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Cannabis Indica fluid extract, American Druggists Syndicate, pre-1937.
Medical cannabis (also referred to as medical marijuana) refers to the use of Cannabis (marijuana), including constituents of cannabis, THC and other cannabinoids, as a physician-recommended form of medicine or herbal therapy. Cannabis has a long history of medicinal use, with evidence dating back to 2,000 B.C.E.
Although the extent of the medicinal value of cannabis has been disputed, it does have several well-documented beneficial effects. Among these are: the amelioration of nausea and vomiting, stimulation of hunger in chemotherapy and AIDS patients, lowered intraocular eye pressure (shown to be effective for treating glaucoma), as well as general analgesic effects (pain reliever). Less confirmed individual studies also have been conducted indicating cannabis is beneficial in a variety of conditions including Multiple sclerosis and depression.
Synthetic cannabinoids are also available as prescription drugs in many countries. Examples include Marinol, available in Germany and the United States, and Cesamet, available in Canada, Mexico, the United Kingdom, and also in the United States.
There are several methods for administration of dosage, including vaporizing or smoking dried buds, drinking or eating extracts, and taking capsules. The comparable efficacy of these methods was the subject of an investigative study  conducted by the National Institutes of Health.
While cannabis for recreational use is illegal in most parts of the world, its use as a medicine is legal in a number of territories worldwide, including Canada, Austria, Germany, the Netherlands, Spain, Israel, Italy, Finland, and Portugal. In the United States, federal law outlaws all cannabis use, while permission for medical cannabis varies among states. Distribution is usually done within a framework defined by local laws. Medical cannabis remains a controversial issue worldwide.
Partial list of clinical applications
"Victoria", the United States' first legal medical marijuana plant grown by The Wo/Men's Alliance for Medical Marijuana.
In a 2002 review of medical literature, medical cannabis was shown to have established effects in the treatment of nausea, vomiting, premenstrual syndrome, unintentional weight loss, and lack of appetite. Other "relatively well-confirmed" effects were in the treatment of "spasticity, painful conditions, especially neurogenic pain, movement disorders, asthma, [and] glaucoma".
Preliminary findings indicate that cannabis-based drugs could prove useful in treating inflammatory bowel disease (consisting of Crohn's disease and ulcerative colitis), migraines, fibromyalgia, and related conditions.
Medical cannabis has also been found to relieve certain symptoms of multiple sclerosis and spinal cord injuries by exhibiting antispasmodic and muscle-relaxant properties as well as stimulating appetite. Clinical trials provide evidence that THC reduces motor and vocal tics of Tourette syndrome and related behavioral problems such as obsessive–compulsive disorders.
Other studies have shown cannabis or cannabinoids may be useful in treating alcohol abuse, attention-deficit hyperactivity disorder (ADHD or AD/HD) amyotrophic lateral sclerosis, collagen-induced arthritis, rheumatoid arthritis, asthma, atherosclerosis, autism, bipolar disorder, childhood mental disorders, colorectal cancer, depression, diabetic retinopathy, dystonia, epilepsy, digestive diseases, gliomas, hepatitis C, Huntington's disease, hypertension, urinary incontinence, leukemia, skin tumors, morning sickness, methicillin-resistant Staphylococcus aureus (MRSA), Parkinson's disease, pruritus, posttraumatic stress disorder (PTSD), sickle-cell disease,,sleep apnea,tourette syndrome, and anorexia nervosa.
Research done by the Scripps Research Institute in California shows that the active ingredient in marijuana, THC, prevents the formation of deposits in the brain associated with Alzheimer's disease. THC was found to prevent an enzyme called acetylcholinesterase from accelerating the formation of "Alzheimer plaques" in the brain more effectively than commercially marketed drugs. THC is also more effective at blocking clumps of protein that can inhibit memory and cognition in Alzheimer’s patients, as reported in Molecular Pharmaceutics.
Lung cancer and chronic obstructive pulmonary disease
THC has been found to reduce tumor growth in common lung cancer by 50 percent and to significantly reduce the ability of the cancer to spread, say researchers at Harvard University, who tested the chemical in both lab and mouse studies. The researchers suggest that THC might be used in a targeted fashion to treat lung cancer.
In 2006, Donald Tashkin, of the University of California in Los Angeles, presented the results of his study, Marijuana Use and Lung Cancer: Results of a Case-Control Study. Tashkin found that smoking marijuana does not appear to increase the risk of lung cancer or head-and-neck malignancies, even among heavy users. The more tobacco a person smoked, the greater their risk of developing lung cancer and other cancers of the head and neck. But people who smoked more marijuana were not at increased risk compared with people who smoked less and people who didn’t smoke at all. Marijuana use was associated with cancer risk ratios below 1.0, indicating that a history of marijuana smoking had no effect on the risk for respiratory cancers. In contrast, tobacco smoking had a 21-fold risk for cancer. Tashkin concluded, "It's possible that tetrahydrocannabinol (THC) in marijuana smoke may encourage apoptosis, or programmed cell death, causing cells to die off before they have a chance to undergo malignant transformation".
Wan Tan presented a study at the American Thoracic Society 2007 International Conference showing that smoking marijuana and tobacco together more than tripled the risk of developing Chronic obstructive pulmonary disease (COPD) over just smoking tobacco alone.
Similar findings were released in April 2009 by the Vancouver Burden of Obstructive Lung Disease Research Group. The study presents that smoking both tobacco and marijuana synergistically increased the risk of respiratory symptoms and COPD. Smoking only marijuana, however, was not associated with an increased risk of respiratory symptoms of COPD. In a related commentary, Tashkin writes, "…we can be close to concluding that marijuana smoking by itself does not lead to COPD".
According to a 2007 study at the California Pacific Medical Center Research Institute, cannabidiol (CBD) may stop breast cancer from spreading throughout the body. These researchers believe their discovery may provide a non-toxic alternative to chemotherapy while achieving the same results minus the painful and unpleasant side effects. The research team says that CBD works by blocking the activity of a gene called Id-1, which is believed to be responsible for a process called metastasis, which is the aggressive spread of cancer cells away from the original tumor site.
Investigators at Columbia University published clinical trial data in 2007 showing that HIV/AIDS patients who inhaled cannabis four times daily experienced substantial increases in food intake with little evidence of discomfort and no impairment of cognitive performance. They concluded that smoked marijuana has a clear medical benefit in HIV-positive patients. In another study in 2008, researchers at the University of California, San Diego School of Medicine found that marijuana significantly reduces HIV-related neuropathic pain when added to a patient's already-prescribed pain management regimen and may be an "effective option for pain relief" in those whose pain is not controlled with current medications. Mood disturbance, physical disability, and quality of life all improved significantly during study treatment. Despite management with opioids and other pain modifying therapies, neuropathic pain continues to reduce the quality of life and daily functioning in HIV-infected individuals. Cannabinoid receptors in the central and peripheral nervous systems have been shown to modulate pain perception. No serious adverse effects were reported, according to the study published by the American Academy of Neurology.
A study by Complutense University of Madrid found the chemicals in marijuana promotes the death of brain cancer cells by essentially helping them feed upon themselves in a process called autophagy. The research team discovered that cannabinoids such as THC had anticancer effects in mice with human brain cancer cells and in people with brain tumors. When mice with the human brain cancer cells received the THC, the tumor shrank. Using electron microscopes to analyze brain tissue taken both before and after a 26- to 30-day THC treatment regimen, the researchers found that THC eliminated cancer cells while leaving healthy cells intact. The patients did not have any toxic effects from the treatment; previous studies of THC for the treatment of cancer have also found the therapy to be well tolerated. However, the mechanisms which promote THC's tumor cell–killing action are unknown.
Injections of THC eliminate dependence on opiates in stressed rats, according to a research team at the Laboratory for Physiopathology of Diseases of the Central Nervous System (France) in the journal Neuropsychopharmacology. Deprived of their mothers at birth, rats become hypersensitive to the rewarding effect of morphine and heroin (substances belonging to the opiate family), and rapidly become dependent. When these rats were administered THC, they no longer developed typical morphine-dependent behavior. In the striatum, a region of the brain involved in drug dependence, the production of endogenous enkephalins was restored under THC, whereas it diminished in rats stressed from birth which had not received THC. Researchers believe the findings could lead to therapeutic alternatives to existing substitution treatments.
In humans, drug treatment subjects who use cannabis intermittently are found to be more likely to adhere to treatment for opioid dependence. Historically, similar findings were reported by Clendinning, who in 1843 utilized cannabis substitution for the treatment of alcoholism and opium addiction and Birch, in 1889, who reported success in treating opiate and chloral addiction with cannabis.
Spasticity in multiple sclerosis
A review of six randomized controlled trials of a combination of THC and CBD extracts for MS related spasticity noted a "trend of reduced spasticity in treated patients", however, quantitative analysis was not prudent. The authors postulate that "cannabinoids may provide neuroprotective and anti-inflammatory benefits in MS."
Cannabis contains over 300 compounds. 60 of these are cannabinoids, which are the basis for medical and scientific use of cannabis. This presents the research problem of isolating the effect of specific compounds and taking account of the interaction of these compounds. Cannabinoids can serve as appetite stimulants, antiemetics, antispasmodics, and have some analgesic effects. Three important cannabinoids found in the cannabis plant are cannabidiol, β-caryophyllene, and Cannabigerol.
β-Caryophyllene has important anti-inflammatory properties.
Main article: Cannabidiol
Cannabidiol (CBD), is a major constituent of medical cannabis. CBD represents up to 40% of extracts of the medical cannabis plant. Cannabidiol relieves convulsion, inflammation, anxiety, nausea, and inhibits cancer cell growth. Recent studies have shown cannabidiol to be as effective as atypical antipsychotics in treating schizophrenia. Because cannabidiol relieves the aforementioned symptoms, cannabis strains with a high amount of CBD would be ideal for people with multiple sclerosis, frequent anxiety attacks and Tourette syndrome.
Main article: Caryophyllene
Part of the mechanism by which medical cannabis has been shown to reduce tissue inflammation is via the compound β-caryophyllene. A cannabinoid receptor called CB2 plays a vital part in reducing inflammation in humans and other animals. β-Caryophyllene has been shown to be a selective activator of the CB2 receptor. β-Caryophyllene is especially concentrated in cannabis essential oil, which contains about 12–35% β-caryophyllene.
Main article: Cannabigerol
Like cannabidiol, cannabigerol is not psychoactive but has been shown to lower blood pressure in rates greater than cannabinol.
Pharmacologic THC and THC derivatives
In the USA, the FDA has approved two cannabinoids for use as medical therapies: dronabinol (Marinol) and nabilone. These medicines are taken orally.
These medications are usually used when first line treatments for nausea and vomiting associated with cancer chemotherapy fail to work. In extremely high doses and in rare cases "psychotomimetic" side effects are possible. The other commonly-used antiemetic drugs are not associated with these side effects.
The prescription drug Sativex, an extract of cannabis administered as a sublingual spray, has been approved in Canada for the adjunctive treatment (use along side other medicines) of both multiple sclerosis and cancer related pain. This medication may be legally imported into the United Kingdom and Spain on prescription. William Notcutt is one of the chief researchers that has developed Sativex, and he has been working with GW and founder Geoffrey Guy since the company's inception in 1998. Notcutt states that the use of MS as the disease to study "had everything to do with politics."
||Nausea of cancer chemotherapy that has failed to respond adequately to other antiemetics
||$4000.00 U.S. for a year's supply (in Canada)
|Nausea and vomiting associated with cancer chemotherapy in patients who have failed to respond adequately to conventional treatments
$652 U.S. for 30 doses @ 10 mg online
||Anorexia associated with AIDS–related weight loss
||Adjunctive treatment for the symptomatic relief of neuropathic pain in multiple sclerosis in adults
$9,351 Canadian per year
||Pain due to cancer
One of the major criticisms of cannabis as medicine is opposition to smoking as a method of consumption.
The United States Food and Drug Administration (FDA) issued an advisory against smoked medical marijuana stating that, "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. Furthermore, there is currently sound evidence that smoked marijuana is harmful."
The Institute of Medicine, run by the United States National Academy of Sciences, conducted a comprehensive study in 1999 to assess the potential health benefits of cannabis and its constituent cannabinoids. The study concluded that smoking cannabis is not recommended for the treatment of any disease condition, but did conclude that nausea, appetite loss, pain and anxiety can all be mitigated by marijuana. While the study expressed reservations about smoked marijuana due to the health risks associated with smoking, the study team concluded that until another mode of ingestion was perfected that could provide the same relief as smoked marijuana, there was no alternative. However, modern vaporizers and the ingestion of cannabis in a decarboxylated state have laid most of these concerns to rest. In addition, the study pointed out the inherent difficulty in marketing a non-patentable herb. Pharmaceutical companies will not substantially profit unless there is a patent. For those reasons, the Institute of Medicine concluded that there is little future in smoked cannabis as a medically approved medication. The report also concluded for certain patients, such as the terminally ill or those with debilitating symptoms, the long-term risks are not of great concern.
Marinol was less effective than the steroid megestrol in helping cancer patients regain lost appetites. A phase III study found no difference in effects of an oral cannabis extract or THC on appetite and quality of life (QOL) in patients with cancer-related anorexia-cachexia syndrome (CACS) to placebo.
The harm caused by smoking can be minimized or eliminated by the use of a vaporizer or ingesting the drug in an edible form. This risk is also thought to be decreased by processing the cannabis leaves into hemp oil.
Vaporizers are devices that heat the active constituents of cannabis in a partial vacuum and inhaling the vapors. Combustion of plant material is avoided, thus preventing the formation of carcinogens such as polyaromatic hydrocarbons, benzene and carbon monoxide. A pilot study led by Donald Abrams of UC San Francisco showed that vaporizers eliminate the release of irritants and toxic compounds, while delivering equivalent amounts of THC into the bloodstream.
In order to kill microorganisms, especially the molds A. fumigatus, A. flavus and A. niger, Levitz and Diamond suggested baking marijuana at 150 °C (302 °F) for five minutes. They also found that tetrahydrocannabinol (THC) was not degraded by this process.
A number of medical organizations have endorsed allowing patients access to medical marijuana with their physicians' approval. These include, but are not limited to, the following:
The use of cannabis, at least as fiber, has been shown to go back at least 10,000 years in Taiwan
. "Dà má" (Pinyin
pronunciation) is the Chinese expression for cannabis, the first character meaning "big" and the second character meaning "hemp."
Ancient China and Taiwan
Cannabis, called má 麻 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 men used hemp seed as food, it was quite natural for them to also discover the medicinal properties of the plant." The oldest Chinese pharmacopeia, the (ca. 100 CE) Shennong Bencaojing 神農本草經 ("Shennong's Materia Medica Classic"), describes dama "cannabis".
The flowers when they burst (when the pollen is scattered) are called 麻蕡 [mafen] or 麻勃 [mabo]. The best time for gathering is the 7th day of the 7th month. The seeds are gathered in the 9th month. The seeds which have entered the soil are injurious to man. It grows in [Taishan] (in [Shandong] …). The flowers, the fruit (seed) and the leaves are officinal. The leaves and the fruit are said to be poisonous, but not the flowers and the kernels of the seeds.
Cannabis is one of the 50 "fundamental" herbs in traditional Chinese medicine, and is prescribed to treat diverse indications.
Every part of the hemp plant is used in medicine; the dried flowers (勃), the achenia (蕡), the seeds (麻仁), the oil (麻油), the leaves, the stalk, the root, and the juice. The flowers are recommended in the 120 different forms of (風 feng) disease, in menstrual disorders, and in wounds. The achenia, which are considered to be poisonous, stimulate the nervous system, and if used in excess, will produce hallucinations and staggering gait. They are prescribed in nervous disorders, especially those marked by local anaesthesia. The seeds, by which is meant the white kernels of the achenia, are used for a great variety of affections, and are considered to be tonic, demulcent, alterative, laxative, emmenagogue, diuretic, anthelmintic, and corrective. They are made into a congee by boiling with water, mixed with wine by a particular process, made into pills, and beaten into a paste. A very common mode of exhibition, however, is by simply eating the kernels. It is said that their continued use renders the flesh firm and prevents old age. They are prescribed internally in fluxes, post-partum difficulties, aconite poisoning, vermillion poisoning, constipation, and obstinate vomiting. Externally they are used for eruptions, ulcers, favus, wounds, and falling of the hair. The oil is used for falling hair, sulfur poisoning, and dryness of the throat. The leaves are considered to be poisonous, and the freshly expressed juice is used as an anthelmintic, in scorpion stings, to stop the hair from falling out and to prevent it from turning grey. They are especially thought to have antiperiodic properties. The stalk, or its bark, is considered to be diuretic, and is used with other drugs in gravel. The juice of the root is used for similar purposes, and is also thought to have a beneficial action in retained placenta and post-partum hemorrhage. An infusion of hemp (for the preparation of which no directions are given) is used as a demulcent drink for quenching thirst and relieving fluxes.
In the early 3rd century AD, Hua Tuo was the first person known to use cannabis as an anesthetic. He reduced the plant to powder and mixed it with wine for administration.
The Ebers Papyrus (ca. 1,550 B.C.) from Ancient Egypt describes medical marijuana. Other ancient Egyptian papyri that mention medical marijuana are the Ramesseum III Papyrus (1700 BC), the Berlin Papyrus (1300 BC) and the Chester Beatty Medical Papyrus VI (1300 BC). The ancient Egyptians even used hemp (cannabis) in suppositories for relieving the pain of hemorrhoids. The egyptologist Lise Manniche notes the reference to "plant medical marijuana" in several Egyptian texts, one of which dates back to the eighteenth century B.C.
Surviving texts from ancient India confirm that cannabis' psychoactive properties were recognized, and doctors used it for a variety of illnesses and ailments. These included insomnia, headaches, a whole host of gastrointestinal disorders, and pain: cannabis was frequently used to relieve the pain of childbirth.
The Ancient Greeks used cannabis not only for human medicine, but also in veterinary medicine to dress wounds and sores on their horses.
In humans, dried leaves of cannabis were used to treat nose bleeds, and cannabis seeds were used to expel tapeworms. The most frequently described use of cannabis in humans was to steep green seeds of cannabis in either water or wine, later taking the seeds out and using the warm extract to treat inflammation and pain resulting from obstruction of the ear.
In the 5th century BCE Herodotus, a Greek historian, described how the Scythians of the Middle East used cannabis in steam baths.
Medieval Islamic world
In the medieval Islamic world, Arabic physicians made use of the diuretic, antiemetic, antiepileptic, anti-inflammatory, pain killing and antipyretic properties of Cannabis sativa, and used it extensively as medication from the 8th to 18th centuries.
An Irish physician, William Brooke O'Shaughnessy, is credited with introducing the therapeutic use of cannabis to Western medicine. He was Assistant-Surgeon and Professor of Chemistry at the Medical College of Calcutta, and conducted a cannabis experiment in the 1830s, first testing his preparations on animals, then administering them to patients in order to help treat muscle spasms, stomach cramps or general pain.
An advertisement for cannabis americana distributed by a pharmacist in New York
Cannabis as a medicine became common throughout much of the Western world by the 19th century. It was used as the primary pain reliever until the invention of aspirin. Modern medical and scientific inquiry began with doctors like O'Shaughnessy and Moreau de Tours, who used it to treat melancholia and migraines, and as a sleeping aid, analgesic and anticonvulsant.
By the time the United States banned cannabis in a federal law, the 1937 Marijuana Tax Act, the plant was no longer extremely popular. Skepticism about cannabis arose in response to the bill. The situation was exacerbated by the stereotypes promoted by the media, that the drug was used primarily by Mexican and African immigrants.
Later in the century, researchers investigating methods of detecting cannabis intoxication discovered that smoking the drug reduced intraocular pressure. In 1973 physician Tod H. Mikuriya reignited the debate concerning cannabis as medicine when he published "Marijuana Medical Papers". High intraocular pressure causes blindness in glaucoma patients, so he hypothesized that using the drug could prevent blindness in patients. Many Vietnam War veterans also believed that the drug prevented muscle spasms caused by battle-induced spinal injuries. Later medical use focused primarily on its role in preventing the wasting syndromes and chronic loss of appetite associated with chemotherapy and AIDS, along with a variety of rare muscular and skeletal disorders.
Later, in the 1970s, a synthetic version of THC, the primary active ingredient in cannabis, was synthesized to make the drug Marinol. Users reported several problems with Marinol leading many to abandon capsules and resume smoking the plant. Patients complained that the violent nausea associated with chemotherapy made swallowing capsules difficult. The effects of smoked cannabis are felt almost immediately, and it is therefore easily dosed. Marinol, like ingested cannabis is harder to titrate than smoked cannabis. Some studies have indicated that other chemicals in the plant may have a synergistic effect with THC.
In addition, during the 1970s and 1980s, six U.S. states' health departments performed studies on the use of medical cannabis. These are widely considered some of the most useful and pioneering studies on the subject. Voters in eight states showed their support for cannabis prescriptions or recommendations given by physicians between 1996 and 1999, including Alaska, Arizona, California, Colorado, Maine, Michigan, Nevada, Oregon, and Washington, going against policies of the federal government.
Cannabis female flowers closeup with trichomes
(white). These plant parts contain the highest concentration of medicinal compounds.
In May 2001, "The Chronic Cannabis Use in the Compassionate Investigational New Drug Program: An Examination of Benefits and Adverse Effects of Legal Clinical Cannabis" (Russo, Mathre, Byrne et al.) was completed. This three-day examination of major body functions of four of the five living US federal cannabis patients found "mild pulmonary changes" in two patients.
On October 7, 2003 a patent entitled "Cannabinoids as Antioxidants and Neuroprotectants" (#6,630,507) was awarded to the United States Department of Health and Human Services, based on research done at the National Institute of Mental Health (NIMH), and the National Institute of Neurological Disorders and Stroke (NINDS). This patent claims that cannabinoids are "useful in the treatment and prophylaxis of wide variety of oxidation associated diseases, such as ischemic, age-related, inflammatory and autoimmune diseases. The cannabinoids are found to have particular application as neuroprotectants, for example in limiting neurological damage following ischemic insults, such as stroke and trauma, or in the treatment of neurodegenerative diseases, such as Alzheimer's disease, Parkinson's disease and HIV dementia."
National and International Regulations
European laws on cannabis
possession (small amount). Data are from multiple sources detailed on the full source list
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."
In Austria both Δ9-THC and pharmaceutical preparations containing Δ9-THC are listed in annex IV of the Narcotics Decree (Suchtgiftverordnung). Compendial formulations are manufactured upon prescription according to the German Neues Rezeptur-Formularium.
On July 9, 2008 the Austrian Parliament approved cannabis cultivation for scientific and medical uses. Cannabis cultivation is controlled by the Austrian Agency for Health and Food Safety (Österreichische Agentur für Gesundheit und Ernährungssicherheit, AGES).
In Canada, the regulation on access to marijuana for medical purposes, established by Health Canada in July 2001, defines two categories of patients eligible for access to medical cannabis. Category 1 covers any symptoms treated within the context of providing compassionate end-of-life care or the symptoms associated with medical conditions listed below:
- severe pain and/or persistent muscle spasms from multiple sclerosis, from a spinal cord injury, from spinal cord disease,
- severe pain, cachexia, anorexia, weight loss, and/or severe nausea from cancer or HIV/AIDS infection,
- severe pain from severe forms of arthritis, or
- seizures from epilepsy.
Category 2 is for applicants who have debilitating symptom(s) of medical condition(s), other than those described in Category 1. The application of eligible patients must be supported by a medical practitioner.
The cannabis distributed by Health Canada is provided under the brand CannaMed by the company Prairie Plant Systems Inc. In 2006, 420 kg of CannaMed cannabis was sold, representing an increase of 80% over the previous year. However, patients complain of the single strain selection as well as low potency, providing a pre-ground product put through a wood chipper (which deteriorates rapidly) as well as gamma irradation and foul taste and smell.
It is also legal for patients approved by Health Canada to grow their own cannabis for personal consumption, and it's possible to obtain a production license as a person designated by a patient. Designated producers were permitted to grow a cannabis supply for only a single patient, however. That regulation and related restrictions on supply were found unconstitutional by the Federal Court of Canada in January, 2008. The court found that these regulations did not allow a sufficient legal supply of medical cannabis, and thus forced many patients to purchase their medicine from unauthorized, black market sources. This was the eighth time in the previous ten years that the courts ruled against Health Canada's regulations restricting the supply of the medicine.
In May, 2009, Health Canada revised their earlier regulations to permit licensed, designated producers to grow cannabis for a maximum of two patients. The move was called a "mockery" of the court's intention by lawyer Ron Marzel, who represented plaintiffs in the successful challenge in Federal Court to Health Canada's previously-existing rules. Marzel has announced plans to ask the court to overturn all prohibitions on cannabis use if Health Canada refuses to create regulations that will allow an adequate legal supply for use by medically-authorized patients.
In Germany dronabinol was rescheduled 1994 from annex I to annex II of the Narcotics Law (Betäubungsmittelgesetz) in order to ease research; in 1998 dronabinol was rescheduled from annex II to annex III and since then has been available by prescription, whereas Δ9-THC is still listed in annex I. Manufacturing instructions for dronabinol containing compendial formulations are described in the Neues Rezeptur-Formularium.
In Spain, since the late 1990s and early 2000s, medical cannabis underwent a process of progressive decriminalization and legalisation. The parliament of the region of Catalonia is the first in Spain have voted unanimously in 2001 legalizing medical marijuana, it is quickly followed by parliaments of Aragon and the Balearic Islands. The Spanish Penal Code prohibits the sale of cannabis but it does not prohibit consumption. Until early 2000, the Penal Code did not distinguish between therapeutic use of cannabis and recreational use, however, several court decisions show that this distinction is increasingly taken into account by the judges. From 2006, the sale of seed is legalized,, the sale and public consumption remains illegal, and private cultivation and use are permitted.
Several studies have been conducted to study the effects of cannabis on patients suffering from diseases like cancer, AIDS, multiple sclerosis, seizures or asthma. This research was conducted by various Spanish agencies at the Universidad Complutense de Madrid headed by Manuel Guzman, the hospital of La Laguna in Tenerife led neurosurgeon Luis González Feria or the University of Barcelona.
Several cannabis consumption clubs and user associations have been established throughout Spain. These clubs, the first of which was created in 1991, are non-profit associations who grow cannabis and sell it at cost to its members. The legal status of these clubs is uncertain: in 1997, four members of the first club, the Barcelona Ramón Santos Association of Cannabis Studies, were sentenced to 4 months in prison and a 3000 euro fine, while at about the same time, the court of Bilboa ruled that another club was not in violation of the law. The Andalusian regional government also commissioned a study by criminal law professors on the "Therapeutic use of cannabis and the creation of establishments of acquisition and consumption. The study concluded that such clubs are legal as long as they distribute only to a restricted list of legal adults, provide only the amount of drugs necessary for immediate consumption, and not earn a profit. The Andalusian government never formally accepted these guidelines and the legal situation of the clubs remains insecure. In 2006 and 2007, members of these clubs were acquitted in trial for possession and sale of cannabis and the police were ordered to return seized crops.
In the United Kingdom, if you are arrested or taken to court for possession of cannabis, you are asked if there are any mitigating factors to explain why it is in your possession. It is unknown whether this is solely a formality, or if an excuse of medical usage has ever been used successfully to reduce the penalty issued. However, in the United Kingdom, possession of small quantities of cannabis does not usually warrant an arrest or court appearance (street cautions or fines are often given out instead). Under UK law, certain cannabinoids are permitted medically, but these are strictly controlled with many provisos under the Misuse of drugs act 1971 (in the 1985 amendments). The British Medical Associations official stance is "users of cannabis for medical purposes should be aware of the risks, should enrol for clinical trials, and should talk to their doctors about new alternative treatments; but we do not advise them to stop."
In the United States, it is important to differentiate between medical cannabis at the federal and at the state level. At the federal level, cannabis per se has been made criminal by implementation of the Controlled Substances Act which classifies marijuana as a Schedule I drug, the strictest classification on par with heroin, LSD and Ecstasy, and the Supreme Court ruled in 2005 that the Commerce Clause of the U.S. Constitution allowed the government to ban the use of cannabis, including medical use. The United States Food and Drug Administration states "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".
On the state level, 14 states have legalized medical marijuana: Alaska, California, Colorado, Hawaii, Maine, Michigan, Montana, Nevada,, New Jersey, New Mexico, Oregon, Rhode Island, Vermont and Washington; Maryland allows for reduced penalties if cannabis use has a medical basis. California, Colorado, New Mexico, Maine, Rhode Island, and Montana are currently the only states to utilize dispensaries to sell medical cannabis. California's medical marijuana industry took in about $2 billion a year and generated $100 million in state sales taxes during 2008 with an estimated 2,100 dispensaries, co-operatives, wellness clinics and taxi delivery services in the sector colloquially known as “cannabusiness”. New Jersey has recently passed a bill legalizing marijuana for medicinal purposes.
On 19 October 2009 the US Deputy Attorney General issued a US Department of Justice memorandum to "All United States Attorneys" providing clear clarification and guidance to federal prosecutors in US States that have enacted laws authorizing the medical use of marijuana. The document is intended solely as "a guide to the exercise of investigative and prosecutorial discretion and as guidance on resource allocation and federal priorities." The US Deputy Attorney General David W. Ogden provided seven criteria, the application of which acts as a guideline to prosecutors and federal agents to ascertain whether a patients use, or their caregivers provision, of medical marijuana "represents part of a recommended treatment regiment consistent with applicable state law", and recommends against prosecuting patients using medical cannabis products according to state laws. Not applying those criteria, the Dep. Attorney General Ogden concludes, would likely be "an inefficient use of limited federal resources". The memorandum does not change any laws. Sale of cannabis remains illegal under federal law unless there is a very rare permission. The U.S. Food and Drug Administration's position, that marijuana has no accepted value in the treatment of any disease in the United States, has also remained the same. Nevertheless, the memorandum is seen by some United States commentators to be the first step in which President Obama's Administration may come good on its pre-election promise to address the issue of medical marijuana in federal policymaking.
Despite the Obama administration's vow not to raid and arrest medical marijuana patients and care-givers acting in compliance with state law as per Obama's campaign promise and the Ogden memorandum, DEA agent Jeffrey Sweetin ordered the raid and arrest of Chris Bartkowicz, a Colorado licensed medical marijuana care-giver, on February 12 2010.
The Health and Human Services Division of the federal government holds a patent for medical marijuana. The patent, "Cannabinoids as antioxidants and neuroprotectants", issued October 2003 reads: "Cannabinoids have been found to have antioxidant properties, unrelated to NMDA receptor antagonism. This new found property makes cannabinoids useful in the treatment and prophylaxis of wide variety of oxidation associated diseases, such as ischemic, age-related, inflammatory and autoimmune diseases. The cannabinoids are found to have particular application as neuroprotectants, for example in limiting neurological damage following ischemic insults, such as stroke and trauma, or in the treatment of neurodegenerative diseases, such as Alzheimer's disease, Parkinson's disease and HIV dementia…"
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