Medical cannabis, or medical marijuana, refers to the use of cannabis and its cannabinoids to treat disease or improve symptoms. Cannabis has is used to reduce nausea and vomiting during chemotherapy, to improve appetitie in people with HIV/AIDS, and to treat chronic pain and muscle spasms. Its use for other medical applications is insufficient for conclusions about safety or efficacy.
Short-term use increases both minor and major adverse effects. Common side effects include dizziness, feeling tired, vomiting, and hallucinations. Long-term effects of cannabis are not clear. Concerns include memory and cognition problems, risk of addiction, schizophrenia in young people, and the risk of children taking it by accident.
The Cannabis plant has a history of medicinal use dating back thousands of years across many cultures. Its current use is controversial. The American Medical Association, the Minnesota Medical Association, the American Society of Addiction Medicine, and other medical organizations have issued statements opposing its use for medicinal purposes. The American Academy of Pediatrics states that while cannabinoids may have potential as therapy for a number of medical conditions, they do not recommend it until more research is done. They, along with the American Medical Association and the Minnesota Medical Association, call for moving cannabis out of DEA Schedule I to facilitate this research.
Medical cannabis can be administered using a variety of methods, including vaporizing or smoking dried buds, eating extracts, taking capsules or using oral sprays. Synthetic cannabinoids are available as prescription drugs in some countries; examples include: dronabinol and nabilone. Recreational use of cannabis is illegal in most parts of the world, but the medical use of cannabis is legal in certain countries, including Austria, Canada, Czech Republic, Finland, Germany, Israel, Italy, the Netherlands, Portugal and Spain. In the United States, federal law outlaws all cannabis use, while 20 states and the District of Columbia no longer prosecute individuals for the possession or sale of marijuana, as long as the individuals are in compliance with the state's marijuana sale regulations. However, an appeals court ruled in January 2014 that a 2007 Ninth Circuit ruling remains binding in relation to the ongoing illegality, in federal legislative terms, of Californian cannabis dispensaries, reaffirming the impact of the federal Controlled Substances Act.
- 1 Medical uses
- 2 Adverse effects
- 3 Pharmacology
- 4 History
- 5 Society and culture
- 6 Research
- 7 See also
- 8 References
- 9 Further reading
- 10 External links
Medical cannabis has several potential beneficial effects. Evidence is moderate that it helps in chronic pain and muscles spasms. Lesser evidence supports its use to help with nausea during chemotherapy, improve appetite in those with HIV/AIDS, help with sleep, and help with Tourettes syndrome.
The National Institute on Drug Abuse (NIDA) states that cannabis is unlikely to be useful as medicine as "(1) it is an unpurified plant containing numerous chemicals with unknown health effects; (2) it is typically consumed by smoking further contributing to potential adverse effects; and (3) its cognitive impairing effects may limit its utility." Due to risks and little evidence supporting its use the American Society of Addiction Medicine in March 2011 recommending a halt on use of marijuana as medication in the United States, even in states where it had been declared legal. It is recommended that cannibis use be stopped in pregnancy.
Nausea and vomiting
Medical cannabis is somewhat effective in chemotherapy-induced nausea and vomiting (CINV) and may be a reasonable option in those who do not improve following preferential treatment. Comparative studies have found cannabinoids to be more effective than some conventional antiemetics such as prochlorperazine, promethazine, and metoclopramide in controlling CINV, but these are used less frequently because of side effects including dizziness, dysphoria, and hallucinations. Long-term cannabis use may cause nausea and vomiting, a condition known as cannabinoid hyperemesis syndrome.
A 2010 Cochrane review said that cannabinoids were "probably effective" in treating chemotherapy-induced nausea in children, but with a high side effect profile (mainly drowsiness, dizziness, altered moods, and increased appetite). Less common side effects were "occular problems, orthostatic hypotension, muscle twitching, pruritis, vagueness, hallucinations, lightheadedness and dry mouth".
Evidence is lacking for both efficacy and safety of cannabis and cannabinoids in treating patients with HIV/AIDS or for anorexia associated with AIDS. As of 2013, current studies suffer from effects of bias, small sample size, and lack of long-term data.
Cannabis appears to be somewhat effective for the treatment of chronic pain, including pain caused by neuropathy and possibly that due to fibromyalgia and rheumatoid arthritis. A 2009 review states it was unclear if the benefits were greater than the risks, while a 2011 review considered it generally safe for this use. In palliative care the use appears safer than that of opioids. A 2014 review found limited and weak evidence that smoked cannabis was effective for chronic non-cancer pain. The review recommended that it be used for people for whom cannabinoids and other analgesics were not effective. A 2015 review found moderate quality evidence that cannabinoids were effective for chronic pain.
The efficacy of cannabis in treating neurological problems, including multiple sclerosis, epilepsy, and movement problems, is not clear. Studies of the efficacy of cannabis for treating multiple sclerosis have produced varying results. The combination of Δ9-tetrahydrocannabinol (THC) and cannabidiol (CBD) extracts give subjective relief of spasticity, though objective post-treatment assessments do not reveal significant changes. Evidence also suggests that oral cannabis extract is effective for reducing patient-centered measures of spasticity. A trial of cannabis is deemed to be a reasonable option if other treatments have not been effective. Its use for MS is approved in ten countries. A 2012 review found no problems with tolerance, abuse or addiction.
Smoking is the means of administration of cannabis for many consumers, and the most common method of medical cannabis consumption in the US as of 2013. It is difficult to predict the pharmacological response to cannabis because concentration of cannabinoids varies widely as there are different ways of preparing cannabis for consumption (smoked, applied as oils, eaten, infused into other foods, or drunk) and a lack of production controls. The potential for adverse effects from smoke inhalation makes smoking a less viable option than oral preparations.
Cannabinoid medicines are available in pill form (dronabinol and nabilone) and liquid extracts formulated into an oromucosal spray (nabiximols). Oral preparations are "problematic due to the uptake of cannabinoids into fatty tissue, from which they are released slowly, and the significant first-pass liver metabolism, which breaks down Δ9THC and contributes further to the variability of plasma concentrations".
The U.S. Food and Drug Administration (FDA) has not approved smoked cannabis for any condition or disease as it deems evidence is lacking concerning safety and efficacy of cannabis for medical use. The FDA issued a 2006 advisory against smoked medical cannabis stating: "marijuana has a high potential for abuse, has no currently accepted medical use in treatment in the United States, and has a lack of accepted safety for use under medical supervision."
There is insufficient data to draw strong conclusions about the safety of medical cannabis. Typically, adverse effects of medical cannabis use are not serious. These include: tiredness, dizziness, cardiovascular and psychoactive effects. Tolerance to these effects develops over a period of days or weeks. The amount of cannabis normally used for medicinal purposes is not believed to cause any permanent cognitive impairment in adults, though long-term treatment in adolescents should be weighed carefully as they are more susceptible to these impairments. Withdrawal symptoms are rarely a problem with controlled medical administration of cannabinoids. The ability to drive vehicle or operating machinery may be impaired until a tolerance is developed. Although supporters of medical cannabis say that it is safe, further research is required to assess the long-term safety of its use.
THC, the principal psychoactive constituent of the cannabis plant, has low toxicity, the LD50 (dose of THC needed to kill 50% of tested rodents) is extremely high. Acute effects may include anxiety and panic, impaired attention, and memory (while intoxicated), an increased risk of psychotic symptoms, and possibly and increased risk of accidents if a person drives a motor vehicle while intoxicated. Psychotic episodes are well-documented and typically resolve within minutes or hours. There have been few reports of symptoms lasting longer.
According to the United States Department of Health and Human Services, there were 455,000 emergency room visits associated with cannabis use in 2011. These statistics include visits in which the patient was treated for a condition induced by or related to recent cannabis use. The drug use must be "implicated" in the emergency department visit, but does not need to be the direct cause of the visit. Most of the illicit drug emergency room visits involved multiple drugs. In 129,000 cases, cannabis was the only implicated drug.
Effects of chronic use may include bronchitis, a cannabis dependence syndrome, and subtle impairments of attention and memory. These deficits persist while chronically intoxicated. There is little evidence that cognitive impairments persist in adult abstinent cannabis users. Compared to non-smokers, people who smoked cannabis regularly in adolescence exhibit reduced connectivity in specific brain regions associated with memory, learning, alertness, and executive function. A study has suggested that sustained heavy, daily, adolescent onset cannabis use over decades is associated with a decline in IQ by age 38. No effects were found in those who initiated cannabis use later, or in those who ceased use earlier in adulthood.
There has been a limited amount of studies that have looked at the effects of smoking cannabis on the respiratory system. Chronic heavy marijuana smoking is associated with coughing, production of sputum, wheezing, coughing, and other symptoms of chronic bronchitis. Regular cannabis use has not been shown to cause significant abnormalities in lung function.
Cannabis smoke contains thousands of organic and inorganic chemical compounds. This tar is chemically similar to that found in tobacco smoke, and over fifty known carcinogens have been identified in cannabis smoke, including; nitrosamines, reactive aldehydes, and polycylic hydrocarbons, including benz[a]pyrene. Light and moderate use of cannabis is not believed to increase risk of lung or upper airway cancer. Evidence for causing these cancers is mixed concerning heavy, long-term use. In general there are far lower risks of pulmonary complications for regular cannabis smokers when compared with those of tobacco. Combustion products are not present when using a vaporizer, consuming THC in pill form, or consuming cannabis foods.
There is serious suspicion among cardiologists, spurring research but falling short of definitive proof, that cannabis use has the potential to contribute to cardiovascular disease. Cannabis is believed to be an aggravating factor in rare cases of arteritis, a serious condition that in some cases leads to amputation. Because 97% of case-reports also smoked tobacco, a formal association with cannabis could not be made. If cannabis arteritis turns out to be a distinct clinical entity, it might be the consequence of vasoconstrictor activity observed from delta-8-THC and delta-9-THC. Other serious cardiovascular events including myocardial infarction, stroke, sudden cardiac death, and cardiomyopathy have been reported to be temporally associated with cannabis use. Research in these events is complicated because cannabis is often used in conjunction with tobacco, and drugs such as alcohol and cocaine. These putative effects can be taken in context of a wide range of cardiovascular phenomena regulated by the endocannabinoid system and an overall role of cannabis in causing decreased peripheral resistance and increased cardiac output, which potentially could pose a threat to those with cardiovascular disease.
Cannabis usually causes no tolerance or withdrawal symptoms except in heavy users. In a survey of heavy users 42.4% experienced withdrawal symptoms when they tried to quit marijuana such as craving, irritability, boredom, anxiety and sleep disturbances. About 9% of those who experiment with marijuana eventually become dependent. The rate goes up to 1 in 6 among those who begin use as adolescents, and one quarter to one-half of those who use it daily according to a NIDA review. A 2013 review estimates daily use is associated with a 10-20% rate of dependence. The highest risk of cannabis dependence is found in those with a history of poor academic achievement, deviant behavior in childhood and adolescence, rebelliousness, poor parental relationships, or a parental history of drug and alcohol problems.
A 2013 literature review found that exposure to marijuana had biologically-based physical, mental, behavioral and social health consequences and was "associated with diseases of the liver (particularly with co-existing hepatitis C), lungs, heart, and vasculature".
The genus Cannabis contains two species which produce useful amounts of psychoactive cannabinoids: Cannabis indica and Cannabis sativa, which are listed as Schedule I medicinal plants in the US; a third species, Cannabis ruderalis, has few psychogenic properties. Cannabis contains more than 460 compounds; at least 80 of these are cannabinoids – chemical compounds that interact with cannabinoid receptors in the brain. As of 2012, more than 20 cannabinoids were being studied by the U.S. FDA.
The most psychoactive cannabinoid found in the cannabis plant is tetrahydrocannabinol (or delta-9-tetrahydrocannabinol, commonly known as THC). Other cannabinoids include delta-8-tetrahydrocannabinol, cannabidiol (CBD), cannabinol (CBN), cannabicyclol (CBL), cannabichromene (CBC) and cannabigerol (CBG); they have less psychotropic effects than THC, but may play a role in the overall effect of cannabis. The most studied are THC, CBD and CBN.
Cannabis, called má 麻 (meaning "hemp; cannabis; numbness") or dàmá 大麻 (with "big; great") in Chinese, was used in Taiwan for fiber starting about 10,000 years ago. The botanist Li Hui-Lin wrote that in China, "The use of Cannabis in medicine was probably a very early development. Since ancient humans used hemp seed as food, it was quite natural for them to also discover the medicinal properties of the plant." Emperor Shen-Nung, who was also a pharmacologist, wrote a book on treatment methods in 2737 BCE that included the medical benefits of cannabis. He recommended the substance for many ailments, including constipation, gout, rheumatism, and absent-mindedness. Cannabis is one of the 50 "fundamental" herbs in traditional Chinese medicine.
Surviving texts from ancient India confirm that cannabis' psychoactive properties were recognized, and doctors used it for treating a variety of illnesses and ailments, including insomnia, headaches, gastrointestinal disorders, and pain, including during childbirth.
The Ancient Greeks used cannabis to dress wounds and sores on their horses, and in humans, dried leaves of cannabis were used to treat nose bleeds, and cannabis seeds were used to expel tapeworms.
In the medieval Islamic world, Arabic physicians made use of the diuretic, antiemetic, antiepileptic, anti-inflammatory, analgesic and antipyretic properties of Cannabis sativa, and used it extensively as medication from the 8th to 18th centuries.
Albert Lockhart and Manley West began studying in 1964 the health effects of traditional cannabis use in Jamaican communities. They developed, and in 1987 gained permission to market, the pharmaceutical "Canasol", one of the first cannabis extracts.
Voters in eight US states showed their support for cannabis prescriptions or recommendations given by physicians between 1996 and 1999, going against policies of the federal government. As of mid-2014, 23 states plus the District of Columbia have passed medical marijuana laws, and in the November elections three more states (total 26) joined the burgeoning group, many of which are as yet in conflict with conditions set forth by the federal government.
On June 15, 2015, the Colorado Supreme Court ruled that even though medical marijuana is legal in Colorado, employers can fire workers who use marijuana for medical reasons because it violates federal law. The case involved a quadriplegic who had a doctor’s authorization to smoke medical marijuana, but who was fired by Dish Network in 2010 after failing a company drug test.
The Ebers Papyrus (ca. 1550 BCE) from Ancient Egypt has a prescription for medical marijuana applied directly for inflammation.
Society and culture
Medical use of cannabis or preparation containing THC as the active substance is legalized in Austria, Belgium, Canada, Czech Republic, Finland, Israel, Netherlands, Spain, the UK and some states in the US, although it is illegal under US federal law.
Cannabis is in Schedule IV of the United Nations' Single Convention on Narcotic Drugs, making it subject to special restrictions. Article 2 provides for the following, in reference to Schedule IV drugs:
A Party shall, if in its opinion the prevailing conditions in its country render it the most appropriate means of protecting the public health and welfare, prohibit the production, manufacture, export and import of, trade in, possession or use of any such drug except for amounts which may be necessary for medical and scientific research only, including clinical trials therewith to be conducted under or subject to the direct supervision and control of the Party.
The convention thus allows countries to outlaw cannabis for all non-research purposes but lets nations choose to allow medical and scientific purposes if they believe total prohibition is not the most appropriate means of protecting health and welfare. The convention requires that states that permit the production or use of medical cannabis must operate a licensing system for all cultivators, manufacturers and distributors and ensure that the total cannabis market of the state shall not exceed that required "for medical and scientific purposes."
As of 2014, 23 states plus the District of Columbia have passed medical cannabis laws, but its use remains illegal by federal law. In 1978 the US government created a program called the Compassionate Investigational New Drug program which dispenses cannabis cigarettes to 20 people with debilitating conditions including glaucoma and a rare bone disease. The program was "closed to new candidates in 1991", but as of 2013, allowed four people previously in the program to continue receiving medical cannabis.
Opinions of medical organizations
A number of medical organizations have endorsed reclassification of marijuana to allow for further study. These include, but are not limited to:
- The American Medical Association
- The American College of Physicians – America's second largest physicians group
- Leukemia & Lymphoma Society – America's second largest cancer charity
- American Academy of Family Physicians opposes the use of marijuana except under medical supervision
Other medical organizations recommend a halt to using marijuana as a medicine in U.S.
The method of obtaining medical cannabis varies by region and by legislation. In the US, most consumers grow their own or buy it from dispensaries in the 23 states and the District of Columbia that permit the use of medical cannabis. Marijuana vending machines for selling or dispensing cannabis are in use in the United States and are planned to be used in Canada. In 2014, the startup Meadow began offering on-demand delivery of medical marijuana in the San Francisco Bay Area, through their mobile app.
In the United States, health insurance companies may not pay for a medical marijuana prescription as the Food and Drug Administration must approve any substance for medicinal purposes. Before this can happen, the FDA must first permit the study of the medical benefits and drawbacks of the substance, which it has not done since it was placed on Schedule I of the Controlled Substances Act in 1970. Therefore all expenses incurred fulfilling a medical marijuana prescription will possibly be incurred as out-of-pocket. However, the New Mexico Court of Appeals has ruled that workers' compensation insurance must pay for marijuana prescribed as part of the state's Medical Cannabis Program.
The authors of a report on a 2011 survey of medical cannabis users say that critics have suggested that some users "game the system" to obtain medical cannabis ostensibly for treatment of a condition, but then use it for nonmedical purposes – though the truth of this claim is hard to measure. The report authors suggested rather that medical cannabis users occupied a "continuum" between medical and nonmedical use.
In the U.S., the FDA has approved two oral cannabinoids for use as medicine: dronabinol and nabilone. Dronabinol, synthetic THC, is listed as Schedule III, meaning it has some potential for dependence, and nabilone, a synthetic cannabinoid, is Schedule II, indicating high potential for side effects and addiction. Nabiximols, an oromucosal spray derived from two strains of Cannabis sativa and containing THC and CBD, is not approved in the U.S., but is approved in several European countries, Canada, and New Zealand as of 2013.
|Nabilone||Cesamet||U.S., Canada||Antiemetic (treatment of nausea or vomiting) associated with chemotherapy that has failed to respond adequately to conventional therapy|
|Dronabinol||Marinol||U.S., Canada||Antiemetic (treatment of nausea or vomiting) associated with chemotherapy that has failed to respond adequately to conventional therapy|
|U.S.||Anorexia associated with AIDS–related weight loss|
|Nabiximols||Sativex||Canada, New Zealand,
eight European countries
as of 2013
|Limited treatment for spasticity and neuropathic pain associated with multiple sclerosis and intractable cancer pain.|
Nabiximols is used for treatment of spasticity associated with MS when other therapies have not worked, and when an initial trial demonstrates "meaningful improvement". Trials for FDA approval in the U.S. are underway. It is also approved in several European countries for overactive bladder and vomiting. When sold under the trade name Sativex as a mouth spray, the prescribed daily dose in Sweden delivers a maximum of 32.4 mg of THC and 30 mg of CBD; mild to moderate dizziness is common during the first few weeks.
Relative to inhaled consumption, peak concentration of oral THC is delayed, and it may be difficult to determine optimal dosage because of variability in patient aborption.
The Schedule I classification of cannabis in the US makes the study of medical cannabis difficult.
Anecdotal evidence and pre-clinical research has suggested that cannabis or cannabinoids may be beneficial for treating Huntington's disease or Parkinson's disease, but follow-up studies of people with these conditions have not produced good evidence of therapeutic potential. A 2001 paper argued that cannabis had properties that made it potentially applicable to the treatment of amyotrophic lateral sclerosis, and on that basis research on this topic should be permitted, despite the legal difficulties of the time.
A 2005 review and meta-analysis said that bipolar disorder was not well-controlled by existing medications and that there were "good pharmacological reasons" for thinking cannabis had therapeutic potential, making it a good candidate for further study.
Cannabinoids have been proposed for the treatment of primary anorexia nervosa, but have no measurable beneficial effect. The authors of a 2003 paper argued that cannabinoids might have useful future clinical applications in treating digestive diseases. Laboratory experiments have shown that cannabinoids found in marijuana may have analgesic and anti-inflammatory effects.
In 2014, the American Academy of Neurology reviewed all available findings levering the use of marijuana to treat brain diseases. The result was that the scientific evidence is weak that cannabis in any form serves as medicinal for curing or alleviating neurological disorders. To ease multiple sclerosis patients' stiffness, which may be accomplished by their taking cannabis extract by mouth or as a spray, there is support. The academy has published new guidelines on the use of marijuana pills and sprays in the treatment of MS.
A 2007 review said cannabidiol had shown potential to relieve convulsion, inflammation, cough, congestion and nausea, and to inhibit cancer cell growth. Preliminary studies have also shown potential over psychiatric conditions such as anxiety, depression, and psychosis. Because cannabidiol relieves the aforementioned symptoms, cannabis strains with a high amount of CBD may benefit people with multiple sclerosis or frequent anxiety attacks.
Cannabinoids have been shown to exhibit some anti-cancer effects in laboratory experiments, although there has been little research into their use as a cancer treatment in people. Laboratory experiments have suggested that cannabis and cannabinoids have anticarcinogenic and antitumor effects, including a potential effect on breast- and lung-cancer cells. The National Cancer Institute reports that as of November 2013[update] there have been no clinical trials on the use of cannabis to treat cancer in people, and only one small study using delta-9-THC that reported potential antitumoral activity. Although there is ongoing research, claims that cannabis has been proved to cure cancer are, according to Cancer Research UK, both prevalent on the internet and "highly misleading".
There is no firm evidence that cannabis helps reduce the risk of getting cancer; whether it increases the risk is difficult to establish, since most users combine its use with tobacco smoking, and this complicates research.
Cannabinoids have been proposed to have the potential for lessening the effects of Alzheimer's disease. A 2012 review of the effect of cannabinoids on brain ageing found that "clinical evidence regarding their efficacy as therapeutic tools is either inconclusive or still missing". A 2009 Cochrane review said that the "one small randomized controlled trial [that] assessed the efficacy of cannabinoids in the treatment of dementia ... [had] ... poorly presented results and did not provide sufficient data to draw any useful conclusions".
There is emerging evidence that cannabidiol may help slow cell damage in diabetes mellitus type 1. There is a lack of meaningful evidence of the effects of medical cannabis use on people with diabetes; a 2010 review concluded that "the potential risks and benefits for diabetic patients remain unquantified at the present time".
A 2012 Cochrane review said there is not enough evidence to draw conclusions about the safety or efficacy of cannabinoids in the treatment of epilepsy. As of 2012, there have been few studies of the anticonvulsive properties of CBD and epileptic disorders. The major reasons for the lack of clinical research have been the introduction of new synthetic and more stable pharmaceutical anticonvulsants, the recognition of important adverse effects and the legal restriction to the use of cannabis-derived medicines. Epidiolex, a cannabis-based product developed by GW Pharmaceuticals for experimental treatment of epilepsy, will undergo stage-two trials in the US in 2014.
In 2009, the American Glaucoma Society noted that while cannabis can help lower intraocular pressure, it recommended against its use because of "its side effects and short duration of action, coupled with a lack of evidence that its use alters the course of glaucoma". As of 2008 relatively little research had been done concerning therapeutic effects of cannabinoids on the eyes.
A 2007 review of the history of medical cannabis said cannabinoids showed potential therapeutic value in treating Tourette syndrome (TS). A 2005 review said that controlled research on treating TS with dronabinol showed the patients taking the pill had a beneficial response without serious adverse effects; a 2000 review said other studies had shown that cannabis "has no effects on tics and increases the individuals inner tension".
A 2009 Cochrane review examined the two controlled trials to date using cannabinoids of any preparation type for the treatment of tics or TS (Muller-Vahl 2002, and Muller-Vahl 2003). Both trials compared delta-9-THC; 28 patients were included in the two studies (8 individuals participated in both studies). Both studies reported a positive effect on tics, but "the improvements in tic frequency and severity were small and were only detected by some of the outcome measures". The sample size was small and a high number of individuals either dropped out of the study or were excluded. The original Muller-Vahl studies reported individuals who remained in the study; patients may drop out when adverse effects are too high or efficacy is not evident. The authors of the original studies acknowledged few significant results after Bonferroni correction.
Cannabinoid medication might be useful in the treatment of the symptoms in patients with TS, but the 2009 review found that the two relevant studies of cannibinoids in treating tics had attrition bias, and that there was "not enough evidence to support the use of cannabinoids in treating tics and obsessive compulsive behaviour in people with Tourette's syndrome".
- Charlotte's Web cannabis strain
- Chinese herbology
- Medical cannabis in the United States
- Tilden's Extract
- Borgelt LM, Franson KL, Nussbaum AM, Wang GS (February 2013). "The pharmacologic and clinical effects of medical cannabis". Pharmacotherapy (Review) 33 (2): 195–209. doi:10.1002/phar.1187. PMID 23386598.
- Whiting, PF; Wolff, RF; Deshpande, S; Di Nisio, M; Duffy, S; Hernandez, AV; Keurentjes, JC; Lang, S; Misso, K; Ryder, S; Schmidlkofer, S; Westwood, M; Kleijnen, J (23 June 2015). "Cannabinoids for Medical Use: A Systematic Review and Meta-analysis.". JAMA 313 (24): 2456–2473. doi:10.1001/jama.2015.6358. PMID 26103030.
- Wang T, Collet JP, Shapiro S, Ware MA (June 2008). "Adverse effects of medical cannabinoids: a systematic review". CMAJ (Review) 178 (13): 1669–78. doi:10.1503/cmaj.071178. PMC 2413308. PMID 18559804.
- Ben Amar M (2006). "Cannabinoids in medicine: a review of their therapeutic potential" (PDF). Journal of Ethnopharmacology (Review) 105 (1–2): 1–25. doi:10.1016/j.jep.2006.02.001. PMID 16540272.
- "AMA Reaffirms Opposition to Marijuana Legalization". Retrieved 25 April 2014.
- "American Society of Addiction Medicine Rejects Use of 'Medical Marijuana'". Retrieved 25 April 2014.
- "Minnesota doctors oppose medical marijuana bill". Retrieved 25 April 2014.
- "American Academy of Pediatrics Reaffirms Opposition to Legalizing Marijuana for Recreational or Medical Use". American Academy of Pediatrics. 26 January 2015. Retrieved 28 January 2015.
- "H-95.952 Cannabis for Medicinal Use". American Medical Association. Retrieved 24 June 2015.
- Bob Egelko (15 January 2014). "Court upholds crackdown on pot dispensaries". SFGate. Hearst Communications, Inc. Retrieved 3 March 2014.
- "Nida: Marijuana, An update from the National Institute on Drug Abuse". Nida.nih.gov. February 2011. Retrieved 2011-08-23.
- "Medical Marijuana, American Society of Addiction Medicine, 2010". Asam.org. 1 April 2010. Retrieved 2011-04-20.[dead link]
- Committee on Obstetric Practice (July 2015). "Committee Opinion No. 637: Marijuana Use During Pregnancy and Lactation". Obstetrics & Gynecology: 126 (1): 234–238. doi:10.1097/01.AOG.0000467192.89321.a6.
- Grotenhermen, F; Müller-Vahl, K (July 2012). "The therapeutic potential of cannabis and cannabinoids.". Deutsches Arzteblatt international 109 (29-30): 495–501. PMID 23008748.
- Bowles DW, O'Bryant CL, Camidge DR, Jimeno A (July 2012). "The intersection between cannabis and cancer in the United States". Crit. Rev. Oncol. Hematol. (Review) 83 (1): 1–10. doi:10.1016/j.critrevonc.2011.09.008. PMID 22019199.
- Jordan K, Sippel C, Schmoll HJ (September 2007). "Guidelines for antiemetic treatment of chemotherapy-induced nausea and vomiting: past, present, and future recommendations". Oncologist (Review) 12 (9): 1143–50. doi:10.1634/theoncologist.12-9-1143. PMID 17914084.
- Nicolson SE, Denysenko L, Mulcare JL et al. (May–Jun 2012). "Cannabinoid hyperemesis syndrome: a case series and review of previous reports". Psychosomatics (Review, case series) 53 (3): 212–9. doi:10.1016/j.psym.2012.01.003. PMID 22480624.
- Phillips RS, Gopaul S, Gibson F et al. (2010). "Antiemetic medication for prevention and treatment of chemotherapy induced nausea and vomiting in childhood". Cochrane Database Syst Rev (Review) (9): CD007786. doi:10.1002/14651858.CD007786.pub2. PMID 20824866. (subscription required (. ))
- Lutge EE, Gray A, Siegfried N (2013). "The medical use of cannabis for reducing morbidity and mortality in patients with HIV/AIDS". Cochrane Database Syst Rev (Review) 4: CD005175. doi:10.1002/14651858.CD005175.pub3. PMID 23633327.
- Martín-Sánchez E, Furukawa TA, Taylor J, Martin JL (November 2009). "Systematic review and meta-analysis of cannabis treatment for chronic pain". Pain medicine (Malden, Mass.) (Review, meta-analysis) 10 (8): 1353–68. doi:10.1111/j.1526-4637.2009.00703.x. PMID 19732371.
- Lynch ME, Campbell F (November 2011). "Cannabinoids for treatment of chronic non-cancer pain; a systematic review of randomized trials". British Journal of Clinical Pharmacology (Review) 72 (5): 735–44. doi:10.1111/j.1365-2125.2011.03970.x. PMC 3243008. PMID 21426373.
- Carter GT, Flanagan AM, Earleywine M et al. (August 2011). "Cannabis in palliative medicine: improving care and reducing opioid-related morbidity". The American journal of hospice & palliative care (Review) 28 (5): 297–303. doi:10.1177/1049909111402318. PMID 21444324.
- Kahan, M; Srivastava, A; Spithoff, S; Bromley, L (December 2014). "Prescribing smoked cannabis for chronic noncancer pain: preliminary recommendations.". Canadian family physician Medecin de famille canadien 60 (12): 1083–90. PMID 25500598.
- Koppel, BS; Brust, JC; Fife, T; Bronstein, J; Youssof, S; Gronseth, G; Gloss, D (Apr 29, 2014). "Systematic review: efficacy and safety of medical marijuana in selected neurologic disorders: report of the Guideline Development Subcommittee of the American Academy of Neurology.". Neurology 82 (17): 1556–63. doi:10.1212/WNL.0000000000000363. PMID 24778283.
- Lakhan SE, Rowland M (2009). "Whole plant cannabis extracts in the treatment of spasticity in multiple sclerosis: a systematic review". BMC Neurology (Review) 9: 59. doi:10.1186/1471-2377-9-59. PMC 2793241. PMID 19961570.
- Koppel, BS; Brust, JC; Fife, T; Bronstein, J; Youssof, S; Gronseth, G; Gloss, D (29 April 2014). "Systematic review: efficacy and safety of medical marijuana in selected neurologic disorders: report of the Guideline Development Subcommittee of the American Academy of Neurology.". Neurology 82 (17): 1556–63. doi:10.1212/WNL.0000000000000363. PMID 24778283.
- [conflicted source?] Clark PA, Capuzzi K, Fick C (2011). "Medical marijuana: Medical necessity versus political agenda". Medical Science Monitor (Review) 17 (12): RA249–61. doi:10.12659/MSM.882116. PMC 3628147. PMID 22129912.
- Oreja-Guevara, C (2012). "Treatment of spasticity in multiple sclerosis: New perspectives regarding the use of cannabinoids". Revista de neurologia (Review) (in Spanish) 55 (7): 421–30. PMID 23011861.
- Curtis A, Clarke CE, Rickards HE (2009). "Cannabinoids for Tourette's Syndrome". Cochrane Database Syst Rev (Review) (4): CD006565. doi:10.1002/14651858.CD006565.pub2. PMID 19821373. (subscription required (. ))
- "Inter-agency advisory regarding claims that smoked marijuana is a medicine" (Press release). fda.gov. 2006-04-20. Retrieved 24 December 2012.
- Washington, Tabitha A.; Brown, Khalilah M.; Fanciullo, Gilbert J. (2012). "Chapter 31: Medical Cannabis". Pain. Oxford University Press. p. 165. ISBN 978-0-19-994274-9.
Proponents of medical cannabis site its safety, but there studies in later years that support that smoking of marijuana is associated with risk for dependence and that THC alters the structures of cells in the brain
- Barceloux, Donald G (2012). "Chapter 60: Marijuana (Cannabis sativa L.) and synthetic cannabinoids". Medical Toxicology of Drug Abuse: Synthesized Chemicals and Psychoactive Plants. pp. 886–931. ISBN 978-0-471-72760-6.
- W. Hall, N. Solowij (1998-11-14). "Adverse effects of cannabis". Lancet 352 (9140): 1611–16. doi:10.1016/S0140-6736(98)05021-1. PMID 9843121.
- "Sativex Oral Mucosal Spray Public Assessment Report. Decentralized Procedure." (PDF). United Kingdom Medicines and Healthcare Products Regulatory Agency. p. 93. Retrieved 2015-05-07.
There is clear evidence that recreational cannabis can produce a transient toxic psychosis in larger doses or in susceptible individuals, which is said to characteristically resolve within a week or so of absence (Johns 2001). Transient psychotic episodes as a component of acute intoxication are well-documented (Hall et al 1994)
- D'Souza, DC; Sewell, RA; Ranganathan, M (October 2009). "Cannabis and psychosis/schizophrenia: human studies.". European archives of psychiatry and clinical neuroscience 259 (7): 413–31. PMID 19609589.
- "Drug Abuse Warning Network, 2011. National Estimates of Drug-Related Emergency Department Visits" (PDF). U.S. Department of Health and Human Services. 2011. Retrieved 2015-05-08.
- Volkow ND, Baler RD, Compton WM, Weiss SR (2014). "Adverse health effects of marijuana use". N. Engl. J. Med. 370 (23): 2219–27. doi:10.1056/NEJMra1402309. PMID 24897085.
- van Holst, RJ; Schilt, T (March 2011). "Drug-related decrease in neuropsychological functions of abstinent drug users.". Current drug abuse reviews 4 (1): 42–56. PMID 21466500.
- Hall, W (January 2015). "What has research over the past two decades revealed about the adverse health effects of recreational cannabis use?". Addiction (Abingdon, England) 110 (1): 19–35. PMID 25287883.
- Stephen Maisto; Mark Galizio; Gerard Connors (2014). Drug Use and Abuse. Cengage Learning. p. 278. ISBN 978-1-305-17759-8.
- Tashkin, DP (June 2013). "Effects of marijuana smoking on the lung.". Annals of the American Thoracic Society 10 (3): 239–47. PMID 23802821.
- Gumbiner, Jann (2011-02-17). "Does Marijuana Cause Cancer?". Psychology Today. Retrieved 2013-01-09.
- "Does smoking cannabis cause cancer?". Cancer Research UK. 2010-09-20. Retrieved 2013-01-09.
- Tashkin, Donald (March 1997). "Effects of marijuana on the lung and its immune defenses". UCLA School of Medicine. Retrieved 2012-06-23.
- A. Riecher-Rössler (2014). Comorbidity of Mental and Physical Disorders. Karger Medical and Scientific Publishers. p. 88. ISBN 978-3-318-02604-7.
- Cottencin O. (Dec 2010). "Cannabis arteritis: review of the literature". J Addict Med (Review) 4 (4): 191–6. doi:10.1097/ADM.0b013e3181beb022. PMID 21769037.
- Thomas G (2014-01-01). "Adverse cardiovascular, cerebrovascular, and peripheral vascular effects of marijuana inhalation: what cardiologists need to know". Am J Cardiol 113 (1): 187–90. doi:10.1016/j.amjcard.2013.09.042. PMID 24176069.
- RT Jones (2002). "Cardiovascular system effects of marijuana". J Clin Pharmacol (Review) 42 (11 Suppl): 58S–63S. doi:10.1002/j.1552-4604.2002.tb06004.x. PMID 12412837.
- "Withdrawal Symptoms From Smoking Pot?". WebMD.
- Hall, W; Degenhardt, L (17 October 2009). "Adverse health effects of non-medical cannabis use.". Lancet 374 (9698): 1383–91. PMID 19837255.
- Gordon AJ, Conley JW, Gordon JM (December 2013). "Medical consequences of marijuana use: a review of current literature". Curr Psychiatry Rep (Review) 15 (12): 419. doi:10.1007/s11920-013-0419-7. PMID 24234874.
- Downer EJ, Campbell VA (January 2010). "Phytocannabinoids, CNS cells and development: a dead issue?". Drug Alcohol Rev (Review) 29 (1): 91–8. doi:10.1111/j.1465-3362.2009.00102.x. PMID 20078688.
- Burns TL, Ineck JR (2006). "Cannabinoid analgesia as a potential new therapeutic option in the treatment of chronic pain". The Annals of Pharmacotherapy (Review) 40 (2): 251–260. doi:10.1345/aph.1G217. PMID 16449552.
- Svrakic DM, Lustman PJ, Mallya A, Lynn TA, Finney R, Svrakic NM (2012). "Legalization, decriminalization & medicinal use of cannabis: a scientific and public health perspective". Mo Med (Review) 109 (2): 90–8. PMID 22675784.
- Abel, Ernest L. (1980). "Cannabis in the Ancient World". Marihuana: the first twelve thousand years. New York City: Plenum Publishers. ISBN 978-0-306-40496-2. Retrieved 2013-12-18.[page needed]
- Li, Hui-Lin (1974). "An Archaeological and Historical Account of Cannabis in China", Economic Botany 28.4:437–448, p. 444.
- Bloomquist, Edward (1971). Marijuana: The Second Trip. California: Glencoe Press.
- Wong, Ming (1976). La Médecine chinoise par les plantes. Paris: Tchou. OCLC 2646789.[page needed]
- [unreliable source?] "The Ebers Papyrus The Oldest (confirmed) Written Prescriptions For Medical Marihuana era 1,550 BC". onlinepot.org. Retrieved 2008-06-10.
- Pain, Stephanie (15 December 2007). "The Pharaoh's pharmacists". New Scientist (Reed Business Information Ltd.).
- Touw, Mia (1981). "The Religious and Medicinal Uses ofCannabisin China, India and Tibet". Journal of Psychoactive Drugs 13 (1): 23–34. doi:10.1080/02791072.1981.10471447. PMID 7024492.
- Butrica, James L. (2002). "The Medical Use of Cannabis Among the Greeks and Romans" (PDF). Journal of Cannabis Therapeutics 2 (2): 51. doi:10.1300/J175v02n02_04. Retrieved 8 November 2014.
- Lozano, Indalecio (2001). "The Therapeutic Use of Cannabis sativa (L.) in Arabic Medicine". Journal of Cannabis Therapeutics 1: 63. doi:10.1300/J175v01n01_05.
- Alison Mack; Janet Joy (7 December 2000). Marijuana As Medicine?: The Science Beyond the Controversy. National Academies Press. pp. 15–. ISBN 978-0-309-06531-3.
- Dr Farid F. Youssef. "Cannibis Unmasked: What it is and why it does what it does". UWIToday: June 2010. http://sta.uwi.edu/uwitoday/archive/june_2010/article9.asp
- [dated info] Baker D, Pryce G, Giovannoni G, Thompson AJ (May 2003). "The therapeutic potential of cannabis". Lancet Neurol 2 (5): 291–8. doi:10.1016/S1474-4422(03)00381-8. PMID 12849183.
- Mack,Alison ; Joy, Janet (2001). Marijuana As Medicine. National Academy Press. ISBN 0-309-06531-3.[page needed]
- "23 Legal Medical Marijuana States and DC - Medical Marijuana - ProCon.org". procon.org.
- Isidore, Chris. "Colorado Top Court Says Dish Worker Can be Fired for Medical Marijuana". CNN Money. CNN. Retrieved 16 June 2015.
- "Single Convention on Narcotic Drugs, 1961 As amended by the 1972 Protocol" (PDF). International Narcotics Control Board. United Nations. 13 March 1961. pp. 2–3. Retrieved 17 August 2009.
- AMA meeting: Delegates support review of cannabis's schedule I status; A change could make it easier for researchers to test potential medical uses and develop a drug delivery form safer than smoking. By Kevin B. O'Reilly, American Medical News. 30 November 2009
- "AMA Urges Reclassifying Marijuana". Americans for Safe Access. Archived from the original on 2013-05-27. Retrieved 10 January 2010.
- "Use of Cannabis for Medicinal Purposes" (PDF). Report 3 of the Council on Science and Public Health (I-09). American Medical Assn. Retrieved 10 January 2010.
- "Supporting Research into the Therapeutic Role of Marijuana" (PDF). The American College of Physicians. 2008. Retrieved 15 August 2009.
- "Medical Marijuana Endorsements and Statements of Support". Marijuana Policy Project. 2007. Archived from the original on 14 March 2008. Retrieved 29 January 2008.
- "Marijuana: Policy & Advocacy". American Academy of Family Physicians. 2009. Archived from the original on 2008-05-16. Retrieved 6 October 2009.
- "American Society of Addiction Medicine Rejects Use of 'Medical Marijuana,' Citing Dangers and Failure To Meet Standards of Patient Care, March 23, 2011" (Press release). Maryland. PR Newswire. Retrieved 2011-04-20.
- Timothy B. Wheeler (2014-10-11). "Medical marijuana fees stir debate in Maryland". The Baltimore Sun. Retrieved 2014-10-12.
- Blackwell, Tom (2013-10-16). "The pot vending machine’s first foreign market? Canada, of course, ‘a seed for the rest of the world’". National Post. Retrieved 2013-12-04.
- Clark, Tonya Body (February 10, 2015). "The Medical Marijuana Debate". Compliance Corner. Wolters Kluwer Financial Services. Retrieved February 26, 2015.
- Peters, Joey (June 29, 2015). "Court: Employer can’t block workers’ comp for medical marijuana". NM Political Report. Retrieved June 30, 2015.
- Reinarman C, Nunberg H, Lanthier F, Heddleston T (2011). "Who are medical marijuana patients? Population characteristics from nine California assessment clinics". J Psychoactive Drugs (Review) 43 (2): 128–35. doi:10.1080/02791072.2011.587700. PMID 21858958.
- "Produkt - FASS Allmänhet". fass.se.
- Iuvone T, Esposito G, De Filippis D et al. (2009). "Cannabidiol: A promising drug for neurodegenerative disorders?". CNS neuroscience & therapeutics (Review) 15 (1): 65–75. doi:10.1111/j.1755-5949.2008.00065.x. PMID 19228180.
- [dated info] Carter GT, Rosen BS (2001). "Marijuana in the management of amyotrophic lateral sclerosis". The American journal of hospice & palliative care (Review) 18 (4): 264–70. doi:10.1177/104990910101800411. PMID 11467101.
- [dated info] Ashton CH, Moore PB, Gallagher P, Young AH, (2005). "Cannabinoids in bipolar affective disorder: A review and discussion of their therapeutic potential". Journal of psychopharmacology (Review, meta-analysis) 19 (3): 293–300. doi:10.1177/0269881105051541. PMID 15888515.
- Ethan B Russo (5 September 2013). Cannabis and Cannabinoids: Pharmacology, Toxicology, and Therapeutic Potential. Routledge. p. 191. ISBN 978-1-136-61493-4.
- [dated info] Di Carlo G, Izzo AA (2003). "Cannabinoids for gastrointestinal diseases: potential therapeutic applications". Expert Opinion on Investigational Drugs (Review) 12 (1): 39–49. doi:10.1517/13543722.214.171.124. PMID 12517253.
- "Cannabis and Cannabinoids (PDQ®)". National Cancer Institute at the National Institutes of Health. National Cancer Institute. 2 August 2013. Retrieved 24 August 2013.
- Koppel, Barbara S., MD et al. (29 April 2014). "Systematic review: Efficacy and safety of medical marijuana in selected neurologic disorders". Neurology 82 (17): 1556–1563. doi:10.1212/wnl.0000000000000363.
- Naftali T, Mechulam R, Lev LB, Konikoff FM (2014). "Cannabis for inflammatory bowel disease". Dig Dis (Review) 32 (4): 468–74. doi:10.1159/000358155. PMID 24969296.
- Mechoulam R, Peters M, Murillo-Rodriguez E, Hanus LO (August 2007). "Cannabidiol--recent advances". Chem. Biodivers. (Review) 4 (8): 1678–92. doi:10.1002/cbdv.200790147. PMID 17712814.
- Campos AC, Moreira FA, Gomes FV, Del Bel EA, Guimarães FS (December 2012). "Multiple mechanisms involved in the large-spectrum therapeutic potential of cannabidiol in psychiatric disorders". Philos. Trans. R. Soc. Lond., B, Biol. Sci. (Review) 367 (1607): 3364–78. doi:10.1098/rstb.2011.0389. PMC 3481531. PMID 23108553.
- Bowles, DW; O'Bryant, CL; Camidge, DR; Jimeno, A (July 2012). "The intersection between cannabis and cancer in the United States". Critical reviews in oncology/hematology (Review) 83 (1): 1–10. doi:10.1016/j.critrevonc.2011.09.008. PMID 22019199.
- "Cannabis (marihuana, marijuana) and the cannabinoids". Health Canada. February 2013. Retrieved December 2, 2013.
- "Cannabis and Cannabinoids: Human/Clinical Studies". National Cancer Institute. November 21, 2013. Retrieved December 2, 2013.
- Arney, Kat (2012-07-25). "Cannabis, cannabinoids and cancer – the evidence so far". Cancer Research UK. Retrieved 2013-12-08.
- Campbell VA, Gowran A (2007). "Alzheimer's disease; taking the edge off with cannabinoids?". British Journal of Pharmacology (Review) 152 (5): 655–62. doi:10.1038/sj.bjp.0707446. PMC 2190031. PMID 17828287.
- Bilkei-Gorzo A (2012). "The endocannabinoid system in normal and pathological brain ageing". Philosophical transactions of the Royal Society of London. Series B, Biological sciences (Review) 367 (1607): 3326–41. doi:10.1098/rstb.2011.0388. PMC 3481530. PMID 23108550.
- Krishnan S, Cairns R, Howard R (2009). "Cannabinoids for the treatment of dementia". Cochrane Database Syst Rev (Review) (2): CD007204. doi:10.1002/14651858.CD007204.pub2. PMID 19370677. (subscription required (. ))
- Di Marzo V, Piscitelli F, Mechoulam R (2011). "Cannabinoids and endocannabinoids in metabolic disorders with focus on diabetes". Handb Exp Pharmacol. (Review). Handbook of Experimental Pharmacology 203 (75): 75–104. doi:10.1007/978-3-642-17214-4_4. ISBN 978-3-642-17213-7. PMID 21484568.
- Fisher M, White S, Varbiro G et al. (2010). "The role of cannabis and cannabinoids in diabetes". The British Journal of Diabetes & Vascular Disease 10 (6): 267. doi:10.1177/1474651410385860.
- Gloss D, Vickrey B (2012). "Cannabinoids for epilepsy". Cochrane Database Syst Rev (Review) 6: CD009270. doi:10.1002/14651858.CD009270.pub2. PMID 22696383.
- Pertwee RG (2012). "Targeting the endocannabinoid system with cannabinoid receptor agonists: pharmacological strategies and therapeutic possibilities". Philosophical Transactions of the Royal Society B-Biological Sciences (Review) 367 (1607): 3353–63. doi:10.1098/rstb.2011.0381. PMC 3481523. PMID 23108552.
- Ward, Andrew (9 January 2014). "GW raises nearly $90m to develop childhood epilepsy treatment". Financial Times. Retrieved 20 January 2014.
- Jampel, Henry (10 August 2009). "Position statement on marijuana and the treatment of glaucoma". American Glaucoma Society. Retrieved November 2013.
- Yazulla S (Sep 2008). "Endocannabinoids in the retina: from marijuana to neuroprotection". Progress in retinal and eye research (Review) 27 (5): 501–26. doi:10.1016/j.preteyeres.2008.07.002. PMC 2584875. PMID 18725316.
- [dated info] Kogan NM, Mechoulam R (2007). "Cannabinoids in health and disease". Dialogues Clin Neurosci 9 (4): 413–30. PMC 3202504. PMID 18286801.
- [dated info] Singer HS (2005). "Tourette's syndrome: from behaviour to biology". Lancet Neurol (Review) 4 (3): 149–59. doi:10.1016/S1474-4422(05)01012-4. PMID 15721825.
- [dated info] Robertson MM (2000). "Tourette syndrome, associated conditions and the complexities of treatment". Brain: a journal of neurology (Review) 123 (3): 425–62. doi:10.1093/brain/123.3.425. PMID 10686169.
- Iversen, Leslie L. (2000). The Science of Marijuana. Oxford University Press. ISBN 0-19-513123-1.
- 2009 Conference on Cannabinoids in Medicine, International Association for Cannabis as Medicine
- "References on Multiple Sclerosis and Marijuana". Schaffer Library of Drug Policy. Retrieved 2013-12-18.
- Wujastyk, Dominik (12 September 2001). "Cannabis in Traditional Indian Herbal Medicine" (PDF). Archived from the original (PDF) on 2005-11-10. Retrieved 23 September 2009.
|Wikimedia Commons has media related to Medical cannabis.|
- Medical cannabis at DMOZ, links to websites about medical cannabis
- Information on Cannabis and Cannabinoids from the U.S. National Cancer Institute
- Information on cannabis (marihuana, marijuana) and the cannabinoids from Health Canada
- The Center for Medicinal Cannabis Research of the University of California