Mitragyna speciosa (commonly known as kratom also ketum) is a tropical evergreen tree in the coffee family native to Southeast Asia. M. speciosa is indigenous to Thailand, Indonesia, Malaysia, Myanmar, and Papua New Guinea, where it has been used in traditional medicine since at least the 19th century. Kratom has opioid properties and some stimulant-like properties.
As of 2018, little is known of kratom's worth or safety as a therapeutic agent, since research into its use has been of poor quality. There is no evidence kratom is safe or effective for treating any condition. Some people take it for managing chronic pain, for treating opioid withdrawal symptoms, or - more recently - for recreational purposes. Onset of effects typically begins within 5 to 10 minutes and lasts 2 to 5 hours.
Common minor side effects may include nausea, vomiting, and constipation. More severe side effects may include respiratory depression (decreased breathing), seizure, addiction, and psychosis. Other side effects may include high heart rate and blood pressure, trouble sleeping, and, rarely, liver toxicity. When use is stopped, withdrawal may occur. Deaths have occurred with kratom both by itself and mixed with other substances. There were 44 kratom-related deaths in the United States between 2011 and 2017.
As of 2018, there is growing international concern about a possible threat to public health from kratom use. In some jurisdictions, its sale and importation have been restricted, and a number of public health authorities have raised alerts. Sometimes the finished product is mixed into cocktails with other psychoactive drugs such as caffeine and codeine.
Video Mitragyna speciosa
Description
Mitragyna speciosa is an evergreen tree that can grow to a height of 25 m (82 ft) tall and the trunk may grow to a 0.9 m (3 ft) diameter. The trunk is generally straight and the outer bark is smooth and grey. The leaves are dark green and glossy, and can grow to over 14-20 cm (5.5-7.9 in) long and 7-12 cm (2.8-4.7 in) wide when fully open, are ovate-acuminate in shape, and opposite in growth pattern, with 12-17 pairs of veins. The flowers grow in clusters of three at the ends of the branches. The calyx-tube is 2 mm (0.079 in) long and has 5 lobes; the corolla-tube is 2.5-3 millimetres (0.098-0.118 in) long.
M. speciosa is indigenous to Thailand, Indonesia, Malaysia, Myanmar, and Papua New Guinea.
Mitragyna speciosa was first formally described by the Dutch colonial botanist Pieter Korthals in 1839, who named it as such; it was renamed and reclassified several times before George Darby Haviland provided the final name and classification in 1859.
Maps Mitragyna speciosa
Uses
The United States Drug Enforcement Administration stated in 2013: "There is no legitimate medical use for kratom". Kratom has become popular as a recreational drug and has been promoted with claims that it can improve mood, relieve pain and help with opiate addiction. As of 2013, kratom and key extracts have been studied in cells and in animals, but no clinical trials have been conducted in the United States.
Opioid withdrawal
In 1836, kratom was reported to be used as an opium substitute in Malaysia. Kratom was also used as an opium substitute in Thailand in the 19th century.
Data on how often it is used worldwide are lacking as it is not detected by typical drug screening tests. Rates of kratom use appears to be increasing among those who have been self-managing chronic pain with opioids purchased without a prescription and are cycling (but not quitting) their use. As of 2018, there have been no formal trials to study the efficacy or safety of kratom to treat opioid addiction.
Traditional use
In cultures where the plant grows, it has been used in traditional medicine. The leaves are chewed to relieve musculoskeletal pain and increase energy, appetite, and sexual desire in ways similar to khat and coca. The leaves or extracts from them are used to heal wounds and as a local anesthetic. Extracts and leaves have been used to treat coughs, diarrhea, and intestinal infections. Kratom is often used by workers in laborious or monotonous professions to stave off exhaustion as well as a mood enhancer and/or painkiller. In Thailand, kratom was "used as a snack to receive guests and was part of the ritual worship of ancestors and gods." The herb is very bitter and is generally combined with a sweetener.
Recreational use
Across Southeast Asia, and especially in Thailand in the 2010s, a tea-based cocktail known as 4×100 became popular among some younger people. It is a mix of kratom leaves, cough syrup, Coca-Cola, and ice; as of 2011, people who consumed this were often viewed more negatively than users of traditional kratom, but not as negatively as users of heroin. As of 2012, use of the cocktail was a severe problem among youth in three provinces along the border with Malaysia.
In the US, as of 2015, kratom was available in head shops and over the internet; prevalence of use was unknown as of that time.
Adverse effects
At relatively low doses (1-5 g of raw leaves) at which there are mostly stimulant effects, side effects include contracted pupils and blushing; adverse effects related to stimulation include anxiety and agitation, and opioid-related effects like itching, nausea, loss of appetite, and increased urination begin to appear. At moderate (5 to 15 g of raw leaves) doses and higher, at which opioid effects generally appear, additional adverse effects include tachycardia (increased stimulant effect) as well as the opioid side effects of constipation, dizziness, hypotension, dry mouth, and sweating. Frequent use of high doses of kratom may cause tremor, anorexia, weight loss, seizures, and psychosis. If heavy users try to stop using kratom, they may experience withdrawal symptoms including irritability, feelings of distress, nausea, hypertension, insomnia, runny nose, muscle and joint pain, and diarrhea.
Serious toxicity is relatively rare and generally appears at high doses or when kratom is used with other substances.
In July 2016, the Centers for Disease Control (CDC) issued a report stating that between 2010 and 2015, US Poison Centers received 660 reports of exposure to kratom. Medical outcomes associated with kratom exposure were reported as minor (minimal signs or symptoms, which resolved rapidly with no residual disability) for 162 (24.5%) exposures, moderate (non-life-threatening, with no residual disability, but requiring some form of treatment) for 275 (41.7%) exposures, and major (life-threatening signs or symptoms, with some residual disability) for 49 (7.4%) exposures. One death was reported in a person who was exposed to the medications paroxetine (an antidepressant) and lamotrigine (an anticonvulsant and mood stabilizer) in addition to kratom. For 173 (26.2%) exposure calls, no effects were reported, or poison center staff members were unable to follow up again regarding effects.
Overdose of kratom is managed similar to opioid overdose, and naloxone can be considered to treat an overdose that results in a reduced impulse to breathe, despite mixed results for its utility, based on animal models.
Respiratory depression
Respiratory depression is a major risk with opioids, especially those that have activity at the mu-opioid receptor. This is the leading cause of death from opioid use. In animal studies at very high doses, mitragynine caused respiratory depression, but less than morphine or codeine. The respiratory effects of kratom and its main bioactive components have not been studied in people.
A 2016 CDC report on kratom exposures did not list respiratory depression as a risk of kratom, nor did a 2013 DEA report. The Food and Drug Administration in a July 2016 report does however list respiratory depression as one of the concerns. Some literature review articles do not list respiratory depression; however other literature reviews and some medical textbooks do name respiratory depression as a risk.
Liver toxicity
In rare cases, chronic use of kratom has been linked to acute liver injury with associated symptoms of fatigue, nausea, itching and jaundice. Liver injury is associated with cholestasis and may involve acute renal failure. As of 2016, the mechanism by which kratom causes liver damage in some people was poorly understood.
Death
Kratom has become a subject of concern in many countries because of the rising number of hospital visits and reports of deaths associated with its use. According to a 2016 review, "Although death has been attributed to kratom use, there is no solid evidence that kratom was the sole contributor to an individual's death." The US Food and Drug Administration has voiced concerns that kratom has contributed to deaths involving the use of illegal opiods or abuse of prescription opiates. Fifteen deaths in the United States between 2014 and 2016 were potentially kratom-related. Examples of other substances found in autopsies along with kratom have included: propylhexedrine; acetaminophen, morphine, and promethazine; temazepam, diphenhydramine, and dextromethorphan. (In this last case, levels of mitragynine were higher than those of other drugs, and there was pulmonary edema and other signs of opioid toxicity, and kratom was declared the possible cause of death). In an additional case, there were high levels of mitragynine and signs of opioid toxicity on autopsy. There were nine cases of death reported in Sweden in 2010 and 2011 relating to use of Krypton, which was kratom mixed with O-Desmethyltramadol.
Chemistry
The key psychoactive compounds in M. speciosa are mitragynine and 7-hydroxymitragynine (7-HMG), but there are more than 40 compounds in M. speciosa leaves, including about 25 alkaloids other than mitragynine and 7-hydroxymitragynine including ajmalicine, mitraphylline, mitragynine pseudoindoxyl, and Rhynchophylline. Other active chemicals in M. speciosa include raubasine (best known from Rauvolfia serpentina) and Pausinystalia johimbe alkaloids such as corynantheidine.
Mitragynine is about 60% of alkaloid extractions, while 7-hydroxymitragynine is about 2%. Mitragynine is structurally similar to yohimbine and voacangine.
Pharmacology
As of 2017, much of the pharmacology of kratom was not well understood, having stimulant effects at low doses, an opioid-like effect at higher doses, as well as sedative and sensory-suppressive effects.
Both mitragynine and 7-HMG are selective full agonists of the ?-opioid receptor; 7-HMG appears to have higher affinity. The stimulant effects appear to be mediated via prevention of activation of serotonin 5-HT2A receptors and postsynaptic ?2-adrenergic receptors. Rhynchophylline is a non-competitive NMDA antagonist found in kratom.
Mitragynine is metabolized in humans via phase I and phase II mechanisms with the resulting metabolites excreted in urine. In in vitro experiments, kratom extracts inhibited CYP3A4, CYP2D6, and CYP1A2 enzymes, which results in significant potential for drug interactions.
Detection in body fluids
The plant's active compounds and metabolites are not detected by a typical drug screening test, but can be detected by more specialized testing. Blood mitragynine concentrations are expected to be in a range of 10-50 ?g/L in persons using the drug recreationally. Detection in body fluids is typically by liquid chromatography-mass spectrometry.
Regulation
As of January 2018, neither the plant nor its alkaloids were listed in any of the Schedules of the United Nations Drug Conventions.
ASEAN
As of 2013, kratom was listed by ASEAN in its annex of products that cannot be included in traditional medicines and health supplements that are traded across ASEAN nations.
Australia and New Zealand
As of January 2015, kratom was controlled as a narcotic in Australia and under Medicines Regulations 1985 (Amended August 6, 2015) of New Zealand.
Canada
As of October 2016, it was not legal to market kratom for any use in which it was ingested, but could be marketed for other uses, such as incense. Health Canada has taken action against companies marketing it for ingestion.
Europe
In Europe, as of 2011, the plant was controlled in Denmark, Latvia, Lithuania, Poland, Romania and Sweden. In the UK, since 2016, the sale, import, and export of kratom are prohibited under the Psychoactive Substances Act.
Malaysia
The use of kratom leaves, known locally as 'ketum', is prohibited in Malaysia under Section 30 (3) Poisons Act 1952 and the user may be fined with a maximum amount of MYR 10,000 (USD 3,150) or up to 4 years imprisonment. Certain parties have urged the government to penalize the use of kratom under the Dangerous Drugs Act instead of the Poisons Act, which will carry heavier penalties.
Thailand
Possession of kratom leaves is illegal in Thailand. The Thai government passed the Kratom Act 2486, effective August 3, 1943, which made planting the tree illegal, in response to a rise in its use when opium became very expensive in Thailand and the Thai government was attempting to gain control in the opium market. In 1979, the Thai government placed kratom, along with marijuana, in Category V of a five category classification of narcotics. Kratom accounted for less than 2% of arrests for narcotics between 1987 and 1992.
The government considered legalizing kratom in 2004, 2009, and 2013.
United States
The FDA started working with other US agencies to seize shipments of imported kratom in 2014, as the product was being marketed as a dietary supplement but had never been shown to be part of the US diet nor to be Generally Recognized as Safe.
On 30 August 2016, the Drug Enforcement Administration (DEA) announced its intention to place the active materials in the kratom plant into Schedule I of the Controlled Substances Act as a warning about an imminent hazard to public safety, citing over 600 calls to poison control centers between 2010 and 2015 and 15 kratom-related deaths between 2014 and 2016. This drew strong protests among those using kratom to deal with chronic pain or wean themselves off opioids or alcohol. A group of 51 members of the US House of Representatives and a group of 9 senators each sent letters to Acting DEA Administrator Chuck Rosenberg protesting the listing and around 140,000 people signed an online White House Petition protesting it. The DEA noted the responses but said that it intended to go forward with the listing; a spokesman said: "We can't rely upon public opinion and anecdotal evidence. We have to rely upon science." In October 2016, the DEA withdrew its notice of intent while inviting public comments over a review period ending 1 December 2016.
As of May 2016, Alabama, Arkansas, Indiana, Tennessee, Vermont, and Wisconsin had made kratom illegal, and the US Army had forbidden soldiers from using it.
In November 2017, the FDA cited serious concerns over the marketing and effects (including death) associated with the use of kratom in the United States, stating that "There is no reliable evidence to support the use of kratom as a treatment for opioid use disorder; there are currently no FDA-approved therapeutic uses of kratom... and the FDA has evidence to show that there are significant safety issues associated with its use." In February 2018, the Commissioner of the FDA, Scott Gottlieb, released a statement describing further opioid-like properties of kratom and that it should not be used for any medical treatment or recreational use.
See also
- Pausinystalia johimbe
References
External links
- Mitragynine on ToxNet CASRN: 4098-40-2
- Kratom (Mitragyna speciosa), from the European Monitoring Centre for Drugs and Drug Addiction
Source of the article : Wikipedia
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