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Amphetamine is a [[methyl]] [[homologous series|homologue]] of the mammalian neurotransmitter [[phenethylamine]] with the chemical formula {{chemical formula|C|9|H|13|N}}. The carbon atom adjacent to the [[amino]] group is a [[stereogenic center]], hence amphetamine is composed of a [[racemic]] 1:1 mixture of two [[enantiomeric]] mirror images.<ref name="DrugBank1" /> This racemic mixture can be separated into its [[Enantiomer|optical isomers]]:{{#tag:ref|Enantiomers are molecules that are ''mirror images'' of one another; they are structurally identical, but of the opposite orientation.|group = "note"}} [[levoamphetamine]] and [[dextroamphetamine]].<ref name="DrugBank1" /> Physically, at room temperature, the pure [[free base]] of amphetamine is a mobile, colorless, and [[Volatility (chemistry)|volatile]] [[liquid]] with a characteristically strong [[amine]] odor, and acrid, burning taste.<ref name="Properties">{{cite web | title=Amphetamine | url=http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=3007#x27 | work=PubChem Compound | publisher = National Center for Biotechnology Information | accessdate=13 October 2013 | section=Chemical and Physical Properties }}</ref> Frequently prepared salts of amphetamine are solids and include amphetamine aspartate,<ref name="FDA Abuse & OD" /> hydrochloride,<ref>{{cite web | title=Amphetamine Hydrochloride | url=http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=92939 | work = Pubchem Compound | publisher = National Center for Biotechnology Information | accessdate = 8 November 2013}}</ref> phosphate,<ref>{{cite web | title=Amphetamine Phosphate | url=http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=62885 | work=Pubchem Compound | publisher = National Center for Biotechnology Information | accessdate=8 November 2013}}</ref> saccharate,<ref name="FDA Abuse & OD" /> and sulfate,<ref name="FDA Abuse & OD" /> the last of which is the most common amphetamine salt.<ref name="EMC" /> Amphetamine is also the parent compound of [[Substituted amphetamine|its own structural class]], which includes a number of psychoactive [[derivative (chemistry)|derivatives]].<ref name="DrugBank1" /> In organic chemistry, amphetamine is an excellent [[chiral ligand]] for the [[stereoselective synthesis]] of {{nowrap|[[1,1'-bi-2-naphthol]]}}.<ref name="Chiral Ligand">{{cite journal | author = Brussee J, Jansen ACA | year = 1983 | title = A highly stereoselective synthesis of s(-)-[1,1′-binaphthalene]-2,2′-diol | journal = Tetrahedron Lett. | volume = 24 | issue = 31 | pages = 3261&ndash;3262 | doi = 10.1016/S0040-4039(00)88151-4 }}</ref>
Amphetamine is a [[methyl]] [[homologous series|homologue]] of the mammalian neurotransmitter [[phenethylamine]] with the chemical formula {{chemical formula|C|9|H|13|N}}. The carbon atom adjacent to the [[primary amine]] is a [[stereogenic center]], hence amphetamine is composed of a [[racemic]] 1:1 mixture of two [[enantiomeric]] mirror images.<ref name="DrugBank1" /> This racemic mixture can be separated into its [[Enantiomer|optical isomers]]:{{#tag:ref|Enantiomers are molecules that are ''mirror images'' of one another; they are structurally identical, but of the opposite orientation.|group = "note"}} [[levoamphetamine]] and [[dextroamphetamine]].<ref name="DrugBank1" /> Physically, at room temperature, the pure [[free base]] of amphetamine is a mobile, colorless, and [[Volatility (chemistry)|volatile]] [[liquid]] with a characteristically strong [[amine]] odor, and acrid, burning taste.<ref name="Properties">{{cite web | title=Amphetamine | url=http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=3007#x27 | work=PubChem Compound | publisher = National Center for Biotechnology Information | accessdate=13 October 2013 | section=Chemical and Physical Properties }}</ref> Frequently prepared salts of amphetamine are solids and include amphetamine aspartate,<ref name="FDA Abuse & OD" /> hydrochloride,<ref>{{cite web | title=Amphetamine Hydrochloride | url=http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=92939 | work = Pubchem Compound | publisher = National Center for Biotechnology Information | accessdate = 8 November 2013}}</ref> phosphate,<ref>{{cite web | title=Amphetamine Phosphate | url=http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=62885 | work=Pubchem Compound | publisher = National Center for Biotechnology Information | accessdate=8 November 2013}}</ref> saccharate,<ref name="FDA Abuse & OD" /> and sulfate,<ref name="FDA Abuse & OD" /> the last of which is the most common amphetamine salt.<ref name="EMC" /> Amphetamine is also the parent compound of [[Substituted amphetamine|its own structural class]], which includes a number of psychoactive [[derivative (chemistry)|derivatives]].<ref name="DrugBank1" /> In organic chemistry, amphetamine is an excellent [[chiral ligand]] for the [[stereoselective synthesis]] of {{nowrap|[[1,1'-bi-2-naphthol]]}}.<ref name="Chiral Ligand">{{cite journal | author = Brussee J, Jansen ACA | year = 1983 | title = A highly stereoselective synthesis of s(-)-[1,1′-binaphthalene]-2,2′-diol | journal = Tetrahedron Lett. | volume = 24 | issue = 31 | pages = 3261&ndash;3262 | doi = 10.1016/S0040-4039(00)88151-4 }}</ref>


===Derivatives===
===Derivatives===

Revision as of 06:00, 21 February 2014

This article is about the free base and salts of amphetamine. For other uses, see Amphetamine (disambiguation).

Amphetamine
An image of the amphetamine compound
A 3d image of the amphetamine compound
Clinical data
Other namesα-methylphenethylamine
AHFS/Drugs.comamphetamine
License data
Dependence
liability		Moderate
Routes of
administration		Medical: oral, nasal inhalation
Recreational: oral, nasal inhalation, insufflation, rectal, intravenous
ATC code
Legal status
Legal status
Pharmacokinetic data
BioavailabilityRectal 95–100%; Oral 75–100%[2]
Protein binding15–40%[3]
MetabolismHepatic: CYP2D6[4] and FMO[5]
Elimination half-lifeD-amph:9–11h;[4] L-amph:11–14h[4]
ExcretionRenal; pH-dependent range: 1–75%[4]
Identifiers
  • (RS)-1-phenylpropan-2-amine
    (RS)-1-phenyl-2-aminopropane
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
NIAID ChemDB
PDB ligand
CompTox Dashboard (EPA)
ECHA InfoCard100.005.543 Edit this at Wikidata
Chemical and physical data
FormulaC9H13N
Molar mass135.2084 g/mol g·mol−1
3D model (JSmol)
Density0.9±0.1 g/cm3
Melting point11.3 °C (52.3 °F) [6]
Boiling point203 °C (397 °F) [7]
  • NC(C)Cc1ccccc1
  • InChI=1S/C9H13N/c1-8(10)7-9-5-3-2-4-6-9/h2-6,8H,7,10H2,1H3 checkY
  • Key:KWTSXDURSIMDCE-UHFFFAOYSA-N checkY
  (verify)

Amphetamine[note 1] ( /æmˈfɛtəmin/ ⓘ; contracted from alpha‑methylphenethylamine) is a potent central nervous system (CNS) stimulant of the phenethylamine class that is used in the treatment of attention deficit hyperactivity disorder (ADHD) and narcolepsy. Amphetamine was discovered in 1887 and exists as two enantiomers: levoamphetamine and dextroamphetamine.[note 2] Amphetamine properly refers to the racemic free base, or equal parts of the enantiomers levoamphetamine and dextroamphetamine in their pure amine forms. Nonetheless, the term is frequently used informally to refer to any combination of the enantiomers, or to either of them alone. Historically, it has been used to treat nasal congestion, depression, and obesity. Amphetamine is also used as a performance and cognitive enhancer, and recreationally as an aphrodisiac and euphoriant. It is a prescription medication in many countries, and unauthorized possession and distribution of amphetamine is often tightly controlled due to the significant health risks associated with uncontrolled or heavy use. Amphetamine is illegally synthesized by clandestine chemists, trafficked, and sold. Based upon the quantity of seized and confiscated drugs and drug precursors, illicit amphetamine production and trafficking is much less prevalent than that of methamphetamine.[ref-note 1]

The first pharmaceutical amphetamine was Benzedrine, a brand of inhalers used to treat a variety of conditions. Presently, it is typically prescribed as Adderall,[note 3] dextroamphetamine, or the inactive prodrug lisdexamfetamine. Amphetamine, through activation of a trace amine receptor, increases biogenic amine and excitatory neurotransmitter activity in the brain, with its most pronounced effects targeting the catecholamine neurotransmitters norepinephrine and dopamine. At therapeutic doses, this causes emotional and cognitive effects such as euphoria, change in libido, increased arousal, and improved cognitive control. It induces physical effects such as decreased reaction time, fatigue resistance, and increased muscle strength.[ref-note 2]

Much larger doses of amphetamine are likely to impair cognitive function and induce rapid muscle breakdown. Substance dependence (i.e., addiction) is a serious risk of amphetamine abuse, but only rarely arises from medical use. Very high doses can result in a psychosis (e.g., delusions and paranoia) which rarely occurs at therapeutic doses even during long-term use. Recreational doses are generally much larger than prescribed therapeutic doses, and carry a far greater risk of serious side effects.[ref-note 3]

Amphetamine is the parent compound of its own structural class, the substituted amphetamines,[note 4] which includes prominent substances such as bupropion, cathinone, ecstasy, and methamphetamine. Unlike methamphetamine, amphetamine's salts lack sufficient volatility to be smoked. Amphetamine is also chemically related to the naturally occurring trace amines, specifically phenethylamine and N-methylphenethylamine, both of which are produced within the human body.[ref-note 4]

Uses

See also: Adderall, Dextroamphetamine, and Lisdexamfetamine

Medical

See also: Attention deficit hyperactivity disorder and Narcolepsy

Amphetamine is generally used to treat attention deficit hyperactivity disorder (ADHD) and narcolepsy, and has historically been used as a treatment for depression, obesity, and nasal congestion.[18][22] Long-term amphetamine exposure in some species is known to produce abnormal dopamine system development or nerve damage, but humans experience normal development and nerve growth.[31][32][33] Systematic reviews of magnetic resonance imaging studies suggest that long-term treatment with amphetamine can decrease the abnormalities of brain structure and function found in subjects with ADHD, and give improvement in function of the right caudate nucleus.[32][33]

Reviews of clinical stimulant research have established the safety and effectiveness of long-term amphetamine use for ADHD.[34][35] In an evidence review by Gordon Millichap, the author noted the findings of a randomized controlled trial of amphetamine treatment for ADHD in Swedish children following 9 months of amphetamine use.[36] During treatment, the children experienced improvements in attention, disruptive behaviors, and hyperactivity, and an average change of +4.5 in IQ.[36] He noted that the population in the study had a high incidence of comorbid disorders associated with ADHD[36] and suggested that other long-term amphetamine trials with less comorbidity could find greater functional improvements.[36]

Current models of ADHD suggest that it is associated with functional impairments in some of the brain's neurotransmitter systems,[note 5] particularly those involving dopamine and norepinephrine.[37] Psychostimulants like methylphenidate and amphetamine are used to treat ADHD because they increase neurotransmitter activity in these systems.[37] Approximately 70% of those who use these stimulants see improvements in ADHD symptoms.[38] Children with ADHD who use stimulant medications generally have better relationships with peers and family members.[34][38] They also generally perform better in school, are less distractible and impulsive, and have longer attention spans.[34][38] The Cochrane Collaboration's review[note 6] on the treatment of adult ADHD with amphetamines stated that amphetamines improve short-term symptoms, but have higher discontinuation rates than non-stimulant medications due to their adverse effects.[40] Adderall has a lower discontinuation rate than other amphetamine mixtures.[40]

A Cochrane Collaboration review on the treatment of ADHD in children with comorbid tic disorders indicated that stimulants in general do not exacerbate tics, but high therapeutic doses of dextroamphetamine in such people should be avoided.[41] Other Cochrane reviews on the use of amphetamine for improving recovery following stroke or acute brain injury indicated that it may improve recovery, but further research is needed to confirm this.[42][43][44]

Enhancing performance

Therapeutic doses of psychostimulants, including amphetamine, improve performance on working memory tests both in normal functioning subjects and those with ADHD by increasing cortical network efficiency.[15] These stimulants increase arousal and, within the nucleus accumbens, improve task saliency.[15] Stimulants improve performance on difficult and boring tasks.[15] Consequently, amphetamine is used by some college and high-school students as a study and test-taking aid.[45] Based upon studies of self-reported illicit stimulant use among college students, performance-enhancing use, as opposed to abuse as a recreational drug, is the primary reason that students use stimulants.[46] At doses much higher than those medically prescribed, stimulants can interfere with working memory and cognitive control.[15]

Amphetamine is also used by some athletes for its psychological and performance-enhancing effects.[14][28][47] In competitive sports, this form of use is prohibited by anti-doping regulations.[14] In healthy people at oral therapeutic doses, amphetamine has been shown to increase physical strength,[14][48] acceleration,[14][48] stamina,[14][49] and endurance,[14][49] while reducing reaction time.[14] Like methylphenidate and bupropion, amphetamine increases stamina and endurance in humans primarily through reuptake inhibition and effluxion of dopamine in the central nervous system.[48][49] Similar to cognition enhancement, very high amphetamine doses can induce side effects that impair athletic performance, such as rhabdomyolysis and hyperthermia.[13][24][48]

Contraindications

The United States Food and Drug Administration (USFDA)[note 7] states that amphetamine is contraindicated in people with a history of drug abuse, heart disease, or severe agitation or anxiety, or in those currently experiencing arteriosclerosis, glaucoma, hyperthyroidism, or severe hypertension.[50] People who have experienced hypersensitivity reactions to other stimulants in the past or are currently taking monoamine oxidase inhibitors (MAOIs) are advised not to take amphetamine.[50] The USFDA advises anyone with bipolar disorder, depression, elevated blood pressure, liver or kidney problems, mania, psychosis, Raynaud's phenomenon, seizures, thyroid problems, tics, or Tourette syndrome to monitor their symptoms while taking amphetamine.[50] Amphetamine is classified in US pregnancy category C.[50] This means that detriments to the fetus have been observed in animal studies and adequate human studies have not been conducted; amphetamine may still be prescribed to pregnant women if the potential benefits outweigh the risks.[51] Amphetamine has also been shown to pass into breast milk, so the USFDA advises mothers to avoid breastfeeding when using it.[50] Due to the potential for stunted growth, the USFDA advises monitoring the height and weight of growing children and adolescents during treatment.[50]

Side effects

Side effects of amphetamine are varied, and the amount of amphetamine consumed is the primary factor in determining the likelihood and severity of side effects.[13][24][28] Amphetamine products such as Adderall, Dexedrine, and their generic equivalents are currently approved by the United States Food and Drug Administration (USFDA) for long-term therapeutic use.[24][52] Recreational use of amphetamine generally involves far larger doses and therefore a much greater risk of serious side effects.[28]

Physical

At normal therapeutic doses, the physical side effects of amphetamine vary widely by age and among individual people.[24] Cardiovascular side effects can include irregular heartbeat (usually increased heart rate), hypertension (high blood pressure) or hypotension (low blood pressure) from a vasovagal response, and Raynaud's phenomenon.[24][28][53] Sexual side effects in males may include erectile dysfunction, frequent erections, or prolonged erections. Other potential side effects include abdominal pain, acne, blurred vision, excessive grinding of the teeth, profuse sweating, dry mouth, loss of appetite, nausea, reduced seizure threshold, tics, and weight loss.[24][28][53] Dangerous physical side effects are rare in typical pharmaceutical doses.[28]

Amphetamine stimulates the medullary respiratory centers, which increases the rate of respiration and produces deeper breaths.[28] In a normal person at therapeutic doses, amphetamine does not noticeably increase the rate of respiration or produce deeper breaths, but when respiration is already compromised, it may stimulate respiration.[28] Amphetamine also induces contraction in the urinary bladder sphincter, which can result in difficulty urinating; this effect can be useful in treating enuresis and incontinence.[28] The effects of amphetamine on the gastrointestinal tract are unpredictable.[28] Amphetamine may reduce gastrointestinal motility if intestinal activity is high, or increase motility if the smooth muscle of the tract are relaxed.[28] Amphetamine also has a slight analgesic effect and can enhance the analgesia of opiates.[28]

Recent studies by the USFDA indicate that, in children, young adults, and adults, there is no association between serious adverse cardiovascular events (sudden death, myocardial infarction, and stroke) and the medical use of amphetamine or other ADHD stimulants.[ref-note 5]

Psychological

Common psychological effects of therapeutic doses can include alertness, apprehension, concentration, decreased sense of fatigue, mood swings (elevated mood or elation and euphoria followed by mild dysphoria), increased initiative, insomnia or wakefulness, self-confidence, and sociability.[24][28] Less common or rare psychological effects that depend on the user's personality and current mental state include anxiety, change in libido, grandiosity, irritability, repetitive or obsessive behaviors, and restlessness.[ref-note 6] When heavily abused, amphetamine psychosis can occur.[13][24][25] Although very rare, this psychosis can also occur at therapeutic doses during long-term therapy as a side effect.[13][24][26] According to the USFDA, "there is no systematic evidence that stimulants cause aggressive behavior or hostility."[24]

Overdose

An amphetamine overdose is rarely fatal with appropriate care.[59] It can lead to different symptoms.[13][24] A moderate overdose may induce symptoms including irregular heartbeat, confusion, painful urination, high or low blood pressure, hyperthermia, hyperreflexia, muscle pain, severe agitation, rapid breathing, tremor, urinary hesitancy, and urinary retention.[13][24][28] An extremely large overdose may produce symptoms such as adrenergic storm, amphetamine psychosis, anuria, cardiogenic shock, cerebral hemorrhage, circulatory collapse, edema (peripheral or pulmonary), extreme fever, pulmonary hypertension, renal failure, rapid muscle breakdown, serotonin syndrome, and stereotypy.[ref-note 7] Fatal amphetamine poisoning usually also involves convulsions and coma.[13][28]

Dependence, addiction, and withdrawal

Addiction is a serious risk with heavy recreational amphetamine use, but is unlikely to arise from typical medical use.[13][27][28] Tolerance develops rapidly in amphetamine abuse, so periods of extended use require increasing doses of the drug in order to achieve the same effect.[63][64]

A Cochrane Collaboration review on amphetamine and methamphetamine dependence and abuse indicates that the current evidence on effective treatments is extremely limited.[65] The review indicated that fluoxetine[note 8] and imipramine[note 9] have some limited benefits in treating abuse and addiction, but concluded, "no treatment has been demonstrated to be effective for the treatment of amphetamine dependence and abuse."[65] A corroborating review indicated that amphetamine dependence is mediated through increased activation of dopamine receptors and co-localized NMDA receptors in the mesolimbic pathway;[66] it also noted that magnesium ions, which inhibit NMDA receptor calcium channels, and serotonin have inhibitory effects on NMDA receptors.[66] The review also suggested that, based upon animal testing, pathological amphetamine use significantly reduces the level of intracellular magnesium throughout the brain.[66] Consequently, supplemental magnesium,[note 10] like fluoxetine treatment, has been shown to reduce self-administration in both humans and lab animals.[65][66]

There is little difference between the addictive properties of amphetamine and methamphetamine.[67] According to another Cochrane Collaboration review on withdrawal in highly dependent amphetamine and methamphetamine abusers, "when chronic heavy users abruptly discontinue amphetamine use, many report a time-limited withdrawal syndrome that occurs within 24 hours of their last dose."[68] This review noted that withdrawal symptoms in chronic, high-dose users are frequent, occurring in up to 87.6% of cases, and persist for three to four weeks with a marked "crash" phase occurring during the first week.[68] Amphetamine withdrawal symptoms can include anxiety, drug craving, dysphoric mood, fatigue, increased appetite, increased movement or decreased movement, lack of motivation, sleeplessness or sleepiness, and vivid or lucid dreams.[68] The review suggested that withdrawal symptoms are associated with the degree of dependence, suggesting that therapeutic use would result in far milder discontinuation symptoms.[68] The USFDA does not indicate the presence of withdrawal symptoms following discontinuation of amphetamine use after an extended period at therapeutic doses.[69][70][71]

Psychosis

Template:Main section

Abuse of amphetamine can result in a stimulant psychosis that may present with a variety of symptoms (e.g., paranoia, hallucinations, delusions).[25] A Cochrane Collaboration review on treatment for amphetamine, dextroamphetamine, and methamphetamine abuse-induced psychosis states that about 5–15% of users fail to recover completely.[25][72] The same review asserts that, based upon at least one trial, antipsychotic medications effectively resolve the symptoms of acute amphetamine psychosis.[25] Psychosis very rarely arises from therapeutic use.[26][50]

Toxicity

Studies conducted on rodents and primates consistently observe long-term dopaminergic neurotoxicity, or damage to dopamine neurons, with sufficiently high doses of amphetamine.[73] In humans, unlike methamphetamine which is directly neurotoxic to dopamine neurons, there is no systematic evidence of direct amphetamine neurotoxicity, even at high doses.[28][74] The primary proposed mechanism for toxicity from high-dose amphetamine use is indirect damage to dopamine terminals via autoxidation of dopamine, as opposed to direct toxicity from amphetamine.[28][75][76] On the other hand, there is in vitro evidence that amphetamine is neurogenerative and neuroprotective from increasing the activity of the psychostimulant protein cocaine and amphetamine regulated transcript (CART).[77]

Interactions

Many types of substances are known to interact with amphetamine, resulting in altered drug action or metabolism of amphetamine, the interacting substance, or both.[4][78] Since amphetamine is metabolized by the liver enzyme CYP2D6, inhibitors of this enzyme, such as fluoxetine (a selective serotonin reuptake inhibitor (SSRI)) and bupropion, will prolong the elimination half-life of amphetamine.[78] Amphetamine also interacts with MAOIsTooltip monoamine oxidase inhibitors, particularly monoamine oxidase A inhibitors, since both MAOIs and amphetamine increase plasma catecholamines; therefore, concurrent use of both is dangerous.[78] Amphetamine will modulate the activity of most psychoactive drugs. In particular, amphetamine may decrease the effects of sedatives and depressants and increase the effects of stimulants and antidepressants.[78] Amphetamine may also decrease the effects of antihypertensives and antipsychotics due to its effects on blood pressure and dopamine respectively.[78] While there is no significant effect on consuming amphetamine with food in general, the pH of gastrointestinal content and urine affects the absorption and excretion of amphetamine, respectively.[78] Specifically, acidic substances will reduce the absorption of amphetamine and increase urinary excretion, while alkaline substances do the opposite.[78] Due to the effect pH has on absorption, amphetamine also interacts with gastric acid reducers such as proton pump inhibitors and H2 antihistamines, which decrease gastrointestinal pH.[78]

Pharmacology

Pharmacodynamics

Pharmacodynamics of amphetamine enantiomers in a dopamine neuron
A pharmacodynamic model of amphetamine and TAAR1
via AADC
The image above contains clickable links
Amphetamine enters the presynaptic neuron across the neuronal membrane or through DAT. Once inside, it binds to TAAR1 or enters synaptic vesicles through VMAT2. When amphetamine binds to TAAR1, it reduces dopamine receptor firing rate and triggers protein kinase A (PKA) and protein kinase C (PKC) signaling, resulting in DAT phosphorylation. Phosphorylated DAT then either operates in reverse or withdraws into the presynaptic neuron and ceases transport. When amphetamine enters the synaptic vesicles through VMAT2, dopamine is released into the cytosol (yellow-orange area).

Amphetamine has been identified as a potent full agonist of trace amine-associated receptor 1 (TAAR1), a Gs- and Gq-coupled G protein-coupled receptor (GPCR) discovered in 2001, which is important for regulation of brain monoamines.[23][79][80] Activation of TAAR1 increases cyclic adenosine monophosphate (cAMP) production via adenylyl cyclase activation and inhibits monoamine transporter function.[23][81] Monoamine autoreceptors, such as D2 short, have the opposite effect of TAAR1, and together these receptors provide a regulatory system for monoamines.[23] Notably, amphetamine and trace amines activate TAAR1, but not monoamine autoreceptors.[23] In addition to the neuronal monoamine transporters, amphetamine also inhibits vesicular monoamine transporter 2 (VMAT2), SLC22A3, and SLC22A5.[77][82] SLC22A3 is an extraneuronal monoamine transporter that is present in astrocytes and SLC22A5 is a high-affinity carnitine transporter.[77][83] Amphetamine also mildly inhibits both the CYP2A6 and CYP2D6 liver enzymes.[79] Amphetamine is known to strongly induce CART gene expression,[77][79] a neuropeptide involved in feeding behavior, stress, and reward, which induces observable increases in neuronal development and survival in vitro.[77][84] The CART receptor has yet to be identified, but there is significant evidence that CART binds to a unique GPCR coupled to Gi/Go.[84][85] Amphetamine also inhibits monoamine oxidase B (MAO-B) at high doses, resulting in less dopamine and phenethylamine metabolism and consequently higher concentrations of synaptic monoamines.[4][8]

Amphetamine exerts its behavioral effects by modulating monoamine neurotransmission in the brain, primarily in catecholamine neurons.[23][79] The full profile of amphetamine drug effects is derived almost entirely from increasing the neurotransmission of dopamine,[23] serotonin,[23] norepinephrine,[23] epinephrine,[86] histamine,[86] CART peptides,[79] acetylcholine,[87][88] and glutamate,[89][90] which it effects through interactions with CART, TAAR1, and VMAT2.[23][79][86]

The effect of amphetamine on monoamine transporters in the brain appears to be site-specific.[23] Imaging studies indicate that monoamine reuptake inhibition by amphetamine and trace amines is dependent upon the presence of TAAR1 co-localization in the associated monoamine neurons.[23] As of 2010, co-localization of TAAR1 and the dopamine transporter (DAT) has been visualized in rhesus monkeys, but co-localization of TAAR1 with the norepinephrine transporter (NET) and the serotonin transporter (SERT) has only been evidenced by messenger RNA (mRNA) expression.[23]

The major neural systems affected by amphetamine are largely implicated in the reward and executive function pathways of the brain, collectively known as the mesocorticolimbic projection.[91] The concentrations of the primary neurotransmitters involved in reward circuitry and executive functioning, dopamine and norepinephrine, are markedly increased in a dose-dependent manner by amphetamine due to its effects on monoamine transporters.[23][86][91] The reinforcing and task saliency effects of amphetamine are mostly due to enhanced dopaminergic activity in the mesolimbic pathway.[15]

Dextroamphetamine is a more potent agonist of TAAR1 than levoamphetamine.[92] Consequently, dextroamphetamine produces greater CNS stimulation than levoamphetamine, roughly three to four times more, but levoamphetamine has slightly stronger cardiovascular and peripheral effects.[28][92]

Dopamine

In certain brain regions, amphetamine increases the concentrations of dopamine in the synaptic cleft, thereby heightening the response of the post-synaptic neuron.[23] Through a TAAR1-mediated mechanism, the firing rate of dopamine receptors decreases, preventing a hyper-dopaminergic state.[23][93] Amphetamine can can enter the presynaptic neuron either through DAT or by diffusing across the neuronal membrane directly.[23] As a consequence of DAT uptake, amphetamine produces competitive reuptake inhibition at the transporter.[23] Upon entering the presynaptic neuron, amphetamine activates TAAR1 which, through protein kinase signaling, induces DAT phosphorylation and consequently DAT internalization (non-competitive reuptake inhibition) and reverse transport (dopamine efflux).[23][94]

Amphetamine is also a substrate for the presynaptic vesicular transporter, VMAT2.[86] Following amphetamine uptake at VMAT2, the synaptic vesicle releases dopamine molecules into the cytosol in exchange.[86] Subsequently, the cytosolic dopamine molecules exit the presynaptic neuron via reverse transport at DAT.[23][86]

Norepinephrine

Similar to dopamine, amphetamine dose-dependently increases the level of synaptic norepinephrine, the direct precursor of epinephrine.[30][91] Based upon neuronal TAAR1 mRNA expression, amphetamine is thought to affect norepinephrine analogously to dopamine.[23][86][94] In other words, amphetamine induces TAAR1-mediated efflux and non-competitive reuptake inhibition at phosphorylated NET, competitive NET reuptake inhibition, and norepinephrine release from VMAT2.[23][86]

Serotonin

Amphetamine exerts analogous, yet less pronounced, effects on serotonin as on dopamine and norepinephrine.[23][91] Amphetamine affects serotonin via VMAT2 and, like norepinephrine, is thought to phosphorylate SERT via TAAR1.[23][86]

Acetylcholine

While amphetamine has no direct effect on acetylcholine, several studies have noted that it increases acetylcholine release after use.[87][88] In lab animals, high doses of amphetamine greatly increase acetylcholine levels in certain brain regions, including the hippocampus, prefrontal cortex, and nucleus accumbens.[87] In humans, this is thought to occur via a cholinergic–dopaminergic link, mediated by the neuropeptide ghrelin in the ventral tegmentum.[88] This heightened cholinergic activity leads to increased nicotinic receptor activation in the CNS, a factor which likely contributes to the nootropic effects of amphetamine.[95]

Other relevant activity

Extracellular levels of glutamate, the primary excitatory neurotransmitter in the brain, have been shown to increase upon exposure to amphetamine.[89][90] This effect was found in the mesolimbic pathway, an area of the brain implicated in reward, where amphetamine is known to affect dopamine neurotransmission.[89][90] Amphetamine also induces effluxion of histamine from synaptic vesicles in the CNS through VMAT2.[86]

Pharmacokinetics

The oral bioavailability of amphetamine varies with gastrointestinal pH;[78] it is well absorbed from the gut, and bioavailability is typically over 75% for dextroamphetamine.[2] Amphetamine is a weak base with a pKa of 9–10;[4] consequently, when the pH is basic, more of the drug is in its lipid soluble free base form, and more is absorbed through the lipid-rich cell membranes of the gut epithelium.[4][78] Conversely, an acidic pH means the drug is predominantly in a water soluble cationic (salt) form, and less is absorbed.[4] Approximately 15–40% of amphetamine circulating in the bloodstream is bound to plasma proteins.[3]

The half-life of amphetamine enantiomers differ and vary with urine pH.[4] At normal urine pH, the half-lives of dextroamphetamine and levoamphetamine are 9–11 hours and 11–14 hours, respectively.[4] An acidic diet will reduce the enantiomer half-lives to 8–11 hours, while an alkaline diet will increase the range to 16–31 hours.[96][97] The immediate-release and extended release variants of salts of both isomers reach peak plasma concentrations at 3 hours and 7 hours post-dose respectively.[4] Amphetamine is eliminated via the kidneys, with 30–40% of the drug being excreted unchanged at normal urinary pH.[4] When the urinary pH is basic, amphetamine is in its free base form, so less is excreted.[4] When urine pH is abnormal, the urinary recovery of amphetamine may range from a low of 1% to a high of 75%, depending mostly upon whether urine is too basic or acidic, respectively.[4] Amphetamine is usually eliminated within two days of the last oral dose.[96] Apparent half-life and duration of effect increase with repeated use and accumulation of the drug.[98]

CYP2D6 and flavin-containing monooxygenase are the only enzymes currently known to metabolize amphetamine in humans.[4][5][99] Amphetamine has a variety of excreted metabolic products, including 4-hydroxyamfetamine, 4-hydroxynorephedrine, 4-hydroxyphenylacetone, benzoic acid, hippuric acid, norephedrine, and phenylacetone.[4][96][100] Among these metabolites, the active sympathomimetics are 4‑hydroxyamphetamine,[101] 4‑hydroxynorephedrine,[102] and norephedrine.[103]

The main metabolic pathways involve aromatic para-hydroxylation, aliphatic alpha- and beta-hydroxylation, N-oxidation, N-dealkylation, and deamination.[4][96] The known pathways and detectable metabolites include:[4][5][100]

Metabolic pathways of amphetamine in humans[sources 1]
Graphic of several routes of amphetamine metabolism
Amphetamine
Para-
Hydroxylation
Para-
Hydroxylation
Para-
Hydroxylation
unidentified
Beta-
Hydroxylation
Beta-
Hydroxylation
Oxidative
Deamination
Oxidation
unidentified
Glycine
Conjugation
The image above contains clickable links
The primary active metabolites of amphetamine are 4-hydroxyamphetamine and norephedrine;[100] at normal urine pH, about 30–40% of amphetamine is excreted unchanged and roughly 50% is excreted as the inactive metabolites (bottom row).[4] The remaining 10–20% is excreted as the active metabolites.[4]
Further information: Trace amines and related compounds

Amphetamine has a very similar structure and function to the endogenous trace amines, which are naturally occurring molecules produced in the human body and brain.[23][30] Among this group, the most closely related compounds are phenethylamine, the parent compound of amphetamine, and N-methylphenethylamine, an isomer of amphetamine (i.e., it has an identical molecular formula).[23][30] In humans, phenethylamine is produced directly from L-phenylalanine by the aromatic amino acid decarboxylase (AADC) enzyme, which converts L-DOPA into dopamine as well.[30] In turn, N‑methylphenethylamine is metabolized from phenethylamine by phenylethanolamine N-methyltransferase, the same enzyme that metabolizes norepinephrine into epinephrine.[30] Like amphetamine, both phenethylamine and N‑methylphenethylamine regulate monoamine neurotransmission via TAAR1;[23] unlike amphetamine, both of these substances are broken down by MAO-B, and therefore have a shorter half-life than amphetamine.[30]

Physical and chemical properties

An image of amphetamine free base
A vial containing the colorless amphetamine free base
Graphical representation of Amphetamine stereoisomers
The skeletal structure of L-amph and D-amph respectively

Amphetamine is a methyl homologue of the mammalian neurotransmitter phenethylamine with the chemical formula Template:Chemical formula. The carbon atom adjacent to the primary amine is a stereogenic center, hence amphetamine is composed of a racemic 1:1 mixture of two enantiomeric mirror images.[9] This racemic mixture can be separated into its optical isomers:[note 12] levoamphetamine and dextroamphetamine.[9] Physically, at room temperature, the pure free base of amphetamine is a mobile, colorless, and volatile liquid with a characteristically strong amine odor, and acrid, burning taste.[112] Frequently prepared salts of amphetamine are solids and include amphetamine aspartate,[13] hydrochloride,[113] phosphate,[114] saccharate,[13] and sulfate,[13] the last of which is the most common amphetamine salt.[29] Amphetamine is also the parent compound of its own structural class, which includes a number of psychoactive derivatives.[9] In organic chemistry, amphetamine is an excellent chiral ligand for the stereoselective synthesis of 1,1'-bi-2-naphthol.[115]

Derivatives

For a more comprehensive list, see Substituted amphetamine.

Amphetamine derivatives, often referred to as "amphetamines" or "substituted amphetamines", are a broad range of chemicals that contain amphetamine as a "backbone".[116][117] The class includes stimulants like methamphetamine, serotonergic empathogens like MDMA (ecstasy), and decongestants like ephedrine, among other subgroups.[116][117] This class of chemicals is sometimes referred to collectively as the "amphetamine family."[118]

Detection in body fluids

Amphetamine is frequently measured in urine or blood as part of a drug test for sports, employment, poisoning diagnostics, and forensics.[ref-note 8] Techniques such as immunoassay, which is the most common form of amphetamine test, may cross-react with a number of sympathomimetic drugs.[122] Chromatographic methods specific for amphetamine are employed to prevent false positive results.[123] Chiral-separation techniques may be employed to help distinguish the source of the drug, whether obtained legally from prescription amphetamine itself, prescription amphetamine prodrugs, (e.g., selegiline), and over-the-counter drug products (e.g., Vicks Vapoinhaler) or from illicitly obtained substituted amphetamines.[123][124][125] Several prescription drugs produce amphetamine as a metabolite, including benzphetamine, clobenzorex, famprofazone, fenproporex, lisdexamfetamine, mesocarb, methamphetamine, prenylamine, and selegiline, among others.[18][126][127] These compounds may produce positive results for amphetamine on drug tests.[126][127] Amphetamine is generally only detectable by a standard drug test for approximately 24 hours, although a high dose may be detectable for two to four days.[122]

For the assays, a study noted that an enzyme multiplied immunoassay technique (EMIT) assay for amphetamine and methamphetamine may produce a large number of false positives when compared with samples confirmed by liquid chromatography–tandem mass spectrometry.[124] Gas chromatography–mass spectrometry (GC–MS) of amphetamine and methamphetamine with the derivatizing agent (S)-(−)-trifluoroacetylprolyl chloride allows for the detection of methamphetamine in urine.[123] In comparison, GC–MS of amphetamine and methamphetamine with the chiral derivatizing agent Mosher's acid chloride allows for the detection both of dextroamphetamine and dextromethamphetamine in urine.[123] Hence, the latter method may be used on samples that test positive using other methods to help distinguish between the aforementioned forms of legal and illicit drug use.[123]

Synthesis

Amphetamine can be synthesized by Knoevenagel condensation of benzaldehyde with nitroethane, followed by reduction of the double bond and nitro group through either catalytic hydrogenation or by treatment with lithium aluminium hydride.[128][129] Another method is the reaction of phenylacetone with ammonia, producing an imine intermediate that is reduced to the primary amine using hydrogen over a palladium catalyst or lithium aluminium hydride.[129] A third method, the most common route of both legal and illicit amphetamine synthesis, employs a non-metal reduction known as the Leuckart reaction.[29][129] In the first step, a reaction between phenylacetone and formamide, either using additional formic acid or formamide itself as a reducing agent, yields the synthetic intermediate N-formylamphetamine.[129][130] This intermediate is then hydrolysed using hydrochloric acid, and subsequently basified, extracted with organic solvent, concentrated, and distilled to yield the free base.[129] The free base is then dissolved in an organic solvent, sulfuric acid added, and amphetamine precipitates out as the sulfate salt.[129]

Amphetamine synthesis routes
Diagram of amphetamine synthesis by Knoevenagel condensation
Method 1: Amphetamine synthesis by Knoevenagel condensation (R2–R6 = H for amphetamine itself)
Diagram of amphetamine synthesis from phenylacetone and ammonia
Method 2: Amphetamine synthesis using phenylacetone and ammonia
Diagram of amphetamine synthesis by the Leuckart reaction
Method 3: Amphetamine synthesis by the Leuckart reaction

History, society, and culture

Main article: History and culture of substituted amphetamines

Amphetamine was first synthesized in 1887 in Germany by Romanian chemist Lazăr Edeleanu who named it phenylisopropylamine;[131][132][133] its stimulant effects remained unknown until 1927, when it was independently resynthesized by Gordon Alles and reported to have sympathomimetic properties.[133] Amphetamine had no pharmacological use until 1934, when Smith, Kline and French began selling it as an inhaler under the trade name Benzedrine as a decongestant.[19] During World War II, amphetamines and methamphetamine were used extensively by both the Allied and Axis forces for their stimulant and performance-enhancing effects.[132][134][135] Eventually, as the addictive properties of the drug became known, governments began to place strict controls on the sale of amphetamine.[132] For example, during the early 1970s in the United States, amphetamine became a schedule II controlled substance under the Controlled Substances Act.[136] In spite of strict government controls, amphetamine has still been used legally or illicitly by people from a variety of backgrounds, including authors,[137] musicians,[138] mathematicians,[139] and athletes.[14]

As a result of the United Nations Convention on Psychotropic Substances, amphetamine became a schedule II controlled substance, as defined in the treaty, in all (183) state parties.[12] Consequently, it is heavily regulated in most countries.[140][141] Some countries, such as South Korea and Japan, have banned substituted amphetamines even for medical use.[142][143] In other nations, such as Canada (schedule I drug),[144] the United States (schedule II drug),[13] Thailand (category 1 narcotic),[145] and United Kingdom (class B drug),[146] amphetamine is in a restrictive national drug schedule that allows for its use as a medical treatment.[17][20]

Pharmaceutical products

The most commonly prescribed amphetamine formulation that contains both enantiomers is Adderall.[note 3][9] Amphetamine is also prescribed in enantiopure and prodrug form respectively as dextroamphetamine and lisdexamfetamine.[21][147] Lisdexamfetamine is structurally different from amphetamine, but is inactive until it metabolizes into dextroamphetamine.[147] The free base of racemic amphetamine was previously available as Benzedrine, Psychedrine, and Sympatedrine.[9][18] Levoamphetamine was also previously available as Cydril.[18] All currently available pharmaceutical products are salts of amphetamine due to the comparatively high volatility of the amphetamine free base.[18][21][29] Some of the currently available brands and their generic equivalents are listed below.

Amphetamine pharmaceuticals
Brand
name 		United States
Adopted Name 		(D:L) ratio
of salts 		Dosage
form 		Source
Adderall – 3:1 tablet [18][21]
Adderall XR – 3:1 capsule [18][21]
Dexedrine dextroamphetamine sulfate 1:0 capsule [18][21]
ProCentra dextroamphetamine sulfate 1:0 tablet [21]
Vyvanse lisdexamfetamine dimesylate 1:0 capsule [18][147]
Zenzedi dextroamphetamine sulfate 1:0 liquid [21]
 
An image of the lisdexamphetamine compound
The skeletal structure of lisdexamfetamine

Notes

  1. ^ Synonyms and alternate spellings include: α-methylphenethylamine, amfetamine (International Nonproprietary Name [INN], British Approved Name [BAN]), β-phenylisopropylamine, speed, 1-phenylpropan-2-amine, α-methylbenzeneethanamine, and desoxynorephedrine.[8][9][10]
  2. ^ Enantiomers are molecules that are mirror images of one another; they are structurally identical, but of the opposite orientation.
    Levoamphetamine and dextroamphetamine are also known as L-amph or levamfetamine (INN) and D-amph or dexamfetamine (INN) respectively.[8]
  3. ^ a b "Adderall" is a brand name as opposed to a nonproprietary name; because the latter ("dextroamphetamine sulfate, dextroamphetamine saccharate, amphetamine sulfate, and amphetamine aspartate"[21]) is excessively long, this article exclusively refers to this amphetamine mixture by the brand name.
  4. ^ Due to confusion that may arise from use of the plural form, this article will only use the terms "amphetamine" and "amphetamines" to refer to racemic amphetamine, levoamphetamine, and dextroamphetamine and reserve the term "substituted amphetamines" for the class.
  5. ^ This involves impaired dopamine neurotransmission in the mesocortical and mesolimbic pathways and norepinephrine neurotransmission in the prefrontal cortex and locus coeruleus.[37]
  6. ^ Cochrane Collaboration reviews are high quality meta-analytic systematic reviews of randomized controlled trials.[39]
  7. ^ The prescribing information in a package insert is the property of the manufacturer, but the final version is approved by the USFDA. For simplicity, this section will refer to the USFDA, since multiple versions of the amphetamine prescribing information exist.
  8. ^ During short-term treatment, fluoxetine may decrease drug craving.[65]
  9. ^ During "medium-term treatment," imipramine may extend the duration of adherence to addiction treatment.[65]
  10. ^ The review indicated that magnesium L-aspartate and magnesium chloride produce significant changes in addictive behavior;[66] other forms of magnesium were not mentioned.
  11. ^ 4-Hydroxyamphetamine has been shown to be metabolized into 4-hydroxynorephedrine by dopamine beta-hydroxylase (DBH) in vitro and it is presumed to be metabolized similarly in vivo.[104][107] Evidence from studies that measured the effect of serum DBH concentrations on 4-hydroxyamphetamine metabolism in humans suggests that a different enzyme may mediate the conversion of 4-hydroxyamphetamine to 4-hydroxynorephedrine;[107][109] however, other evidence from animal studies suggests that this reaction is catalyzed by DBH in synaptic vesicles within noradrenergic neurons in the brain.[110][111]
  12. ^ Enantiomers are molecules that are mirror images of one another; they are structurally identical, but of the opposite orientation.

Reference notes

  1. ^ [11][12][13][14][15][16][17][18][19][20]
  2. ^ [14][15][16][18][19][22][23][24]
  3. ^ [13][15][25][26][27][28]
  4. ^ [29][30]
  5. ^ [54][55][56][57]
  6. ^ [16][24][28][58]
  7. ^ [13][24][28][58][60][61][62]
  8. ^ [14][119][120][121]

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