use and Substance Use Disorders|last=|first=|vauthors=Swift RM|publisher=Oxford University Press|year=2016|isbn=9780199381708|veditors=Sher KJ|location=|pages=601–603, 606|language=en|chapter=Pharmacotherapy of Substance Use, Craving, and Acute Abstinence Syndromes|deadurl=no|archiveurl=https://web.archive.org/web/20180509181047/https://books.google.com/books?id=_MySDAAAQBAJ&pg=PA606|archivedate=2018-05-09|df=}}</ref>

Exposure to psychoactive drugs can cause [[neuroplasticity|changes to the brain]] that counteract or augment some of their effects; these changes may be beneficial or harmful. However, there is a significant amount of evidence that relapse rate of mental disorders negatively corresponds with length of properly followed treatment regimens (that is, relapse rate substantially declines over time), and to a much greater degree than placebo.<ref>{{cite journal |doi=10.1192/bjp.179.42.s4 |pmid=11532820 |title=Clinical importance of long-term antidepressant treatment |journal=The British Journal of Psychiatry |volume=179 |issue=42 |pages=S4–8 |year=2001 |last1=Hirschfeld |first1=Robert M. A. }}</ref>

===Recreation===
{{Main article| Recreational drug use}}

Many psychoactive substances are used for their mood and perception altering effects, including those with accepted uses in medicine and psychiatry. Examples of psychoactive substances include [[caffeine]], [[Alcoholic beverage|alcohol]], [[cocaine]], [[lysergic acid diethylamide|LSD]], [[nicotine]] and [[cannabis (drug)|cannabis]].<ref name="who">[http://www.who.int/substance_abuse/publications/en/Neuroscience_E.pdf Neuroscience of Psychoactive Substance Use and Dependence] {{webarchive|url=https://web.archive.org/web/20061003085309/http://www.who.int/substance_abuse/publications/en/Neuroscience_E.pdf |date=2006-10-03 }} by the [[World Health Organization]]. Retrieved 5 July 2007.</ref> Classes of drugs frequently used recreationally include:
* [[Stimulants]], which activate the [[central nervous system]]. These are used recreationally for their [[Euphoria (emotion)|euphoric]] effects.
* [[Hallucinogens]] ([[psychedelics]], [[dissociatives]] and [[deliriants]]), which induce perceptual and cognitive alterations.
* [[Hypnotics]], which depress the central nervous system.
* [[Opioid|Opioid analgesics]], which also depress the central nervous system. These are used recreationally because of their euphoric effects.
* [[Inhalant]]s, in the forms of gas aerosols, or solvents, which are inhaled as a vapor because of their stupefying effects. Many inhalants also fall into the above categories (such as [[nitrous oxide]] which is also an analgesic).

In some modern and ancient cultures, drug usage is seen as a [[Social status|status]] symbol. Recreational drugs are seen as status symbols in settings such as at [[nightclub]]s and parties.<ref>{{cite journal | author = Anderson TL | title = Drug identity change processes, race, and gender. III. Macrolevel opportunity concepts | journal = Substance Use & Misuse | volume = 33 | issue = 14 | pages = 2721–35 | year = 1998 | pmid = 9869440 | doi = 10.3109/10826089809059347 }}</ref> For example, in [[ancient Egypt]], gods were commonly pictured holding hallucinogenic plants.<ref>{{cite journal | author = Bertol E, Fineschi V, Karch SB, Mari F, Riezzo I | title = Nymphaea cults in ancient Egypt and the New World: a lesson in empirical pharmacology | journal = Journal of the Royal Society of Medicine | volume = 97 | issue = 2 | pages = 84–5 | year = 2004 | pmid = 14749409 | pmc = 1079300 | doi = 10.1177/014107680409700214 | last2 = Fineschi | last3 = Karch | last4 = Mari | last5 = Riezzo }}</ref>

Because there is controversy about regulation of recreational drugs, there is an [[arguments for and against drug prohibition|ongoing debate about drug prohibition]]. Critics of prohibition believe that regulation of recreational drug use is a violation of personal autonomy and [[liberty|freedom]].<ref>{{cite journal | author = Hayry M | title = Prescribing cannabis: freedom, autonomy, and values | journal = Journal of Medical Ethics | volume = 30 | issue = 4 | pages = 333–6 | year = 2004 | pmid = 15289511 | pmc = 1733898 | doi = 10.1136/jme.2002.001347 }}</ref> In the United States, critics have noted that prohibition or regulation of recreational and spiritual drug use might be [[unconstitutional]], and causing more harm than is prevented.<ref>Barnett, Randy E. [http://law.wustl.edu/Journal/22/p29Barnett.pdf "The Presumption of Liberty and the Public Interest: Medical Marijuana and Fundamental Rights"] {{webarchive|url=https://web.archive.org/web/20070711001509/http://law.wustl.edu/Journal/22/p29Barnett.pdf |date=2007-07-11 }}. Retrieved 4 July 2007.</ref>

===Ritual and spiritual===
[[File:Timothy-Leary-Los-Angeles-1989.jpg|thumb|upright|[[Timothy Leary]] was a leading proponent of spiritual hallucinogen use.]]
{{Main article| Entheogens}}
Certain psychoactives, particularly hallucinogens, have been used for religious purposes since prehistoric times. Native Americans have used [[peyote]] cacti containing [[mescaline]] for religious ceremonies for as long as 5700 years.<ref>{{cite journal | author = El-Seedi HR, De Smet PA, Beck O, Possnert G, Bruhn JG | title = Prehistoric peyote use: alkaloid analysis and radiocarbon dating of archaeological specimens of Lophophora from Texas | journal = Journal of Ethnopharmacology | volume = 101 | issue = 1–3 | pages = 238–42 | year = 2005 | pmid = 15990261 | doi = 10.1016/j.jep.2005.04.022 | last2 = De Smet | last3 = Beck | last4 = Possnert | last5 = Bruhn }}</ref> The [[muscimol]]-containing [[Amanita muscaria]] mushroom was used for ritual purposes throughout prehistoric Europe.<ref>{{cite journal | author = Vetulani J | title = Drug addiction. Part I. Psychoactive substances in the past and presence | journal = Polish Journal of Pharmacology | volume = 53 | issue = 3 | pages = 201–14 | year = 2001 | pmid = 11785921 | doi = }}</ref>

The use of entheogens for religious purposes resurfaced in the West during the [[Counterculture of the 1960s|counterculture movements]] of the 1960s and 70s. Under the leadership of [[Timothy Leary]], new spiritual and intention-based movements began to use [[LSD]] and other hallucinogens as tools to access deeper inner exploration. In the United States, the use of peyote for ritual purposes is protected only for members of the [[Native American Church]], which is allowed to cultivate and distribute [[peyote]]. However, the genuine religious use of peyote, regardless of one's personal ancestry, is protected in Colorado, Arizona, New Mexico, Nevada, and Oregon.<ref>{{cite journal | author = Bullis RK | title = Swallowing the scroll: legal implications of the recent Supreme Court peyote cases | journal = Journal of Psychoactive Drugs | volume = 22 | issue = 3 | pages = 325–32 | year = 1990 | pmid = 2286866 | doi = 10.1080/02791072.1990.10472556}}</ref>

=== Military ===
{{Main article|Psychochemical warfare|List of drugs used by militaries}}
Psychoactive drugs have been used in military applications as [[non-lethal weapon]]s.

Both military and civilian American intelligence officials are known to have used psychoactive drugs while interrogating captives apprehended in its [[War on Terror]]. In July 2012, [[Jason Leopold]] and Jeffrey Kaye, psychologists and human rights workers, had a [[Freedom of Information Act]] request fulfilled that confirmed that the use of psychoactive drugs during interrogation was a long-standing
practice.<ref name=Truthout2012-07-11>
{{cite news| url = http://truth-out.org/news/item/10248-exclusive-department-of-defense-declassifies-report-on-alleged-drugging-of-detainees| title = EXCLUSIVE: DoD Report Reveals Some Detainees Interrogated While Drugged, Others "Chemically Restrained"| publisher = [[Truthout]]|author1=Jason Leopold |author2=Jeffrey Kaye | date = 2011-07-11| archivedate = 2012-07-14| archiveurl = https://www.webcitation.org/query?url=http%3A%2F%2Ftruth-out.org%2Fnews%2Fitem%2F10248-exclusive-department-of-defense-declassifies-report-on-alleged-drugging-of-detainees&date=2012-07-14| deadurl = no| quote = Truthout obtained a copy of the report – "Investigation of Allegations of the Use of Mind-Altering Drugs to Facilitate Interrogations of Detainees" – prepared by the DoD's deputy inspector general for intelligence in September 2009, under a Freedom of Information Act (FOIA) request we filed nearly two years ago.}}
</ref><ref name=Wired2012-07-11>
{{cite news| url = https://www.wired.com/dangerroom/2012/07/gitmo/| title = U.S. Injected Gitmo Detainees With 'Mind Altering' Drugs| publisher = [[Wired magazine]]| author = Robert Beckhusen| date = 2012-07-11| page = | accessdate = 2012-07-14| archivedate = 2012-07-14| archiveurl = https://www.webcitation.org/query?url=http%3A%2F%2Fwww.wired.com%2Fdangerroom%2F2012%2F07%2Fgitmo%2F&date=2012-07-14| deadurl = no| quote = That's according to a recently declassified report (.pdf) from the Pentagon's inspector general, obtained by Truthout's Jeffrey Kaye and Jason Leopold after a Freedom of Information Act Request. In it, the inspector general concludes that "certain detainees, diagnosed as having serious mental health conditions being treated with psychoactive medications on a continuing basis, were interrogated." The report does not conclude, though, that anti-psychotic drugs were used specifically for interrogation purposes.}}
</ref>
Captives and former captives had been reporting medical staff collaborating with interrogators to drug captives with powerful psychoactive drugs prior to interrogation since the very first captives' release.<ref name=Bbc2003-05-23>
{{cite news| url=http://news.bbc.co.uk/2/hi/south_asia/3051501.stm| title=Pakistani relives Guantanamo ordeal| publisher=BBC News| author=Haroon Rashid| date=2003-05-23| accessdate=2009-01-09| archivedate = 2012-07-14| archiveurl = https://www.webcitation.org/query?url=http%3A%2F%2Fnews.bbc.co.uk%2F2%2Fhi%2Fsouth_asia%2F3051501.stm&date=2012-07-14| deadurl = no| quote = Mr Shah alleged that the Americans had given him injections and tablets prior to interrogations. "They used to tell me I was mad," the 23-year-old told the BBC in his native village in Dir district near the Afghan border. I was given injections at least four or five times as well as different tablets. I don't know what they were meant for."}}
</ref><ref name=Guardian2003-12-03>
{{cite news| url = https://www.theguardian.com/guantanamo/story/0,13743,1098604,00.html| title = People the law forgot| publisher = The Guardian| date = 2003-12-03| page = | accessdate = 2012-07-14| archivedate = 2012-07-14| archiveurl = https://www.webcitation.org/query?url=http%3A%2F%2Fwww.guardian.co.uk%2Fworld%2F2003%2Fdec%2F03%2Fguantanamo.usa1&date=2012-07-14| deadurl = no| quote = The biggest damage is to my brain. My physical and mental state isn't right. I'm a changed person. I don't laugh or enjoy myself much.| location=London| first=James| last=Meek}}
</ref>
In May 2003, recently released [[Pakistani captives in Guantanamo|Pakistani captive]] [[Sha Mohammed Alikhel]] described the routine use of psychoactive drugs in the [[Guantanamo Bay detention center]]. He said that [[Jihan Wali]], a captive kept in a nearby cell, was rendered catatonic through the use of these drugs.

The military justice system has also been known to use psychoactive drugs to obtain a conviction. (U.S. vs. Juillerat)<ref>ACM 34205, afcca.law.af.mil</ref>

Additionally, militaries worldwide have used or are using various psychoactive drugs to [[Performance-enhancing substance|improve performance]] of soldiers by suppressing hunger, increasing the ability to sustain effort without food, increasing and lengthening [[wakefulness]] and concentration, suppressing [[fear]], reducing empathy, and improving reflexes and memory-recall among other things.<ref name="Stoker2013">{{cite web |last1=Stoker |first1=Liam |title=Analysis Creating Supermen: battlefield performance enhancing drugs |url=https://www.army-technology.com/features/featurecreating-supermen-battlefield-performance-enhancing-drugs/ |website=Army Technology |publisher=[[Verdict Media Limited]] |accessdate=22 June 2018 |date=14 April 2013}}</ref><ref>{{cite web|last1=Kamienski|first1=Lukasz|title=The Drugs That Built a Super Soldier|url=https://www.theatlantic.com/health/archive/2016/04/the-drugs-that-built-a-super-soldier/477183/|publisher=The Atlantic|accessdate=22 June 2018}}</ref>

== Route of administration ==
Psychoactive drugs are administered via oral [[ingestion]] as a tablet, capsule, powder, liquid, and beverage; via [[injection (medicine)|injection]] by [[subcutaneous injection|subcutaneous]], [[intramuscular]], and [[intravenous]] route; via rectum by suppository and enema; and via inhalation by [[smoking]], [[vaporization]] and [[insufflation]] ("snorting"). The efficiency of each method of administration varies from drug to drug.<ref>United States Food and Drug Administration. [http://www.fda.gov/cder/dsm/DRG/drg00301.htm CDER Data Standards Manual] {{webarchive|url=https://web.archive.org/web/20060103175139/http://www.fda.gov/cder/dsm/DRG/drg00301.htm |date=2006-01-03 }}. Retrieved on May 15, 2007.</ref>

The psychiatric drugs [[fluoxetine]], [[quetiapine]], and [[lorazepam]] are [[ingest]]ed orally in [[Tablet (pharmacy)|tablet]] or [[Capsule (pharmacy)|capsule]] form. [[Grain alcohol|Alcohol]] and [[caffeine]] are ingested in beverage form; [[nicotine]] and [[cannabis (drug)|cannabis]] are smoked or [[Vaporizer (inhalation device)|vaped]]; [[peyote]] and [[psilocybin mushroom]]s are ingested in botanical form or dried; and crystalline drugs such as [[cocaine]] and [[methamphetamines|methamphetamine]] are usually [[Insufflation (medicine)|insufflated]] (inhaled or "snorted").

==Determinants of effects==
The theory of dosage, set, and setting is a useful model in dealing with the effects of psychoactive substances, especially in a controlled therapeutic setting as well as in recreational use. [[Timothy Leary|Dr. Timothy Leary]], based on his own experiences and systematic observations on psychedelics, developed this theory along with his colleagues [[Ralph Metzner]], and [[Richard Alpert]] ([[Ram Dass]]) in the 1960s.<ref>The Psychedelic Experience. New York: University Books. 1964</ref>

;Dosage
The first factor, dosage, has been a truism since ancient times, or at least since [[Paracelsus]] who said, "Dose makes the poison." Some compounds are beneficial or pleasurable when consumed in small amounts, but harmful, deadly, or evoke discomfort in higher doses.

;Set
The set is the internal attitudes and constitution of the person, including their expectations, wishes, fears, and sensitivity to the drug. This factor is especially important for the hallucinogens, which have the ability to make conscious experiences out of the unconscious. In traditional cultures, set is shaped primarily by the worldview, health and genetic characteristics that all the members of the culture share.

;Setting
The third aspect is setting, which pertains to the surroundings, the place, and the time in which the experiences transpire.

This theory clearly states that the effects are equally the result of chemical, pharmacological, psychological, and physical influences. The model that Timothy Leary proposed applied to the psychedelics, although it also applies to other psychoactives.<ref name="Psychoactive Plants pg. 10">{{cite book | title=The Encyclopedia of Psychoactive Plants | publisher=Park Street Press | author=Ratsch, Christian | authorlink=Christian Rätsch| date=May 5, 2005 | page=944 | isbn=0-89281-978-2}}</ref>

== Effects ==
[[File:SynapseSchematic en.svg|thumb|right|300px|Illustration of the major elements of [[neurotransmission]]. Depending on its method of action, a psychoactive substance may block the receptors on the post-synaptic neuron ([[dendrite]]), or block reuptake or affect neurotransmitter synthesis in the pre-synaptic neuron ([[axon]]).]]
{{Main article| Neuropsychopharmacology}}
Psychoactive drugs operate by temporarily affecting a person's neurochemistry, which in turn causes changes in a person's mood, cognition, perception and behavior. There are many ways in which psychoactive drugs can affect the brain. Each drug has a specific action on one or more [[neurotransmitter]] or [[neuroreceptor]] in the brain.

Drugs that increase activity in particular neurotransmitter systems are called [[agonists]]. They act by increasing the [[Chemical synthesis|synthesis]] of one or more neurotransmitters, by reducing its [[reuptake]] from the [[synapses]], or by mimicking the action by binding directly to the postsynaptic receptor. Drugs that reduce neurotransmitter activity are called [[Receptor antagonist|antagonists]], and operate by interfering with synthesis or blocking postsynaptic receptors so that neurotransmitters cannot bind to them.<ref>{{cite book| last = Seligma| first = Martin E.P.| title = Abnormal Psychology| publisher = W. W. Norton & Company|year=1984| isbn = 0-393-94459-X| chapter = 4 }}</ref>

Exposure to a psychoactive substance can cause changes in the structure and functioning of [[neurons]], as the nervous system tries to re-establish the [[homeostasis]] disrupted by the presence of the drug (see also, [[neuroplasticity]]). Exposure to antagonists for a particular neurotransmitter can increase the number of receptors for that neurotransmitter or the receptors themselves may become more responsive to neurotransmitters; this is called [[sensitization]]. Conversely, overstimulation of receptors for a particular neurotransmitter may cause a decrease in both number and sensitivity of these receptors, a process called [[Desensitization (medicine)|desensitization]] or [[Drug tolerance|tolerance]]. Sensitization and desensitization are more likely to occur with long-term exposure, although they may occur after only a single exposure. These processes are thought to play a role in drug dependence and addiction.<ref>{{cite web | title=University of Texas, Addiction Science Research and Education Center | url=http://www.utexas.edu/research/asrec/dopamine.html | accessdate=May 14, 2007 | deadurl=yes | archiveurl=https://www.webcitation.org/618NxQOGJ?url=http://www.utexas.edu/research/asrec/dopamine.html | archivedate=August 22, 2011 | df= }}</ref> [[Physical dependence]] on antidepressants or anxiolytics may result in worse depression or anxiety, respectively, as withdrawal symptoms. Unfortunately, because [[clinical depression]] (also called [[major depressive disorder]]) is often referred to simply as [[Depression (mood)|depression]], antidepressants are often requested by and prescribed for patients who are depressed, but not clinically depressed.

=== Affected neurotransmitter systems ===
The following is a brief table ofientist.com/article.ns?id=mg18725181.700 | accessdate = 2007-11-19 | format = fee required | deadurl = no | archiveurl = https://web.archive.org/web/20071024030810/http://www.newscientist.com/article.ns?id=mg18725181.700 | archivedate = 24 October 2007 | df = }}</ref>


Psychoactive drugs are divided into different groups according to their pharmacological effects. Commonly used psychoactive drugs and groups:
Psychoactive drugs are divided into different groups according to their pharmacological effects. Commonly used psychoactive drugs and groups:
Line 153: Line 48:
::Example: [[MDMA]] (Ecstasy), [[3,4-Methylenedioxyamphetamine|MDA]], [[6-APB]], [[Alpha-Methyltryptamine|AMT]]
::Example: [[MDMA]] (Ecstasy), [[3,4-Methylenedioxyamphetamine|MDA]], [[6-APB]], [[Alpha-Methyltryptamine|AMT]]
* [[Stimulant]]s ("uppers"). This category comprises substances that wake one up, stimulate the mind, and may cause euphoria, but do not affect perception.
* [[Stimulant]]s ("uppers"). This category comprises substances that wake one up, stimulate the mind, and may cause euphoria, but do not affect perception.
::Examples: [[amphetamine]], [[caffeine]], [[cocaipain ne]], [[nicotine]], [[modafinil]]
::Examples: [[amphetamine]], [[caffeine]], [[cocaine]], [[nicotine]], [[modafinil]]
* [[Depressant]]s ("downers"), including [[sedative]]s, [[hypnotic]]s, and [[opioid]]s. This category includes all of the calmative, sleep-inducing, anxiety-reducing, anesthetizing substances, which sometimes induce perceptual changes, such as dream images, and also often evoke feelings of euphoria.
* [[Depressant]]s ("downers"), including [[sedative]]s, [[hypnotic]]s, and [[opioid]]s. This category includes all of the calmative, sleep-inducing, anxiety-reducing, anesthetizing substances, which sometimes induce perceptual changes, such as dream images, and also often evoke feelings of euphoria.
::Examples: [[ethanol]] ([[alcoholic beverage]]s), [[opioid]]s, [[cannabis (drug)|cannabis]], [[barbiturate]]s, [[benzodiazepine]]s.
::Examples: [[ethanol]] ([[alcoholic beverage]]s), [[opioid]]s, [[cannabis (drug)|cannabis]], [[barbiturate]]s, [[benzodiazepine]]s.
* [[Hallucinogen]]s, including [[psychedelics]], pain [[dissociative]]s and [[deliriant]]s. This category encompasses all those substances that produce distinct alterations in perception, sensation of space and time, and emotional states<ref>{{cite journal | author = Bersani FS, Corazza O, Simonato P, Mylokosta A, Levari E, Lovaste R, Schifano F | title = Drops of madness? Recreational misuse of tropicamide collyrium; early warning alerts from Russia and Italy | journal = General Hospital Psychiatry | volume = 35 | issue = 5 | pages = 571–3 | year = 2013 | pmid = 23706777 | doi = 10.1016/j.genhosppsych.2013.04.013 | last2 = Corazza | last3 = Simonato | last4 = Mylokosta | last5 = Levari | last6 = Lovaste | last7 = Schifano }}</ref>
* [[Hallucinogen]]s, including [[psychedelics]], [[dissociative]]s and [[deliriant]]s. This category encompasses all those substances that produce distinct alterations in perception, sensation of space and time, and emotional states<ref>{{cite journal | author = Bersani FS, Corazza O, Simonato P, Mylokosta A, Levari E, Lovaste R, Schifano F | title = Drops of madness? Recreational misuse of tropicamide collyrium; early warning alerts from Russia and Italy | journal = General Hospital Psychiatry | volume = 35 | issue = 5 | pages = 571–3 | year = 2013 | pmid = 23706777 | doi = 10.1016/j.genhosppsych.2013.04.013 | last2 = Corazza | last3 = Simonato | last4 = Mylokosta | last5 = Levari | last6 = Lovaste | last7 = Schifano }}</ref>
::Examples: [[psilocybin]], [[LSD]], ''[[Salvia divinorum]]'', [[nitrous oxide]] and [[scopolamine]].
::Examples: [[psilocybin]], [[LSD]], ''[[Salvia divinorum]]'', [[nitrous oxide]] and [[scopolamine]].


Line 267: Line 162:
|[[Cholinergic]]s (acetylcholine receptor agonists)
|[[Cholinergic]]s (acetylcholine receptor agonists)
|''[[arecoline]], [[nicotine]], [[piracetam]]''
|''[[arecoline]], [[nicotine]], [[piracetam]]''
|-
|[[Muscarinic antagonist]]s (acetylcholine receptor antagonists)notable drugs and their primary neurotransmitter, receptor or method of action. Many drugs act on more than one transmitter or receptor in the brain.<ref>{{cite journal | author = Lüscher C, Ungless MA | title = The mechanistic classification of addictive drugs | journal = PLoS Medicine | volume = 3 | issue = 11 | pages = e437 | year = 2006 | pmid = 17105338 | pmc = 1635740 | doi = 10.1371/journal.pmed.0030437 | last2 = Ungless }}</ref>

{| class="wikitable"
|-
!Neurotransmitter/receptor
!Classification
!''Examples''
|-
|rowspan=3|<center>[[File:Acetylcholine.svg|150px]]</center><br /><center>[[Acetylcholine]]</center>
|[[Cholinergic]]s (acetylcholine receptor agonists)
|''[[arecoline]], [[nicotientist.com/article.ns?id=mg18725181.700 | accessdate = 2007-11-19 | format = fee required | deadurl = no | archiveurl = https://web.archive.org/web/20071024030810/http://www.newscientist.com/article.ns?id=mg18725181.700 | archivedate = 24 October 2007 | df = }}</ref>

Psychoactive drugs are divided into different groups according to their pharmacological effects. Commonly used psychoactive drugs and groups:
* [[Anxiolytics]]
::Example: [[benzodiazepine]]s, [[barbiturate]]s
* [[Empathogen–entactogen]]s
::Example: [[MDMA]] (Ecstasy), [[3,4-Methylenedioxyamphetamine|MDA]], [[6-APB]], [[Alpha-Methyltryptamine|AMT]]
* [[Stimulant]]s ("uppers"). This category comprises substances that wake one up, stimulate the mind, and may cause euphoria, but do not affect perception.
::Examples: [[amphetamine]], [[caffeine]], [[cocaipain ne]], [[nicotine]], [[modafinil]]
* [[Depressant]]s ("downers"), including [[sedative]]s, [[hypnotic]]s, and [[opioid]]s. This category includes all of the calmative, sleep-inducing, anxiety-reducing, anesthetizing substances, which sometimes induce perceptual changes, such as dream images, and also often evoke feelings of euphoria.
::Examples: [[ethanol]] ([[alcoholic beverage]]s), [[opioid]]s, [[cannabis (drug)|cannabis]], [[barbiturate]]s, [[benzodiazepine]]s.
* [[Hallucinogen]]s, including [[psychedelics]], pain [[dissociative]]s and [[deliriant]]s. This category encompasses all those substances that produce distinct alterations in perception, sensation of space and time, and emotional states<ref>{{cite journal | author = Bersani FS, Corazza O, Simonato P, Mylokosta A, Levari E, Lovaste R, Schifano F | title = Drops of madness? Recreational misuse of tropicamide collyrium; early warning alerts from Russia and Italy | journal = General Hospital Psychiatry | volume = 35 | issue = 5 | pages = 571–3 | year = 2013 | pmid = 23706777 | doi = 10.1016/j.genhosppsych.2013.04.013 | last2 = Corazza | last3 = Simonato | last4 = Mylokosta | last5 = Levari | last6 = Lovaste | last7 = Schifano }}</ref>
::Examples: [[psilocybin]], [[LSD]], ''[[Salvia divinorum]]'', [[nitrous oxide]] and [[scopolamine]].

==Uses==

=== Anesthesia ===
{{Main article| Anesthesia}}
[[General anaesthetic|General anesthetics]] are a class of psychoactive drug used on people to block physical pain and other sensations. Most anesthetics induce unconsciousness, allowing the person to undergo medical procedures like [[surgery]] without the feelings of [[physical pain]] or [[emotional trauma]].<ref>Medline Plus. [https://www.nlm.nih.gov/medlineplus/anesthesia.html Anesthesia.] {{webarchive|url=https://web.archive.org/web/20160704221735/https://www.nlm.nih.gov/medlineplus/anesthesia.html |date=2016-07-04 }} Accessed on July 16, 2007.</ref> To induce unconsciousness, anesthetics affect the [[GABA]] and [[NMDA]] systems. For example, [[propofol]] is a GABA agonist,<ref>{{cite journal | author = Li X, Pearce RA | title = Effects of halothane on GABA(A) receptor kinetics: evidence for slowed agonist unbinding | journal = The Journal of Neuroscience | volume = 20 | issue = 3 | pages = 899–907 | year = 2000 | pmid = 10648694 | doi = | last2 = Pearce }}</ref> and [[ketamine]] is an [[NMDA receptor antagonist]].<ref>{{cite journal | author = Harrison NL, Simmonds MA | title = Quantitative studies on some antagonists of N-methyl D-aspartate in slices of rat cerebral cortex | journal = British Journal of Pharmacology | volume = 84 | issue = 2 | pages = 381–91 | year = 1985 | pmid = 2858237 | pmc = 1987274 | doi = 10.1111/j.1476-5381.1985.tb12922.x | last2 = Simmonds }}</ref>

=== Pain management ===
{{Main article| Analgesics}}
Psychoactive drugs are often prescribed to [[pain management|manage pain]]. The subjective experience of pain is primarily regulated by [[endogenous]] [[opioid|opioid peptides]]. Thus, pain can often be managed using psychoactives that operate on this neurotransmitter system, also known as [[opioid receptor agonist]]s. This class of drugs can be highly addictive, and includes [[opiate]] [[narcotics]], like [[morphine]] and [[codeine]].<ref>{{cite journal | author = Quiding H, Lundqvist G, Boréus LO, Bondesson U, Ohrvik J | title = Analgesic effect and plasma concentrations of codeine and morphine after two dose levels of codeine following oral surgery | journal = European Journal of Clinical Pharmacology | volume = 44 | issue = 4 | pages = 319–23 | year = 1993 | pmid = 8513842 | doi = 10.1007/BF00316466 | last2 = Lundqvist | last3 = Boréus | last4 = Bondesson | last5 = Ohrvik }}</ref> [[NSAID]]s, such as [[aspirin]] and [[ibuprofen]], are also analgesics. These agents also reduce [[eicosanoid]]-mediated [[inflammation]] by inhibiting the enzyme [[cyclooxygenase]].

=== Mental disorders ===
{{Main article| Psychiatric medications}}
[[File:Zoloft bottles.jpg|thumb|250px|Zoloft ([[sertraline]]) is an [[SSRI]] [[antidepressant]].]]

Psychiatric medications are psychoactive drugs prescribed for the management of [[mental disorders|mental and emotional disorders]], or to aid in overcoming [[challenging behavior]].<ref>{{cite journal |last1=Matson |first1=Johnny L. |last2=Neal |first2=Daniene |title=Psychotropic medication use for challenging behaviors in persons with intellectual disabilities: An overview |journal=Research in Developmental Disabilities |volume=30 |issue=3 |pages=572–86 |year=2009 |pmid=18845418 |doi=10.1016/j.ridd.2008.08.007 }}</ref> There are six major classes of psychiatric medications:
* [[Antidepressants]] treat disorders such as [[clinical depression]], [[dysthymia]], [[anxiety]], [[eating disorders]] and [[borderline personality disorder]].<ref>{{cite journal | author = Schatzberg AF | title = New indications for antidepressants | journal = The Journal of Clinical Psychiatry | volume = 61 | issue = 11 | pages = 9–17 | year = 2000 | pmid = 10926050 }}</ref>
* [[Stimulants]], used to treat disorders such as [[attention deficit hyperactivity disorder]] and [[narcolepsy]], and for [[Anorectic|weight reduction]].
* [[Antipsychotics]], used to treat [[psychosis|psychotic symptoms]], such as those associated with [[schizophrenia]] or severe [[mania]], or as adjuncts to relieve clinical depression.
* [[Mood stabilizers]], used to treat [[bipolar disorder]] and [[schizoaffective disorder]].
* [[Anxiolytics]], used to treat [[anxiety disorder]]s.
* [[Depressants]], used as [[hypnotics]], [[sedative]]s, and [[anesthetic]]s, depending upon dosage.

In addition, several psychoactive substances are currently employed to treat various addictions. These include [[acamprosate]] or [[naltrexone]] in the treatment of alcoholism, or [[methadone]] or [[buprenorphine]] [[Opioid replacement therapy|maintenance therapy]] in the case of [[opioid addiction]].<ref>{{Cite book|url=https://books.google.com/books?id=_MySDAAAQBAJ&pg=PA606|title=The Oxford Handbook of Substance Use and Substance Use Disorders|last=|first=|vauthors=Swift RM|publisher=Oxford University Press|year=2016|isbn=9780199381708|veditors=Sher KJ|location=|pages=601–603, 606|language=en|chapter=Pharmacotherapy of Substance Use, Craving, and Acute Abstinence Syndromes|deadurl=no|archiveurl=https://web.archive.org/web/20180509181047/https://books.google.com/books?id=_MySDAAAQBAJ&pg=PA606|archivedate=2018-05-09|df=}}</ref>

Exposure to psychoactive drugs can cause [[neuroplasticity|changes to the brain]] that counteract or augment some of their effects; these changes may be beneficial or harmful. However, there is a significant amount of evidence that relapse rate of mental disorders negatively corresponds with length of properly followed treatment regimens (that is, relapse rate substantially declines over time), and to a much greater degree than placebo.<ref>{{cite journal |doi=10.1192/bjp.179.42.s4 |pmid=11532820 |title=Clinical importance of long-term antidepressant treatment |journal=The British Journal of Psychiatry |volume=179 |issue=42 |pages=S4–8 |year=2001 |last1=Hirschfeld |first1=Robert M. A. }}</ref>

===Recreation===
{{Main article| Recreational drug use}}

Many psychoactive substances are used for their mood and perception altering effects, including those with accepted uses in medicine and psychiatry. Examples of psychoactive substances include [[caffeine]], [[Alcoholic beverage|alcohol]], [[cocaine]], [[lysergic acid diethylamide|LSD]], [[nicotine]] and [[cannabis (drug)|cannabis]].<ref name="who">[http://www.who.int/substance_abuse/publications/en/Neuroscience_E.pdf Neuroscience of Psychoactive Substance Use and Dependence] {{webarchive|url=https://web.archive.org/web/20061003085309/http://www.who.int/substance_abuse/publications/en/Neuroscience_E.pdf |date=2006-10-03 }} by the [[World Health Organization]]. Retrieved 5 July 2007.</ref> Classes of drugs frequently used recreationally include:
* [[Stimulants]], which activate the [[central nervous system]]. These are used recreationally for their [[Euphoria (emotion)|euphoric]] effects.
* [[Hallucinogens]] ([[psychedelics]], [[dissociatives]] and [[deliriants]]), which induce perceptual and cognitive alterations.
* [[Hypnotics]], which depress the central nervous system.
* [[Opioid|Opioid analgesics]], which also depress the central nervous system. These are used recreationally because of their euphoric effects.
* [[Inhalant]]s, in the forms of gas aerosols, or solvents, which are inhaled as a vapor because of their stupefying effects. Many inhalants also fall into the above categories (such as [[nitrous oxide]] which is also an analgesic).

In some modern and ancient cultures, drug usage is seen as a [[Social status|status]] symbol. Recreational drugs are seen as status symbols in settings such as at [[nightclub]]s and parties.<ref>{{cite journal | author = Anderson TL | title = Drug identity change processes, race, and gender. III. Macrolevel opportunity concepts | journal = Substance Use & Misuse | volume = 33 | issue = 14 | pages = 2721–35 | year = 1998 | pmid = 9869440 | doi = 10.3109/10826089809059347 }}</ref> For example, in [[ancient Egypt]], gods were commonly pictured holding hallucinogenic plants.<ref>{{cite journal | author = Bertol E, Fineschi V, Karch SB, Mari F, Riezzo I | title = Nymphaea cults in ancient Egypt and the New World: a lesson in empirical pharmacology | journal = Journal of the Royal Society of Medicine | volume = 97 | issue = 2 | pages = 84–5 | year = 2004 | pmid = 14749409 | pmc = 1079300 | doi = 10.1177/014107680409700214 | last2 = Fineschi | last3 = Karch | last4 = Mari | last5 = Riezzo }}</ref>

Because there is controversy about regulation of recreational drugs, there is an [[arguments for and against drug prohibition|ongoing debate about drug prohibition]]. Critics of prohibition believe that regulation of recreational drug use is a violation of personal autonomy and [[liberty|freedom]].<ref>{{cite journal | author = Hayry M | title = Prescribing cannabis: freedom, autonomy, and values | journal = Journal of Medical Ethics | volume = 30 | issue = 4 | pages = 333–6 | year = 2004 | pmid = 15289511 | pmc = 1733898 | doi = 10.1136/jme.2002.001347 }}</ref> In the United States, critics have noted that prohibition or regulation of recreational and spiritual drug use might be [[unconstitutional]], and causing more harm than is prevented.<ref>Barnett, Randy E. [http://law.wustl.edu/Journal/22/p29Barnett.pdf "The Presumption of Liberty and the Public Interest: Medical Marijuana and Fundamental Rights"] {{webarchive|url=https://web.archive.org/web/20070711001509/http://law.wustl.edu/Journal/22/p29Barnett.pdf |date=2007-07-11 }}. Retrieved 4 July 2007.</ref>

===Ritual and spiritual===
[[File:Timothy-Leary-Los-Angeles-1989.jpg|thumb|upright|[[Timothy Leary]] was a leading proponent of spiritual hallucinogen use.]]
{{Main article| Entheogens}}
Certain psychoactives, particularly hallucinogens, have been used for religious purposes since prehistoric times. Native Americans have used [[peyote]] cacti containing [[mescaline]] for religious ceremonies for as long as 5700 years.<ref>{{cite journal | author = El-Seedi HR, De Smet PA, Beck O, Possnert G, Bruhn JG | title = Prehistoric peyote use: alkaloid analysis and radiocarbon dating of archaeological specimens of Lophophora from Texas | journal = Journal of Ethnopharmacology | volume = 101 | issue = 1–3 | pages = 238–42 | year = 2005 | pmid = 15990261 | doi = 10.1016/j.jep.2005.04.022 | last2 = De Smet | last3 = Beck | last4 = Possnert | last5 = Bruhn }}</ref> The [[muscimol]]-containing [[Amanita muscaria]] mushroom was used for ritual purposes throughout prehistoric Europe.<ref>{{cite journal | author = Vetulani J | title = Drug addiction. Part I. Psychoactive substances in the past and presence | journal = Polish Journal of Pharmacology | volume = 53 | issue = 3 | pages = 201–14 | year = 2001 | pmid = 11785921 | doi = }}</ref>

The use of entheogens for religious purposes resurfaced in the West during the [[Counterculture of the 1960s|counterculture movements]] of the 1960s and 70s. Under the leadership of [[Timothy Leary]], new spiritual and intention-based movements began to use [[LSD]] and other hallucinogens as tools to access deeper inner exploration. In the United States, the use of peyote for ritual purposes is protected only for members of the [[Native American Church]], which is allowed to cultivate and distribute [[peyote]]. However, the genuine religious use of peyote, regardless of one's personal ancestry, is protected in Colorado, Arizona, New Mexico, Nevada, and Oregon.<ref>{{cite journal | author = Bullis RK | title = Swallowing the scroll: legal implications of the recent Supreme Court peyote cases | journal = Journal of Psychoactive Drugs | volume = 22 | issue = 3 | pages = 325–32 | year = 1990 | pmid = 2286866 | doi = 10.1080/02791072.1990.10472556}}</ref>

=== Military ===
{{Main article|Psychochemical warfare|List of drugs used by militaries}}
Psychoactive drugs have been used in military applications as [[non-lethal weapon]]s.

Both military and civilian American intelligence officials are known to have used psychoactive drugs while interrogating captives apprehended in its [[War on Terror]]. In July 2012, [[Jason Leopold]] and Jeffrey Kaye, psychologists and human rights workers, had a [[Freedom of Information Act]] request fulfilled that confirmed that the use of psychoactive drugs during interrogation was a long-standing
practice.<ref name=Truthout2012-07-11>
{{cite news| url = http://truth-out.org/news/item/10248-exclusive-department-of-defense-declassifies-report-on-alleged-drugging-of-detainees| title = EXCLUSIVE: DoD Report Reveals Some Detainees Interrogated While Drugged, Others "Chemically Restrained"| publisher = [[Truthout]]|author1=Jason Leopold |author2=Jeffrey Kaye | date = 2011-07-11| archivedate = 2012-07-14| archiveurl = https://www.webcitation.org/query?url=http%3A%2F%2Ftruth-out.org%2Fnews%2Fitem%2F10248-exclusive-department-of-defense-declassifies-report-on-alleged-drugging-of-detainees&date=2012-07-14| deadurl = no| quote = Truthout obtained a copy of the report – "Investigation of Allegations of the Use of Mind-Altering Drugs to Facilitate Interrogations of Detainees" – prepared by the DoD's deputy inspector general for intelligence in September 2009, under a Freedom of Information Act (FOIA) request we filed nearly two years ago.}}
</ref><ref name=Wired2012-07-11>
{{cite news| url = https://www.wired.com/dangerroom/2012/07/gitmo/| title = U.S. Injected Gitmo Detainees With 'Mind Altering' Drugs| publisher = [[Wired magazine]]| author = Robert Beckhusen| date = 2012-07-11| page = | accessdate = 2012-07-14| archivedate = 2012-07-14| archiveurl = https://www.webcitation.org/query?url=http%3A%2F%2Fwww.wired.com%2Fdangerroom%2F2012%2F07%2Fgitmo%2F&date=2012-07-14| deadurl = no| quote = That's according to a recently declassified report (.pdf) from the Pentagon's inspector general, obtained by Truthout's Jeffrey Kaye and Jason Leopold after a Freedom of Information Act Request. In it, the inspector general concludes that "certain detainees, diagnosed as having serious mental health conditions being treated with psychoactive medications on a continuing basis, were interrogated." The report does not conclude, though, that anti-psychotic drugs were used specifically for interrogation purposes.}}
</ref>
Captives and former captives had been reporting medical staff collaborating with interrogators to drug captives with powerful psychoactive drugs prior to interrogation since the very first captives' release.<ref name=Bbc2003-05-23>
{{cite news| url=http://news.bbc.co.uk/2/hi/south_asia/3051501.stm| title=Pakistani relives Guantanamo ordeal| publisher=BBC News| author=Haroon Rashid| date=2003-05-23| accessdate=2009-01-09| archivedate = 2012-07-14| archiveurl = https://www.webcitation.org/query?url=http%3A%2F%2Fnews.bbc.co.uk%2F2%2Fhi%2Fsouth_asia%2F3051501.stm&date=2012-07-14| deadurl = no| quote = Mr Shah alleged that the Americans had given him injections and tablets prior to interrogations. "They used to tell me I was mad," the 23-year-old told the BBC in his native village in Dir district near the Afghan border. I was given injections at least four or five times as well as different tablets. I don't know what they were meant for."}}
</ref><ref name=Guardian2003-12-03>
{{cite news| url = https://www.theguardian.com/guantanamo/story/0,13743,1098604,00.html| title = People the law forgot| publisher = The Guardian| date = 2003-12-03| page = | accessdate = 2012-07-14| archivedate = 2012-07-14| archiveurl = https://www.webcitation.org/query?url=http%3A%2F%2Fwww.guardian.co.uk%2Fworld%2F2003%2Fdec%2F03%2Fguantanamo.usa1&date=2012-07-14| deadurl = no| quote = The biggest damage is to my brain. My physical and mental state isn't right. I'm a changed person. I don't laugh or enjoy myself much.| location=London| first=James| last=Meek}}
</ref>
In May 2003, recently released [[Pakistani captives in Guantanamo|Pakistani captive]] [[Sha Mohammed Alikhel]] described the routine use of psychoactive drugs in the [[Guantanamo Bay detention center]]. He said that [[Jihan Wali]], a captive kept in a nearby cell, was rendered catatonic through the use of these drugs.

The military justice system has also been known to use psychoactive drugs to obtain a conviction. (U.S. vs. Juillerat)<ref>ACM 34205, afcca.law.af.mil</ref>

Additionally, militaries worldwide have used or are using various psychoactive drugs to [[Performance-enhancing substance|improve performance]] of soldiers by suppressing hunger, increasing the ability to sustain effort without food, increasing and lengthening [[wakefulness]] and concentration, suppressing [[fear]], reducing empathy, and improving reflexes and memory-recall among other things.<ref name="Stoker2013">{{cite web |last1=Stoker |first1=Liam |title=Analysis Creating Supermen: battlefield performance enhancing drugs |url=https://www.army-technology.com/features/featurecreating-supermen-battlefield-performance-enhancing-drugs/ |website=Army Technology |publisher=[[Verdict Media Limited]] |accessdate=22 June 2018 |date=14 April 2013}}</ref><ref>{{cite web|last1=Kamienski|first1=Lukasz|title=The Drugs That Built a Super Soldier|url=https://www.theatlantic.com/health/archive/2016/04/the-drugs-that-built-a-super-soldier/477183/|publisher=The Atlantic|accessdate=22 June 2018}}</ref>

== Route of administration ==
Psychoactive drugs are administered via oral [[ingestion]] as a tablet, capsule, powder, liquid, and beverage; via [[injection (medicine)|injection]] by [[subcutaneous injection|subcutaneous]], [[intramuscular]], and [[intravenous]] route; via rectum by suppository and enema; and via inhalation by [[smoking]], [[vaporization]] and [[insufflation]] ("snorting"). The efficiency of each method of administration varies from drug to drug.<ref>United States Food and Drug Administration. [http://www.fda.gov/cder/dsm/DRG/drg00301.htm CDER Data Standards Manual] {{webarchive|url=https://web.archive.org/web/20060103175139/http://www.fda.gov/cder/dsm/DRG/drg00301.htm |date=2006-01-03 }}. Retrieved on May 15, 2007.</ref>

The psychiatric drugs [[fluoxetine]], [[quetiapine]], and [[lorazepam]] are [[ingest]]ed orally in [[Tablet (pharmacy)|tablet]] or [[Capsule (pharmacy)|capsule]] form. [[Grain alcohol|Alcohol]] and [[caffeine]] are ingested in beverage form; [[nicotine]] and [[cannabis (drug)|cannabis]] are smoked or [[Vaporizer (inhalation device)|vaped]]; [[peyote]] and [[psilocybin mushroom]]s are ingested in botanical form or dried; and crystalline drugs such as [[cocaine]] and [[methamphetamines|methamphetamine]] are usually [[Insufflation (medicine)|insufflated]] (inhaled or "snorted").

==Determinants of effects==
The theory of dosage, set, and setting is a useful model in dealing with the effects of psychoactive substances, especially in a controlled therapeutic setting as well as in recreational use. [[Timothy Leary|Dr. Timothy Leary]], based on his own experiences and systematic observations on psychedelics, developed this theory along with his colleagues [[Ralph Metzner]], and [[Richard Alpert]] ([[Ram Dass]]) in the 1960s.<ref>The Psychedelic Experience. New York: University Books. 1964</ref>

;Dosage
The first factor, dosage, has been a truism since ancient times, or at least since [[Paracelsus]] who said, "Dose makes the poison." Some compounds are beneficial or pleasurable when consumed in small amounts, but harmful, deadly, or evoke discomfort in higher doses.

;Set
The set is the internal attitudes and constitution of the person, including their expectations, wishes, fears, and sensitivity to the drug. This factor is especially important for the hallucinogens, which have the ability to make conscious experiences out of the unconscious. In traditional cultures, set is shaped primarily by the worldview, health and genetic characteristics that all the members of the culture share.

;Setting
The third aspect is setting, which pertains to the surroundings, the place, and the time in which the experiences transpire.

This theory clearly states that the effects are equally the result of chemical, pharmacological, psychological, and physical influences. The model that Timothy Leary proposed applied to the psychedelics, although it also applies to other psychoactives.<ref name="Psychoactive Plants pg. 10">{{cite book | title=The Encyclopedia of Psychoactive Plants | publisher=Park Street Press | author=Ratsch, Christian | authorlink=Christian Rätsch| date=May 5, 2005 | page=944 | isbn=0-89281-978-2}}</ref>

== Effects ==
[[File:SynapseSchematic en.svg|thumb|right|300px|Illustration of the major elements of [[neurotransmission]]. Depending on its method of action, a psychoactive substance may block the receptors on the post-synaptic neuron ([[dendrite]]), or block reuptake or affect neurotransmitter synthesis in the pre-synaptic neuron ([[axon]]).]]
{{Main article| Neuropsychopharmacology}}
Psychoactive drugs operate by temporarily affecting a person's neurochemistry, which in turn causes changes in a person's mood, cognition, perception and behavior. There are many ways in which psychoactive drugs can affect the brain. Each drug has a specific action on one or more [[neurotransmitter]] or [[neuroreceptor]] in the brain.

Drugs that increase activity in particular neurotransmitter systems are called [[agonists]]. They act by increasing the [[Chemical synthesis|synthesis]] of one or more neurotransmitters, by reducing its [[reuptake]] from the [[synapses]], or by mimicking the action by binding directly to the postsynaptic receptor. Drugs that reduce neurotransmitter activity are called [[Receptor antagonist|antagonists]], and operate by interfering with synthesis or blocking postsynaptic receptors so that neurotransmitters cannot bind to them.<ref>{{cite book| last = Seligma| first = Martin E.P.| title = Abnormal Psychology| publisher = W. W. Norton & Company|year=1984| isbn = 0-393-94459-X| chapter = 4 }}</ref>

Exposure to a psychoactive substance can cause changes in the structure and functioning of [[neurons]], as the nervous system tries to re-establish the [[homeostasis]] disrupted by the presence of the drug (see also, [[neuroplasticity]]). Exposure to antagonists for a particular neurotransmitter can increase the number of receptors for that neurotransmitter or the receptors themselves may become more responsive to neurotransmitters; this is called [[sensitization]]. Conversely, overstimulation of receptors for a particular neurotransmitter may cause a decrease in both number and sensitivity of these receptors, a process called [[Desensitization (medicine)|desensitization]] or [[Drug tolerance|tolerance]]. Sensitization and desensitization are more likely to occur with long-term exposure, although they may occur after only a single exposure. These processes are thought to play a role in drug dependence and addiction.<ref>{{cite web | title=University of Texas, Addiction Science Research and Education Center | url=http://www.utexas.edu/research/asrec/dopamine.html | accessdate=May 14, 2007 | deadurl=yes | archiveurl=https://www.webcitation.org/618NxQOGJ?url=http://www.utexas.edu/research/asrec/dopamine.html | archivedate=August 22, 2011 | df= }}</ref> [[Physical dependence]] on antidepressants or anxiolytics may result in worse depression or anxiety, respectively, as withdrawal symptoms. Unfortunately, because [[clinical depression]] (also called [[major depressive disorder]]) is often referred to simply as [[Depression (mood)|depression]], antidepressants are often requested by and prescribed for patients who are depressed, but not clinically depressed.

=== Affected neurotransmitter systems ===
The following is a brief table of notable drugs and their primary neurotransmitter, receptor or method of action. Many drugs act on more than one transmitter or receptor in the brain.<ref>{{cite journal | author = Lüscher C, Ungless MA | title = The mechanistic classification of addictive drugs | journal = PLoS Medicine | volume = 3 | issue = 11 | pages = e437 | year = 2006 | pmid = 17105338 | pmc = 1635740 | doi = 10.1371/journal.pmed.0030437 | last2 = Ungless }}</ref>

{| class="wikitable"
|-
!Neurotransmitter/receptor
!Classification
!''Examples''
|-
|rowspan=3|<center>[[File:Acetylcholine.svg|150px]]</center><br /><center>[[Acetylcholine]]</center>
|[[Cholinergic]]s (acetylcholine receptor agonists)
|''[[arecoline]], [[nicotine]], [[piracetam]]''
|-
|[[Muscarinic antagonist]]s (acetylcholine receptor antagonists)ine]], [[piracetam]]''
|-
|-
|[[Muscarinic antagonist]]s (acetylcholine receptor antagonists)
|[[Muscarinic antagonist]]s (acetylcholine receptor antagonists)
Line 414: Line 174:
|-
|-
|rowspan=5|<center>[[File:Dopamine2.svg|150px]]</center><br /><center>[[Dopamine]]
|rowspan=5|<center>[[File:Dopamine2.svg|150px]]</center><br /><center>[[Dopamine]]
|[[Dopamine]] reuptake inhibitors (DRIs)
|[[Dopamine]] reuptake inhibientist.com/article.ns?id=mg18725181.700 | accessdate = 2007-11-19 | format = fee required | deadurl = no | archiveurl = https://web.archive.org/web/20071024030810/http://www.newscientist.com/article.ns?id=mg18725181.700 | archivedate = 24 October 2007 | df = }}</ref>
|''[[cocaine]]'', ''[[bupropion]]'', ''[[methylphenidate]]'', [[St John's wort]], and certain [[TAAR1 agonist]]s like ''[[amphetamine]], [[phenethylamine]], and [[methamphetamine]]''

Psychoactive drugs are divided into different groups according to their pharmacological effects. Commonly used psychoactive drugs and groups:
* [[Anxiolytics]]
::Example: [[benzodiazepine]]s, [[barbiturate]]s
* [[Empathogen–entactogen]]s
::Example: [[MDMA]] (Ecstasy), [[3,4-Methylenedioxyamphetamine|MDA]], [[6-APB]], [[Alpha-Methyltryptamine|AMT]]
* [[Stimulant]]s ("uppers"). This category comprises substances that wake one up, stimulate the mind, and may cause euphoria, but do not affect perception.
::Examples: [[amphetamine]], [[caffeine]], [[cocaipain ne]], [[nicotine]], [[modafinil]]
* [[Depressant]]s ("downers"), including [[sedative]]s, [[hypnotic]]s, and [[opioid]]s. This category includes all of the calmative, sleep-inducing, anxiety-reducing, anesthetizing substances, which sometimes induce perceptual changes, such as dream images, and also often evoke feelings of euphoria.
::Examples: [[ethanol]] ([[alcoholic beverage]]s), [[opioid]]s, [[cannabis (drug)|cannabis]], [[barbiturate]]s, [[benzodiazepine]]s.
* [[Hallucinogen]]s, including [[psychedelics]], pain [[dissociative]]s and [[deliriant]]s. This category encompasses all those substances that produce distinct alterations in perception, sensation of space and time, and emotional states<ref>{{cite journal | author = Bersani FS, Corazza O, Simonato P, Mylokosta A, Levari E, Lovaste R, Schifano F | title = Drops of madness? Recreational misuse of tropicamide collyrium; early warning alerts from Russia and Italy | journal = General Hospital Psychiatry | volume = 35 | issue = 5 | pages = 571–3 | year = 2013 | pmid = 23706777 | doi = 10.1016/j.genhosppsych.2013.04.013 | last2 = Corazza | last3 = Simonato | last4 = Mylokosta | last5 = Levari | last6 = Lovaste | last7 = Schifano }}</ref>
::Examples: [[psilocybin]], [[LSD]], ''[[Salvia divinorum]]'', [[nitrous oxide]] and [[scopolamine]].

==Uses==

=== Anesthesia ===
{{Main article| Anesthesia}}
[[General anaesthetic|General anesthetics]] are a class of psychoactive drug used on people to block physical pain and other sensations. Most anesthetics induce unconsciousness, allowing the person to undergo medical procedures like [[surgery]] without the feelings of [[physical pain]] or [[emotional trauma]].<ref>Medline Plus. [https://www.nlm.nih.gov/medlineplus/anesthesia.html Anesthesia.] {{webarchive|url=https://web.archive.org/web/20160704221735/https://www.nlm.nih.gov/medlineplus/anesthesia.html |date=2016-07-04 }} Accessed on July 16, 2007.</ref> To induce unconsciousness, anesthetics affect the [[GABA]] and [[NMDA]] systems. For example, [[propofol]] is a GABA agonist,<ref>{{cite journal | author = Li X, Pearce RA | title = Effects of halothane on GABA(A) receptor kinetics: evidence for slowed agonist unbinding | journal = The Journal of Neuroscience | volume = 20 | issue = 3 | pages = 899–907 | year = 2000 | pmid = 10648694 | doi = | last2 = Pearce }}</ref> and [[ketamine]] is an [[NMDA receptor antagonist]].<ref>{{cite journal | author = Harrison NL, Simmonds MA | title = Quantitative studies on some antagonists of N-methyl D-aspartate in slices of rat cerebral cortex | journal = British Journal of Pharmacology | volume = 84 | issue = 2 | pages = 381–91 | year = 1985 | pmid = 2858237 | pmc = 1987274 | doi = 10.1111/j.1476-5381.1985.tb12922.x | last2 = Simmonds }}</ref>

=== Pain management ===
{{Main article| Analgesics}}
Psychoactive drugs are often prescribed to [[pain management|manage pain]]. The subjective experience of pain is primarily regulated by [[endogenous]] [[opioid|opioid peptides]]. Thus, pain can often be managed using psychoactives that operate on this neurotransmitter system, also known as [[opioid receptor agonist]]s. This class of drugs can be highly addictive, and includes [[opiate]] [[narcotics]], like [[morphine]] and [[codeine]].<ref>{{cite journal | author = Quiding H, Lundqvist G, Boréus LO, Bondesson U, Ohrvik J | title = Analgesic effect and plasma concentrations of codeine and morphine after two dose levels of codeine following oral surgery | journal = European Journal of Clinical Pharmacology | volume = 44 | issue = 4 | pages = 319–23 | year = 1993 | pmid = 8513842 | doi = 10.1007/BF00316466 | last2 = Lundqvist | last3 = Boréus | last4 = Bondesson | last5 = Ohrvik }}</ref> [[NSAID]]s, such as [[aspirin]] and [[ibuprofen]], are also analgesics. These agents also reduce [[eicosanoid]]-mediated [[inflammation]] by inhibiting the enzyme [[cyclooxygenase]].

=== Mental disorders ===
{{Main article| Psychiatric medications}}
[[File:Zoloft bottles.jpg|thumb|250px|Zoloft ([[sertraline]]) is an [[SSRI]] [[antidepressant]].]]

Psychiatric medications are psychoactive drugs prescribed for the management of [[mental disorders|mental and emotional disorders]], or to aid in overcoming [[challenging behavior]].<ref>{{cite journal |last1=Matson |first1=Johnny L. |last2=Neal |first2=Daniene |title=Psychotropic medication use for challenging behaviors in persons with intellectual disabilities: An overview |journal=Research in Developmental Disabilities |volume=30 |issue=3 |pages=572–86 |year=2009 |pmid=18845418 |doi=10.1016/j.ridd.2008.08.007 }}</ref> There are six major classes of psychiatric medications:
* [[Antidepressants]] treat disorders such as [[clinical depression]], [[dysthymia]], [[anxiety]], [[eating disorders]] and [[borderline personality disorder]].<ref>{{cite journal | author = Schatzberg AF | title = New indications for antidepressants | journal = The Journal of Clinical Psychiatry | volume = 61 | issue = 11 | pages = 9–17 | year = 2000 | pmid = 10926050 }}</ref>
* [[Stimulants]], used to treat disorders such as [[attention deficit hyperactivity disorder]] and [[narcolepsy]], and for [[Anorectic|weight reduction]].
* [[Antipsychotics]], used to treat [[psychosis|psychotic symptoms]], such as those associated with [[schizophrenia]] or severe [[mania]], or as adjuncts to relieve clinical depression.
* [[Mood stabilizers]], used to treat [[bipolar disorder]] and [[schizoaffective disorder]].
* [[Anxiolytics]], used to treat [[anxiety disorder]]s.
* [[Depressants]], used as [[hypnotics]], [[sedative]]s, and [[anesthetic]]s, depending upon dosage.

In addition, several psychoactive substances are currently employed to treat various addictions. These include [[acamprosate]] or [[naltrexone]] in the treatment of alcoholism, or [[methadone]] or [[buprenorphine]] [[Opioid replacement therapy|maintenance therapy]] in the case of [[opioid addiction]].<ref>{{Cite book|url=https://books.google.com/books?id=_MySDAAAQBAJ&pg=PA606|title=The Oxford Handbook of Substance Use and Substance Use Disorders|last=|first=|vauthors=Swift RM|publisher=Oxford University Press|year=2016|isbn=9780199381708|veditors=Sher KJ|location=|pages=601–603, 606|language=en|chapter=Pharmacotherapy of Substance Use, Craving, and Acute Abstinence Syndromes|deadurl=no|archiveurl=https://web.archive.org/web/20180509181047/https://books.google.com/books?id=_MySDAAAQBAJ&pg=PA606|archivedate=2018-05-09|df=}}</ref>

Exposure to psychoactive drugs can cause [[neuroplasticity|changes to the brain]] that counteract or augment some of their effects; these changes may be beneficial or harmful. However, there is a significant amount of evidence that relapse rate of mental disorders negatively corresponds with length of properly followed treatment regimens (that is, relapse rate substantially declines over time), and to a much greater degree than placebo.<ref>{{cite journal |doi=10.1192/bjp.179.42.s4 |pmid=11532820 |title=Clinical importance of long-term antidepressant treatment |journal=The British Journal of Psychiatry |volume=179 |issue=42 |pages=S4–8 |year=2001 |last1=Hirschfeld |first1=Robert M. A. }}</ref>

===Recreation===
{{Main article| Recreational drug use}}

Many psychoactive substances are used for their mood and perception altering effects, including those with accepted uses in medicine and psychiatry. Examples of psychoactive substances include [[caffeine]], [[Alcoholic beverage|alcohol]], [[cocaine]], [[lysergic acid diethylamide|LSD]], [[nicotine]] and [[cannabis (drug)|cannabis]].<ref name="who">[http://www.who.int/substance_abuse/publications/en/Neuroscience_E.pdf Neuroscience of Psychoactive Substance Use and Dependence] {{webarchive|url=https://web.archive.org/web/20061003085309/http://www.who.int/substance_abuse/publications/en/Neuroscience_E.pdf |date=2006-10-03 }} by the [[World Health Organization]]. Retrieved 5 July 2007.</ref> Classes of drugs frequently used recreationally include:
* [[Stimulants]], which activate the [[central nervous system]]. These are used recreationally for their [[Euphoria (emotion)|euphoric]] effects.
* [[Hallucinogens]] ([[psychedelics]], [[dissociatives]] and [[deliriants]]), which induce perceptual and cognitive alterations.
* [[Hypnotics]], which depress the central nervous system.
* [[Opioid|Opioid analgesics]], which also depress the central nervous system. These are used recreationally because of their euphoric effects.
* [[Inhalant]]s, in the forms of gas aerosols, or solvents, which are inhaled as a vapor because of their stupefying effects. Many inhalants also fall into the above categories (such as [[nitrous oxide]] which is also an analgesic).

In some modern and ancient cultures, drug usage is seen as a [[Social status|status]] symbol. Recreational drugs are seen as status symbols in settings such as at [[nightclub]]s and parties.<ref>{{cite journal | author = Anderson TL | title = Drug identity change processes, race, and gender. III. Macrolevel opportunity concepts | journal = Substance Use & Misuse | volume = 33 | issue = 14 | pages = 2721–35 | year = 1998 | pmid = 9869440 | doi = 10.3109/10826089809059347 }}</ref> For example, in [[ancient Egypt]], gods were commonly pictured holding hallucinogenic plants.<ref>{{cite journal | author = Bertol E, Fineschi V, Karch SB, Mari F, Riezzo I | title = Nymphaea cults in ancient Egypt and the New World: a lesson in empirical pharmacology | journal = Journal of the Royal Society of Medicine | volume = 97 | issue = 2 | pages = 84–5 | year = 2004 | pmid = 14749409 | pmc = 1079300 | doi = 10.1177/014107680409700214 | last2 = Fineschi | last3 = Karch | last4 = Mari | last5 = Riezzo }}</ref>

Because there is controversy about regulation of recreational drugs, there is an [[arguments for and against drug prohibition|ongoing debate about drug prohibition]]. Critics of prohibition believe that regulation of recreational drug use is a violation of personal autonomy and [[liberty|freedom]].<ref>{{cite journal | author = Hayry M | title = Prescribing cannabis: freedom, autonomy, and values | journal = Journal of Medical Ethics | volume = 30 | issue = 4 | pages = 333–6 | year = 2004 | pmid = 15289511 | pmc = 1733898 | doi = 10.1136/jme.2002.001347 }}</ref> In the United States, critics have noted that prohibition or regulation of recreational and spiritual drug use might be [[unconstitutional]], and causing more harm than is prevented.<ref>Barnett, Randy E. [http://law.wustl.edu/Journal/22/p29Barnett.pdf "The Presumption of Liberty and the Public Interest: Medical Marijuana and Fundamental Rights"] {{webarchive|url=https://web.archive.org/web/20070711001509/http://law.wustl.edu/Journal/22/p29Barnett.pdf |date=2007-07-11 }}. Retrieved 4 July 2007.</ref>

===Ritual and spiritual===
[[File:Timothy-Leary-Los-Angeles-1989.jpg|thumb|upright|[[Timothy Leary]] was a leading proponent of spiritual hallucinogen use.]]
{{Main article| Entheogens}}
Certain psychoactives, particularly hallucinogens, have been used for religious purposes since prehistoric times. Native Americans have used [[peyote]] cacti containing [[mescaline]] for religious ceremonies for as long as 5700 years.<ref>{{cite journal | author = El-Seedi HR, De Smet PA, Beck O, Possnert G, Bruhn JG | title = Prehistoric peyote use: alkaloid analysis and radiocarbon dating of archaeological specimens of Lophophora from Texas | journal = Journal of Ethnopharmacology | volume = 101 | issue = 1–3 | pages = 238–42 | year = 2005 | pmid = 15990261 | doi = 10.1016/j.jep.2005.04.022 | last2 = De Smet | last3 = Beck | last4 = Possnert | last5 = Bruhn }}</ref> The [[muscimol]]-containing [[Amanita muscaria]] mushroom was used for ritual purposes throughout prehistoric Europe.<ref>{{cite journal | author = Vetulani J | title = Drug addiction. Part I. Psychoactive substances in the past and presence | journal = Polish Journal of Pharmacology | volume = 53 | issue = 3 | pages = 201–14 | year = 2001 | pmid = 11785921 | doi = }}</ref>

The use of entheogens for religious purposes resurfaced in the West during the [[Counterculture of the 1960s|counterculture movements]] of the 1960s and 70s. Under the leadership of [[Timothy Leary]], new spiritual and intention-based movements began to use [[LSD]] and other hallucinogens as tools to access deeper inner exploration. In the United States, the use of peyote for ritual purposes is protected only for members of the [[Native American Church]], which is allowed to cultivate and distribute [[peyote]]. However, the genuine religious use of peyote, regardless of one's personal ancestry, is protected in Colorado, Arizona, New Mexico, Nevada, and Oregon.<ref>{{cite journal | author = Bullis RK | title = Swallowing the scroll: legal implications of the recent Supreme Court peyote cases | journal = Journal of Psychoactive Drugs | volume = 22 | issue = 3 | pages = 325–32 | year = 1990 | pmid = 2286866 | doi = 10.1080/02791072.1990.10472556}}</ref>

=== Military ===
{{Main article|Psychochemical warfare|List of drugs used by militaries}}
Psychoactive drugs have been used in military applications as [[non-lethal weapon]]s.

Both military and civilian American intelligence officials are known to have used psychoactive drugs while interrogating captives apprehended in its [[War on Terror]]. In July 2012, [[Jason Leopold]] and Jeffrey Kaye, psychologists and human rights workers, had a [[Freedom of Information Act]] request fulfilled that confirmed that the use of psychoactive drugs during interrogation was a long-standing
practice.<ref name=Truthout2012-07-11>
{{cite news| url = http://truth-out.org/news/item/10248-exclusive-department-of-defense-declassifies-report-on-alleged-drugging-of-detainees| title = EXCLUSIVE: DoD Report Reveals Some Detainees Interrogated While Drugged, Others "Chemically Restrained"| publisher = [[Truthout]]|author1=Jason Leopold |author2=Jeffrey Kaye | date = 2011-07-11| archivedate = 2012-07-14| archiveurl = https://www.webcitation.org/query?url=http%3A%2F%2Ftruth-out.org%2Fnews%2Fitem%2F10248-exclusive-department-of-defense-declassifies-report-on-alleged-drugging-of-detainees&date=2012-07-14| deadurl = no| quote = Truthout obtained a copy of the report – "Investigation of Allegations of the Use of Mind-Altering Drugs to Facilitate Interrogations of Detainees" – prepared by the DoD's deputy inspector general for intelligence in September 2009, under a Freedom of Information Act (FOIA) request we filed nearly two years ago.}}
</ref><ref name=Wired2012-07-11>
{{cite news| url = https://www.wired.com/dangerroom/2012/07/gitmo/| title = U.S. Injected Gitmo Detainees With 'Mind Altering' Drugs| publisher = [[Wired magazine]]| author = Robert Beckhusen| date = 2012-07-11| page = | accessdate = 2012-07-14| archivedate = 2012-07-14| archiveurl = https://www.webcitation.org/query?url=http%3A%2F%2Fwww.wired.com%2Fdangerroom%2F2012%2F07%2Fgitmo%2F&date=2012-07-14| deadurl = no| quote = That's according to a recently declassified report (.pdf) from the Pentagon's inspector general, obtained by Truthout's Jeffrey Kaye and Jason Leopold after a Freedom of Information Act Request. In it, the inspector general concludes that "certain detainees, diagnosed as having serious mental health conditions being treated with psychoactive medications on a continuing basis, were interrogated." The report does not conclude, though, that anti-psychotic drugs were used specifically for interrogation purposes.}}
</ref>
Captives and former captives had been reporting medical staff collaborating with interrogators to drug captives with powerful psychoactive drugs prior to interrogation since the very first captives' release.<ref name=Bbc2003-05-23>
{{cite news| url=http://news.bbc.co.uk/2/hi/south_asia/3051501.stm| title=Pakistani relives Guantanamo ordeal| publisher=BBC News| author=Haroon Rashid| date=2003-05-23| accessdate=2009-01-09| archivedate = 2012-07-14| archiveurl = https://www.webcitation.org/query?url=http%3A%2F%2Fnews.bbc.co.uk%2F2%2Fhi%2Fsouth_asia%2F3051501.stm&date=2012-07-14| deadurl = no| quote = Mr Shah alleged that the Americans had given him injections and tablets prior to interrogations. "They used to tell me I was mad," the 23-year-old told the BBC in his native village in Dir district near the Afghan border. I was given injections at least four or five times as well as different tablets. I don't know what they were meant for."}}
</ref><ref name=Guardian2003-12-03>
{{cite news| url = https://www.theguardian.com/guantanamo/story/0,13743,1098604,00.html| title = People the law forgot| publisher = The Guardian| date = 2003-12-03| page = | accessdate = 2012-07-14| archivedate = 2012-07-14| archiveurl = https://www.webcitation.org/query?url=http%3A%2F%2Fwww.guardian.co.uk%2Fworld%2F2003%2Fdec%2F03%2Fguantanamo.usa1&date=2012-07-14| deadurl = no| quote = The biggest damage is to my brain. My physical and mental state isn't right. I'm a changed person. I don't laugh or enjoy myself much.| location=London| first=James| last=Meek}}
</ref>
In May 2003, recently released [[Pakistani captives in Guantanamo|Pakistani captive]] [[Sha Mohammed Alikhel]] described the routine use of psychoactive drugs in the [[Guantanamo Bay detention center]]. He said that [[Jihan Wali]], a captive kept in a nearby cell, was rendered catatonic through the use of these drugs.

The military justice system has also been known to use psychoactive drugs to obtain a conviction. (U.S. vs. Juillerat)<ref>ACM 34205, afcca.law.af.mil</ref>

Additionally, militaries worldwide have used or are using various psychoactive drugs to [[Performance-enhancing substance|improve performance]] of soldiers by suppressing hunger, increasing the ability to sustain effort without food, increasing and lengthening [[wakefulness]] and concentration, suppressing [[fear]], reducing empathy, and improving reflexes and memory-recall among other things.<ref name="Stoker2013">{{cite web |last1=Stoker |first1=Liam |title=Analysis Creating Supermen: battlefield performance enhancing drugs |url=https://www.army-technology.com/features/featurecreating-supermen-battlefield-performance-enhancing-drugs/ |website=Army Technology |publisher=[[Verdict Media Limited]] |accessdate=22 June 2018 |date=14 April 2013}}</ref><ref>{{cite web|last1=Kamienski|first1=Lukasz|title=The Drugs That Built a Super Soldier|url=https://www.theatlantic.com/health/archive/2016/04/the-drugs-that-built-a-super-soldier/477183/|publisher=The Atlantic|accessdate=22 June 2018}}</ref>

== Route of administration ==
Psychoactive drugs are administered via oral [[ingestion]] as a tablet, capsule, powder, liquid, and beverage; via [[injection (medicine)|injection]] by [[subcutaneous injection|subcutaneous]], [[intramuscular]], and [[intravenous]] route; via rectum by suppository and enema; and via inhalation by [[smoking]], [[vaporization]] and [[insufflation]] ("snorting"). The efficiency of each method of administration varies from drug to drug.<ref>United States Food and Drug Administration. [http://www.fda.gov/cder/dsm/DRG/drg00301.htm CDER Data Standards Manual] {{webarchive|url=https://web.archive.org/web/20060103175139/http://www.fda.gov/cder/dsm/DRG/drg00301.htm |date=2006-01-03 }}. Retrieved on May 15, 2007.</ref>

The psychiatric drugs [[fluoxetine]], [[quetiapine]], and [[lorazepam]] are [[ingest]]ed orally in [[Tablet (pharmacy)|tablet]] or [[Capsule (pharmacy)|capsule]] form. [[Grain alcohol|Alcohol]] and [[caffeine]] are ingested in beverage form; [[nicotine]] and [[cannabis (drug)|cannabis]] are smoked or [[Vaporizer (inhalation device)|vaped]]; [[peyote]] and [[psilocybin mushroom]]s are ingested in botanical form or dried; and crystalline drugs such as [[cocaine]] and [[methamphetamines|methamphetamine]] are usually [[Insufflation (medicine)|insufflated]] (inhaled or "snorted").

==Determinants of effects==
The theory of dosage, set, and setting is a useful model in dealing with the effects of psychoactive substances, especially in a controlled therapeutic setting as well as in recreational use. [[Timothy Leary|Dr. Timothy Leary]], based on his own experiences and systematic observations on psychedelics, developed this theory along with his colleagues [[Ralph Metzner]], and [[Richard Alpert]] ([[Ram Dass]]) in the 1960s.<ref>The Psychedelic Experience. New York: University Books. 1964</ref>

;Dosage
The first factor, dosage, has been a truism since ancient times, or at least since [[Paracelsus]] who said, "Dose makes the poison." Some compounds are beneficial or pleasurable when consumed in small amounts, but harmful, deadly, or evoke discomfort in higher doses.

;Set
The set is the internal attitudes and constitution of the person, including their expectations, wishes, fears, and sensitivity to the drug. This factor is especially important for the hallucinogens, which have the ability to make conscious experiences out of the unconscious. In traditional cultures, set is shaped primarily by the worldview, health and genetic characteristics that all the members of the culture share.

;Setting
The third aspect is setting, which pertains to the surroundings, the place, and the time in which the experiences transpire.

This theory clearly states that the effects are equally the result of chemical, pharmacological, psychological, and physical influences. The model that Timothy Leary proposed applied to the psychedelics, although it also applies to other psychoactives.<ref name="Psychoactive Plants pg. 10">{{cite book | title=The Encyclopedia of Psychoactive Plants | publisher=Park Street Press | author=Ratsch, Christian | authorlink=Christian Rätsch| date=May 5, 2005 | page=944 | isbn=0-89281-978-2}}</ref>

== Effects ==
[[File:SynapseSchematic en.svg|thumb|right|300px|Illustration of the major elements of [[neurotransmission]]. Depending on its method of action, a psychoactive substance may block the receptors on the post-synaptic neuron ([[dendrite]]), or block reuptake or affect neurotransmitter synthesis in the pre-synaptic neuron ([[axon]]).]]
{{Main article| Neuropsychopharmacology}}
Psychoactive drugs operate by temporarily affecting a person's neurochemistry, which in turn causes changes in a person's mood, cognition, perception and behavior. There are many ways in which psychoactive drugs can affect the brain. Each drug has a specific action on one or more [[neurotransmitter]] or [[neuroreceptor]] in the brain.

Drugs that increase activity in particular neurotransmitter systems are called [[agonists]]. They act by increasing the [[Chemical synthesis|synthesis]] of one or more neurotransmitters, by reducing its [[reuptake]] from the [[synapses]], or by mimicking the action by binding directly to the postsynaptic receptor. Drugs that reduce neurotransmitter activity are called [[Receptor antagonist|antagonists]], and operate by interfering with synthesis or blocking postsynaptic receptors so that neurotransmitters cannot bind to them.<ref>{{cite book| last = Seligma| first = Martin E.P.| title = Abnormal Psychology| publisher = W. W. Norton & Company|year=1984| isbn = 0-393-94459-X| chapter = 4 }}</ref>

Exposure to a psychoactive substance can cause changes in the structure and functioning of [[neurons]], as the nervous system tries to re-establish the [[homeostasis]] disrupted by the presence of the drug (see also, [[neuroplasticity]]). Exposure to antagonists for a particular neurotransmitter can increase the number of receptors for that neurotransmitter or the receptors themselves may become more responsive to neurotransmitters; this is called [[sensitization]]. Conversely, overstimulation of receptors for a particular neurotransmitter may cause a decrease in both number and sensitivity of these receptors, a process called [[Desensitization (medicine)|desensitization]] or [[Drug tolerance|tolerance]]. Sensitization and desensitization are more likely to occur with long-term exposure, although they may occur after only a single exposure. These processes are thought to play a role in drug dependence and addiction.<ref>{{cite web | title=University of Texas, Addiction Science Research and Education Center | url=http://www.utexas.edu/research/asrec/dopamine.html | accessdate=May 14, 2007 | deadurl=yes | archiveurl=https://www.webcitation.org/618NxQOGJ?url=http://www.utexas.edu/research/asrec/dopamine.html | archivedate=August 22, 2011 | df= }}</ref> [[Physical dependence]] on antidepressants or anxiolytics may result in worse depression or anxiety, respectively, as withdrawal symptoms. Unfortunately, because [[clinical depression]] (also called [[major depressive disorder]]) is often referred to simply as [[Depression (mood)|depression]], antidepressants are often requested by and prescribed for patients who are depressed, but not clinically depressed.

=== Affected neurotransmitter systems ===
The following is a brief table of notable drugs and their primary neurotransmitter, receptor or method of action. Many drugs act on more than one transmitter or receptor in the brain.<ref>{{cite journal | author = Lüscher C, Ungless MA | title = The mechanistic classification of addictive drugs | journal = PLoS Medicine | volume = 3 | issue = 11 | pages = e437 | year = 2006 | pmid = 17105338 | pmc = 1635740 | doi = 10.1371/journal.pmed.0030437 | last2 = Ungless }}</ref>

{| class="wikitable"
|-
|-
|Dopamine releasers
!Neurotransmitter/receptor
|Cavendish [[bananas]],<ref>{{cite journal |last1=Kanazawa |first1=Kazuki |last2=Sakakibara |first2=Hiroyuki |title=High Content of Dopamine, a Strong Antioxidant, in Cavendish Banana |journal=Journal of Agricultural and Food Chemistry |volume=48 |issue=3 |pages=844–8 |year=2000 |pmid=10725161 |doi=10.1021/jf9909860 }}</ref> [[TAAR1 agonist]]s like ''[[amphetamine]], [[phenethylamine]], and [[methamphetamine]]''
!Classification
!''Examples''
|-
|-
|Dopamine receptor agonists
|rowspan=3|<center>[[File:Acetylcholine.svg|150px]]</center><br /><center>[[Acetylcholine]]</center>
|''[[pramipexole]], [[Ropinirole]], [[L-DOPA]]'' ([[prodrug]]), ''[[memantine]]'' (also see NMDA, below)
|[[Cholinergic]]s (acetylcholine receptor agonists)
|''[[arecoline]], [[nicotine]], [[piracetam]]''
|-
|-
|[[Muscarinic antagonist]]s (acetylcholine receptor antagonists)
|Dopamine receptor antagonists
|''[[haloperidol]], [[droperidol]]'', many [[antipsychotics]] (e.g., ''[[risperidone]], [[olanzapine]], [[quetiapine]]'')
|-
|Dopamine receptor partial agonists
|''[[LSD]], [[aripiprazole]]''
|-
|rowspan=3|<br /><center>[[File:Gamma-Aminobuttersäure - gamma-aminobutyric acid.svg|150px]]</center><br /><center>[[gamma-Aminobutyric acid]] (GABA)</center>
|GABA reuptake inhibitors
|''[[tiagabine]], [[St John's wort]], [[vigabatrin]], [[deramciclane]]
|-
|GABA receptor agonists
|''[[ethanol]], [[niacin]],<ref>{{cite web |url=http://orthomolecular.org/resources/omns/v10n09.shtml |title=Archived copy |accessdate=2016-07-31 |deadurl=no |archiveurl=https://web.archive.org/web/20160816143209/http://orthomolecular.org/resources/omns/v10n09.shtml |archivedate=2016-08-16 |df= }}{{full citation needed|date=August 2016}}</ref> [[barbiturates]], [[diazepam]], [[clonazepam]], [[lorazepam]], [[temazepam]], [[alprazolam]]'' and other [[benzodiazepines]], ''[[zolpidem]], [[eszopiclone]], [[zaleplon]]'' and other [[nonbenzodiazepines]], ''[[muscimol]]'', ''[[phenibut]]''
|-
|GABA receptor antagonists
|''[[thujone]], [[bicuculline]]''
|-
|rowspan=4|<center>[[File:Norepinephrine structure with descriptor.svg|150px]]</center><br /><center>[[Norepinephrine]]</center>
|Norepinephrine reuptake inhibitors
|''[[St John's wort]]'',<ref>{{cite journal |last1=Di Carlo |first1=Giulia |last2=Borrelli |first2=Francesca |last3=Ernst |first3=Edzard |last4=Izzo |first4=Angelo A. |title=St John's wort: Prozac from the plant kingdom |journal=Trends in Pharmacological Sciences |volume=22 |issue=6 |pages=292–7 |year=2001 |pmid=11395157 |doi=10.1016/S0165-6147(00)01716-8 }}</ref> most non-[[SSRI]] [[antidepressants]] such as ''[[amoxapine]], [[atomoxetine]], [[bupropion]], [[venlafaxine]], [[quetiapine]]'', the [[tricyclics]], ''[[methylphenidate]]'', [[SNRI]]s such as ''[[duloxetine]], [[venlafaxine]], [[cocaine]]'', ''[[tramadol]]'', and certain [[TAAR1 agonist]]s like ''[[amphetamine]], [[phenethylamine]], [[methamphetamine]]''.
|-
|Norepinephrine releasers
|''[[ephedrine]], [[phenylpropanolamine|PPA]], [[pseudoephedrine]], [[amphetamine]], [[phenethylamine]], [[methamphetamine]]''
|-
|Norepinephrine receptor agonists
|''[[clonidine]], [[guanfacine]], [[phenylephrine]]''
|-
|Norepinephrine receptor antagonists
|''[[carvedilol]], [[metoprolol]], [[mianserin]], [[prazosin]], [[propranolol]], [[trazodone]], [[yohimbine]], [[olanzapine]]''
|-
|rowspan=4|<center>[[File:Serotonin.svg|150px]]<center>[[Serotonin]]</center>
|Serotonin [[receptor agonist]]s
|''[[methylphenidate]]'', ''[[LSD]], [[psilocybin]], [[mescaline]], [[Dimethyltryptamine|DMT]]''
|-
|[[Serotonin reuptake inhibitor]]s
|most [[antidepressants]] including ''[[St John's wort]]'', [[tricyclics]] such as ''[[imipramine]]'', [[Selective serotonin reuptake inhibitor|SSRIs]] such as ''[[fluoxetine]]'', ''[[sertraline]]'' and ''[[citalopram]]'', and [[Serotonin–norepinephrine reuptake inhibitor|SNRIs]] such as ''[[duloxetine]]'' and ''[[venlafaxine]]'', ''[[cocaine]]'', ''[[tramadol]]'', and certain [[TAAR1 agonist]]s like ''[[amphetamine]], [[tryptamine]], and [[methamphetamine]]''
|-
|Serotonin releasers
|''[[fenfluramine]]'', ''[[MDMA]]'' (ecstasy), ''[[tryptamine]]''
|-
|Serotonin receptor antagonists
|''[[ritanserin]]'', ''[[mirtazapine]]'', ''[[mianserin]]'', ''[[trazodone]]'', ''[[cyproheptadine]]'', ''[[memantine]]'', [[atypical antipsychotics]] (e.g., ''[[risperidone]]'', ''[[olanzapine]]'', ''[[quetiapine]]'')
|-
|rowspan=2|<center>[[File:AMPA.svg|150px]]<center>[[AMPA receptor]]</center>
|AMPA receptor positive allosteric modulators
|''[[aniracetam]], [[CX717]], [[piracetam]]''
|-
|AMPA receptor antagonists
|''[[kynurenic acid]], [[NBQX]], [[topiramate]]''
|-
|rowspan=4|<center>[[File:Tetrahydrocannabinol.svg|150px]]<center>[[Cannabinoid receptor]]</center>
|Cannabinoid receptor agonists
|''[[JWH-018]]''
|-
|Cannabinoid receptor partial agonists
|''[[Anandamide]]'', ''[[THC]]'', ''[[cannabidiol]]'', ''[[cannabinol]]''
|-
|Cannabinoid receptor inverse agonists
|''[[Rimonabant]]''
|-
|-
|Anandamide reuptake inhibitors<ref>{{cite web |url=http://www.tocris.com/pdfs/cannabinoid_receptor_review/page_011.html |title=Inhibitors of the Enzymic Hydrolysis of Endocannabinoids |publisher=Tocris.com |accessdate=2013-11-23 |deadurl=no |archiveurl=https://web.archive.org/web/20130310041644/http://www.tocris.com/pdfs/cannabinoid_receptor_review/page_011.html |archivedate=2013-03-10 |df= }}</ref>
|Anandamide reuptake inhibitors<ref>{{cite web |url=http://www.tocris.com/pdfs/cannabinoid_receptor_review/page_011.html |title=Inhibitors of the Enzymic Hydrolysis of Endocannabinoids |publisher=Tocris.com |accessdate=2013-11-23 |deadurl=no |archiveurl=https://web.archive.org/web/20130310041644/http://www.tocris.com/pdfs/cannabinoid_receptor_review/page_011.html |archivedate=2013-03-10 |df= }}</ref>

Revision as of 05:51, 28 July 2019

An assortment of psychoactive drugs—street drugs and medications:
  1. cocaine
  2. crack cocaine
  3. methylphenidate (Ritalin)
  4. ephedrine
  5. MDMA (ecstasy)
  6. Peyote (mescaline)
  7. LSD blotter
  8. psilocybin mushroom (Psilocybe cubensis)
  9. Salvia divinorum
  10. diphenhydramine (Benadryl)
  11. Amanita muscaria mushroom
  12. Tylenol 3 (contains codeine)
  13. codeine with muscle relaxant
  14. pipe tobacco
  15. bupropion (Zyban)
  16. cannabis
  17. hashish

A psychoactive drug, psychopharmaceutical, or psychotropic drug is a chemical substance that changes brain function and results in alterations in perception, mood, consciousness, cognition, or behavior.[1] These substances may be used medically; recreationally; to purposefully improve performance or alter one's consciousness; as entheogens; for ritual, spiritual, or shamanic purposes; or for research. Some categories of psychoactive drugs, which have therapeutic value, are prescribed by physicians and other healthcare practitioners. Examples include anesthetics, analgesics, anticonvulsant and antiparkinsonian drugs as well as medications used to treat neuropsychiatric disorders, such as antidepressants, anxiolytics, antipsychotics, and stimulant medications. Some psychoactive substances may be used in the detoxification and rehabilitation programs for persons dependent on or addicted to other psychoactive drugs.

Psychoactive substances often bring about subjective (although these may be objectively observed) changes in consciousness and mood that the user may find rewarding and pleasant (e.g., euphoria or a sense of relaxation) or advantageous (e.g. increased alertness) and are thus reinforcing. Substances which are both rewarding and positively reinforcing have the potential to induce a state of addiction – compulsive drug use despite negative consequences. In addition, sustained use of some substances may produce physical or psychological dependence or both, associated with somatic or psychological-emotional withdrawal states respectively. Drug rehabilitation attempts to reduce addiction, through a combination of psychotherapy, support groups, and other psychoactive substances. Conversely, certain psychoactive drugs may be so unpleasant that the person will never use the substance again. This is especially true of certain deliriants (e.g. Jimson weed), powerful dissociatives (e.g. Salvia divinorum), and classic psychedelics (e.g. LSD, psilocybin), in the form of a "bad trip".

Psychoactive drug misuse, dependence and addiction have resulted in legal measures and moral debate. Governmental controls on manufacture, supply and prescription attempt to reduce problematic medical drug use. Ethical concerns have also been raised about over-use of these drugs clinically, and about their marketing by manufacturers. Popular campaigns to decriminalize or legalize certain recreational drug use (e.g. cannabis) are also ongoing.

History

Alcohol is a widely used and abused psychoactive drug. The global alcoholic drinks market was expected to exceed $1 trillion in 2013.[2] Beer is the third-most popular drink overall, after water and tea.[3]

Psychoactive drug use can be traced to prehistory. There is archaeological evidence of the use of psychoactive substances (mostly plants) dating back at least 10,000 years, and historical evidence of cultural use over the past 5,000 years.[4] The chewing of coca leaves, for example, dates back over 8,000 years ago in Peruvian society.[5][6]

Medicinal use is one important facet of psychoactive drug usage. However, some have postulated that the urge to alter one's consciousness is as primary as the drive to satiate thirst, hunger or sexual desire.[7] Supporters of this belief contend that the history of drug use and even children's desire for spinning, swinging, or sliding indicate that the drive to alter one's state of mind is universal.[8]

One of the first people to articulate this point of view, set aside from a medicinal context, was American author Fitz Hugh Ludlow (1836–1870) in his book The Hasheesh Eater (1857):

[D]rugs are able to bring humans into the neighborhood of divine experience and can thus carry us up from our personal fate and the everyday circumstances of our life into a higher form of reality. It is, however, necessary to understand precisely what is meant by the use of drugs. We do not mean the purely physical craving...That of which we speak is something much higher, namely the knowledge of the possibility of the soul to enter into a lighter being, and to catch a glimpse of deeper insights and more magnificent visions of the beauty, truth, and the divine than we are normally able to spy through the cracks in our prison cell. But there are not many drugs which have the power of stilling such craving. The entire catalog, at least to the extent that research has thus far written it, may include only opium, hashish, and in rarer cases alcohol, which has enlightening effects only upon very particular characters.[9]

This relationship is not limited to humans. A number of animals consume different psychoactive plants, animals, berries and even fermented fruit, becoming intoxicated, such as cats after consuming catnip. Traditional legends of sacred plants often contain references to animals that introduced humankind to their use.[10] Animals and psychoactive plants appear to have co-evolved, possibly explaining why these chemicals and their receptors exist within the nervous system.[11]

During the 20th century, many governments across the world initially responded to the use of recreational drugs by banning them and making their use, supply, or trade a criminal offense. A notable example of this was Prohibition in the United States, where alcohol was made illegal for 13 years. However, many governments, government officials and persons in law enforcement have concluded that illicit drug use cannot be sufficiently stopped through criminalization. Organizations such as Law Enforcement Against Prohibition (LEAP) have come to such a conclusion, believing:

[T]he existing drug policies have failed in their intended goals of addressing the problems of crime, drug abuse, addiction, juvenile drug use, stopping the flow of illegal drugs into this country and the internal sale and use of illegal drugs. By fighting a war on drugs the government has increased the problems of society and made them far worse. A system of regulation rather than prohibition is a less harmful, more ethical and a more effective public policy.[12][failed verification]

In some countries, there has been a move toward harm reduction by health services, where the use of illicit drugs is neither condoned nor promoted, but services and support are provided to ensure users have adequate factual information readily available, and that the negative effects of their use be minimized. Such is the case of Portuguese drug policy of decriminalization, which achieved its primary goal of reducing the adverse health effects of drug abuse.[13]

Purposes

Psychoactive substances are used by humans for a number of different purposes to achieve a specific end. These uses vary widely between cultures. Some substances may have controlled or illegal uses while others may have shamanic purposes, and still others are used medicinally. Other examples would be social drinking, nootropic, or sleep aids. Caffeine is the world's most widely consumed psychoactive substance, but unlike many others, it is legal and unregulated in nearly all jurisdictions. In North America, 90% of adults consume caffeine daily.[14]

Psychoactive drugs are divided into different groups according to their pharmacological effects. Commonly used psychoactive drugs and groups:

Example: benzodiazepines, barbiturates
Example: MDMA (Ecstasy), MDA, 6-APB, AMT
  • Stimulants ("uppers"). This category comprises substances that wake one up, stimulate the mind, and may cause euphoria, but do not affect perception.
Examples: amphetamine, caffeine, cocaine, nicotine, modafinil
  • Depressants ("downers"), including sedatives, hypnotics, and opioids. This category includes all of the calmative, sleep-inducing, anxiety-reducing, anesthetizing substances, which sometimes induce perceptual changes, such as dream images, and also often evoke feelings of euphoria.
Examples: ethanol (alcoholic beverages), opioids, cannabis, barbiturates, benzodiazepines.
Examples: psilocybin, LSD, Salvia divinorum, nitrous oxide and scopolamine.

Uses

Anesthesia

General anesthetics are a class of psychoactive drug used on people to block physical pain and other sensations. Most anesthetics induce unconsciousness, allowing the person to undergo medical procedures like surgery without the feelings of physical pain or emotional trauma.[16] To induce unconsciousness, anesthetics affect the GABA and NMDA systems. For example, propofol is a GABA agonist,[17] and ketamine is an NMDA receptor antagonist.[18]

Pain management

Psychoactive drugs are often prescribed to manage pain. The subjective experience of pain is primarily regulated by endogenous opioid peptides. Thus, pain can often be managed using psychoactives that operate on this neurotransmitter system, also known as opioid receptor agonists. This class of drugs can be highly addictive, and includes opiate narcotics, like morphine and codeine.[19] NSAIDs, such as aspirin and ibuprofen, are also analgesics. These agents also reduce eicosanoid-mediated inflammation by inhibiting the enzyme cyclooxygenase.

Mental disorders

Zoloft (sertraline) is an SSRI antidepressant.

Psychiatric medications are psychoactive drugs prescribed for the management of mental and emotional disorders, or to aid in overcoming challenging behavior.[20] There are six major classes of psychiatric medications:

In addition, several psychoactive substances are currently employed to treat various addictions. These include acamprosate or naltrexone in the treatment of alcoholism, or methadone or buprenorphine maintenance therapy in the case of opioid addiction.[22]

Exposure to psychoactive drugs can cause changes to the brain that counteract or augment some of their effects; these changes may be beneficial or harmful. However, there is a significant amount of evidence that relapse rate of mental disorders negatively corresponds with length of properly followed treatment regimens (that is, relapse rate substantially declines over time), and to a much greater degree than placebo.[23]

Recreation

Many psychoactive substances are used for their mood and perception altering effects, including those with accepted uses in medicine and psychiatry. Examples of psychoactive substances include caffeine, alcohol, cocaine, LSD, nicotine and cannabis.[24] Classes of drugs frequently used recreationally include:

In some modern and ancient cultures, drug usage is seen as a status symbol. Recreational drugs are seen as status symbols in settings such as at nightclubs and parties.[25] For example, in ancient Egypt, gods were commonly pictured holding hallucinogenic plants.[26]

Because there is controversy about regulation of recreational drugs, there is an ongoing debate about drug prohibition. Critics of prohibition believe that regulation of recreational drug use is a violation of personal autonomy and freedom.[27] In the United States, critics have noted that prohibition or regulation of recreational and spiritual drug use might be unconstitutional, and causing more harm than is prevented.[28]

Ritual and spiritual

Timothy Leary was a leading proponent of spiritual hallucinogen use.

Certain psychoactives, particularly hallucinogens, have been used for religious purposes since prehistoric times. Native Americans have used peyote cacti containing mescaline for religious ceremonies for as long as 5700 years.[29] The muscimol-containing Amanita muscaria mushroom was used for ritual purposes throughout prehistoric Europe.[30]

The use of entheogens for religious purposes resurfaced in the West during the counterculture movements of the 1960s and 70s. Under the leadership of Timothy Leary, new spiritual and intention-based movements began to use LSD and other hallucinogens as tools to access deeper inner exploration. In the United States, the use of peyote for ritual purposes is protected only for members of the Native American Church, which is allowed to cultivate and distribute peyote. However, the genuine religious use of peyote, regardless of one's personal ancestry, is protected in Colorado, Arizona, New Mexico, Nevada, and Oregon.[31]

Military

Psychoactive drugs have been used in military applications as non-lethal weapons.

Both military and civilian American intelligence officials are known to have used psychoactive drugs while interrogating captives apprehended in its War on Terror. In July 2012, Jason Leopold and Jeffrey Kaye, psychologists and human rights workers, had a Freedom of Information Act request fulfilled that confirmed that the use of psychoactive drugs during interrogation was a long-standing practice.[32][33] Captives and former captives had been reporting medical staff collaborating with interrogators to drug captives with powerful psychoactive drugs prior to interrogation since the very first captives' release.[34][35] In May 2003, recently released Pakistani captive Sha Mohammed Alikhel described the routine use of psychoactive drugs in the Guantanamo Bay detention center. He said that Jihan Wali, a captive kept in a nearby cell, was rendered catatonic through the use of these drugs.

The military justice system has also been known to use psychoactive drugs to obtain a conviction. (U.S. vs. Juillerat)[36]

Additionally, militaries worldwide have used or are using various psychoactive drugs to improve performance of soldiers by suppressing hunger, increasing the ability to sustain effort without food, increasing and lengthening wakefulness and concentration, suppressing fear, reducing empathy, and improving reflexes and memory-recall among other things.[37][38]

Route of administration

Psychoactive drugs are administered via oral ingestion as a tablet, capsule, powder, liquid, and beverage; via injection by subcutaneous, intramuscular, and intravenous route; via rectum by suppository and enema; and via inhalation by smoking, vaporization and insufflation ("snorting"). The efficiency of each method of administration varies from drug to drug.[39]

The psychiatric drugs fluoxetine, quetiapine, and lorazepam are ingested orally in tablet or capsule form. Alcohol and caffeine are ingested in beverage form; nicotine and cannabis are smoked or vaped; peyote and psilocybin mushrooms are ingested in botanical form or dried; and crystalline drugs such as cocaine and methamphetamine are usually insufflated (inhaled or "snorted").

Determinants of effects

The theory of dosage, set, and setting is a useful model in dealing with the effects of psychoactive substances, especially in a controlled therapeutic setting as well as in recreational use. Dr. Timothy Leary, based on his own experiences and systematic observations on psychedelics, developed this theory along with his colleagues Ralph Metzner, and Richard Alpert (Ram Dass) in the 1960s.[40]

Dosage

The first factor, dosage, has been a truism since ancient times, or at least since Paracelsus who said, "Dose makes the poison." Some compounds are beneficial or pleasurable when consumed in small amounts, but harmful, deadly, or evoke discomfort in higher doses.

Set

The set is the internal attitudes and constitution of the person, including their expectations, wishes, fears, and sensitivity to the drug. This factor is especially important for the hallucinogens, which have the ability to make conscious experiences out of the unconscious. In traditional cultures, set is shaped primarily by the worldview, health and genetic characteristics that all the members of the culture share.

Setting

The third aspect is setting, which pertains to the surroundings, the place, and the time in which the experiences transpire.

This theory clearly states that the effects are equally the result of chemical, pharmacological, psychological, and physical influences. The model that Timothy Leary proposed applied to the psychedelics, although it also applies to other psychoactives.[41]

Effects

Illustration of the major elements of neurotransmission. Depending on its method of action, a psychoactive substance may block the receptors on the post-synaptic neuron (dendrite), or block reuptake or affect neurotransmitter synthesis in the pre-synaptic neuron (axon).

Psychoactive drugs operate by temporarily affecting a person's neurochemistry, which in turn causes changes in a person's mood, cognition, perception and behavior. There are many ways in which psychoactive drugs can affect the brain. Each drug has a specific action on one or more neurotransmitter or neuroreceptor in the brain.

Drugs that increase activity in particular neurotransmitter systems are called agonists. They act by increasing the synthesis of one or more neurotransmitters, by reducing its reuptake from the synapses, or by mimicking the action by binding directly to the postsynaptic receptor. Drugs that reduce neurotransmitter activity are called antagonists, and operate by interfering with synthesis or blocking postsynaptic receptors so that neurotransmitters cannot bind to them.[42]

Exposure to a psychoactive substance can cause changes in the structure and functioning of neurons, as the nervous system tries to re-establish the homeostasis disrupted by the presence of the drug (see also, neuroplasticity). Exposure to antagonists for a particular neurotransmitter can increase the number of receptors for that neurotransmitter or the receptors themselves may become more responsive to neurotransmitters; this is called sensitization. Conversely, overstimulation of receptors for a particular neurotransmitter may cause a decrease in both number and sensitivity of these receptors, a process called desensitization or tolerance. Sensitization and desensitization are more likely to occur with long-term exposure, although they may occur after only a single exposure. These processes are thought to play a role in drug dependence and addiction.[43] Physical dependence on antidepressants or anxiolytics may result in worse depression or anxiety, respectively, as withdrawal symptoms. Unfortunately, because clinical depression (also called major depressive disorder) is often referred to simply as depression, antidepressants are often requested by and prescribed for patients who are depressed, but not clinically depressed.

Affected neurotransmitter systems

The following is a brief table of notable drugs and their primary neurotransmitter, receptor or method of action. Many drugs act on more than one transmitter or receptor in the brain.[44]

Neurotransmitter/receptor Classification Examples

Acetylcholine
Cholinergics (acetylcholine receptor agonists) arecoline, nicotine, piracetam
Muscarinic antagonists (acetylcholine receptor antagonists) scopolamine, benzatropine, dimenhydrinate, diphenhydramine, doxylamine, atropine, quetiapine, olanzapine, most tricyclics
Nicotinic antagonists (acetylcholine receptor antagonists) memantine, bupropion
Adenosine
Adenosine receptor antagonists[45] caffeine, theobromine, theophylline

Dopamine
Dopamine reuptake inhibitors (DRIs) cocaine, bupropion, methylphenidate, St John's wort, and certain TAAR1 agonists like amphetamine, phenethylamine, and methamphetamine
Dopamine releasers Cavendish bananas,[46] TAAR1 agonists like amphetamine, phenethylamine, and methamphetamine
Dopamine receptor agonists pramipexole, Ropinirole, L-DOPA (prodrug), memantine (also see NMDA, below)
Dopamine receptor antagonists haloperidol, droperidol, many antipsychotics (e.g., risperidone, olanzapine, quetiapine)
Dopamine receptor partial agonists LSD, aripiprazole


gamma-Aminobutyric acid (GABA)
GABA reuptake inhibitors tiagabine, St John's wort, vigabatrin, deramciclane
GABA receptor agonists ethanol, niacin,[47] barbiturates, diazepam, clonazepam, lorazepam, temazepam, alprazolam and other benzodiazepines, zolpidem, eszopiclone, zaleplon and other nonbenzodiazepines, muscimol, phenibut
GABA receptor antagonists thujone, bicuculline

Norepinephrine
Norepinephrine reuptake inhibitors St John's wort,[48] most non-SSRI antidepressants such as amoxapine, atomoxetine, bupropion, venlafaxine, quetiapine, the tricyclics, methylphenidate, SNRIs such as duloxetine, venlafaxine, cocaine, tramadol, and certain TAAR1 agonists like amphetamine, phenethylamine, methamphetamine.
Norepinephrine releasers ephedrine, PPA, pseudoephedrine, amphetamine, phenethylamine, methamphetamine
Norepinephrine receptor agonists clonidine, guanfacine, phenylephrine
Norepinephrine receptor antagonists carvedilol, metoprolol, mianserin, prazosin, propranolol, trazodone, yohimbine, olanzapine
Serotonin
Serotonin receptor agonists methylphenidate, LSD, psilocybin, mescaline, DMT
Serotonin reuptake inhibitors most antidepressants including St John's wort, tricyclics such as imipramine, SSRIs such as fluoxetine, sertraline and citalopram, and SNRIs such as duloxetine and venlafaxine, cocaine, tramadol, and certain TAAR1 agonists like amphetamine, tryptamine, and methamphetamine
Serotonin releasers fenfluramine, MDMA (ecstasy), tryptamine
Serotonin receptor antagonists ritanserin, mirtazapine, mianserin, trazodone, cyproheptadine, memantine, atypical antipsychotics (e.g., risperidone, olanzapine, quetiapine)
AMPA receptor
AMPA receptor positive allosteric modulators aniracetam, CX717, piracetam
AMPA receptor antagonists kynurenic acid, NBQX, topiramate
Cannabinoid receptor
Cannabinoid receptor agonists JWH-018
Cannabinoid receptor partial agonists Anandamide, THC, cannabidiol, cannabinol
Cannabinoid receptor inverse agonists Rimonabant
Anandamide reuptake inhibitors[49] LY 2183240, VDM 11, AM 404
FAAH enzyme
FAAH enzyme inhibitors MAFP, URB597, N-Arachidonylglycine
Melanocortin receptor
Melanocortin receptor agonists bremelanotide
NMDA receptor
NMDA receptor antagonists ethanol, ketamine, PCP, DXM, Nitrous Oxide, glutamate, memantine (used for moderate to severe Alzheimers)
GHB receptor
GHB receptor agonists GHB, Amisulpride, T-HCA
Sigma receptor
Sigma-1 receptor agonists cocaine, DMT, DXM, fluvoxamine, ibogaine, opipramol, PCP, methamphetamine
Sigma-2 receptor agonists methamphetamine
Opioid receptor
μ-opioid receptor agonists morphine, heroin, oxycodone, codeine
μ-opioid receptor partial agonists buprenorphine
μ-opioid receptor inverse agonists naloxone
μ-opioid receptor antagonists naltrexone
κ-opioid receptor agonists salvinorin A, butorphanol, nalbuphine, pentazocine, ibogaine[50]
κ-opioid receptor antagonists buprenorphine
Histamine receptor
H1 histamine receptor antagonists diphenhydramine, doxylamine, mirtazapine, mianserin, quetiapine, olanzapine, meclozine, dimenhydrinate, most tricyclics
Monoamine oxidase
Monoamine oxidase inhibitors (MAOIs) phenelzine, iproniazid, tranylcypromine, selegiline, rasagiline, moclobemide, isocarboxazid, Linezolid, benmoxin, St John's wort, coffee,[51] garlic[52]
Melatonin receptor
Melatonin receptor agonists ramelteon
Imidazoline receptor
Imidazoline receptor agonists apraclonidine, clonidine, moxonidine, rilmenidine
Orexin receptor
Orexin receptor agonists modafinil
Orexin receptor antagonists SB-334,867, SB-408,124, TCS-OX2-29, suvorexant

Addiction and dependence

Addiction and dependence glossary[53][54][55]
  • addiction – a biopsychosocial disorder characterized by persistent use of drugs (including alcohol) despite substantial harm and adverse consequences
  • addictive drug – psychoactive substances that with repeated use are associated with significantly higher rates of substance use disorders, due in large part to the drug's effect on brain reward systems
  • dependence – an adaptive state associated with a withdrawal syndrome upon cessation of repeated exposure to a stimulus (e.g., drug intake)
  • drug sensitization or reverse tolerance – the escalating effect of a drug resulting from repeated administration at a given dose
  • drug withdrawal – symptoms that occur upon cessation of repeated drug use
  • physical dependence – dependence that involves persistent physical–somatic withdrawal symptoms (e.g., fatigue and delirium tremens)
  • psychological dependence – dependence socially seen as being extremely mild compared to physical dependence (e.g., with enough willpower it could be overcome)
  • reinforcing stimuli – stimuli that increase the probability of repeating behaviors paired with them
  • rewarding stimuli – stimuli that the brain interprets as intrinsically positive and desirable or as something to approach
  • sensitization – an amplified response to a stimulus resulting from repeated exposure to it
  • substance use disorder – a condition in which the use of substances leads to clinically and functionally significant impairment or distress
  • tolerance – the diminishing effect of a drug resulting from repeated administration at a given dose
Comparison of the perceived harm for various psychoactive drugs from a poll among medical psychiatrists specialized in addiction treatment (David Nutt et al. 2007).[56]

Psychoactive drugs are often associated with addiction or drug dependence. Dependence can be divided into two types: psychological dependence, by which a user experiences negative psychological or emotional withdrawal symptoms (e.g., depression) and physical dependence, by which a user must use a drug to avoid physically uncomfortable or even medically harmful physical withdrawal symptoms.[57] Drugs that are both rewarding and reinforcing are addictive; these properties of a drug are mediated through activation of the mesolimbic dopamine pathway, particularly the nucleus accumbens. Not all addictive drugs are associated with physical dependence, e.g., amphetamine, and not all drugs that produce physical dependence are addictive drugs, e.g., caffeine.

Many professionals, self-help groups, and businesses specialize in drug rehabilitation, with varying degrees of success, and many parents attempt to influence the actions and choices of their children regarding psychoactives.[58]

Common forms of rehabilitation include psychotherapy, support groups and pharmacotherapy, which uses psychoactive substances to reduce cravings and physiological withdrawal symptoms while a user is going through detox. Methadone, itself an opioid and a psychoactive substance, is a common treatment for heroin addiction, as is another opioid, buprenorphine. Recent research on addiction has shown some promise in using psychedelics such as ibogaine to treat and even cure drug addictions, although this has yet to become a widely accepted practice.[59][60]

Legality

Historical image of legal heroin bottle

The legality of psychoactive drugs has been controversial through most of recent history; the Second Opium War and Prohibition are two historical examples of legal controversy surrounding psychoactive drugs. However, in recent years, the most influential document regarding the legality of psychoactive drugs is the Single Convention on Narcotic Drugs, an international treaty signed in 1961 as an Act of the United Nations. Signed by 73 nations including the United States, the USSR, India, and the United Kingdom, the Single Convention on Narcotic Drugs established Schedules for the legality of each drug and laid out an international agreement to fight addiction to recreational drugs by combatting the sale, trafficking, and use of scheduled drugs.[61] All countries that signed the treaty passed laws to implement these rules within their borders. However, some countries that signed the Single Convention on Narcotic Drugs, such as the Netherlands, are more lenient with their enforcement of these laws.[62]

In the United States, the Food and Drug Administration (FDA) has authority over all drugs, including psychoactive drugs. The FDA regulates which psychoactive drugs are over the counter and which are only available with a prescription.[63] However, certain psychoactive drugs, like alcohol, tobacco, and drugs listed in the Single Convention on Narcotic Drugs are subject to criminal laws. The Controlled Substances Act of 1970 regulates the recreational drugs outlined in the Single Convention on Narcotic Drugs.[64] Alcohol is regulated by state governments, but the federal National Minimum Drinking Age Act penalizes states for not following a national drinking age.[65] Tobacco is also regulated by all fifty state governments.[66] Most people accept such restrictions and prohibitions of certain drugs, especially the "hard" drugs, which are illegal in most countries.[67][68][69]

In the medical context, psychoactive drugs as a treatment for illness is widespread and generally accepted. Little controversy exists concerning over the counter psychoactive medications in antiemetics and antitussives. Psychoactive drugs are commonly prescribed to patients with psychiatric disorders. However, certain critics believe that certain prescription psychoactives, such as antidepressants and stimulants, are overprescribed and threaten patients' judgement and autonomy.[70][71]

Highly known psychoactive drugs

This is a list of very well known drugs that are psychoactive. They are both legal and illegal drugs depending on which country.

See also

References

Notes
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External links