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Family Rubiaceae
Mitragyna speciosa (Korth.) Havil.

Scientific names Common names
Mitragyna speciosa (Korth.) Havil. Lugub (Mand.)
Nauclea speciosa Miq . Mambog (Tag.)
Nauclea luzoniensis Blanco. Polapupot (Ibn.)
Nauclea korthaisii Steud. Kratom (Thai., Engl.)
Stephegyne speciosa Korth .  
Mitragyna speciosa (Korth.) Havil. is an accepted name The Plant List

Other vernacular names
MALAYSIA: Biak-biak, Ketum, Kutum.
THAI: Ketum, Kratom, Katuan, Krataum, Taum, Kratom, Ithang, Kakuan.
Street names
Thang, Kakuam, Thom, Ketum, Biak.

Mambog is a forest tree that grows to a height of 10 to 25 meters. Leaves are elliptic, 8.5 to 14 centimeters long, 5 to 10 centimeters wide, smaller at the ends of the branchlets, pointed at the tip, rounded or somewhat heart-shaped at the base, and hairy on the nerves beneath. Petioles are 2 to 4 centimeters long. Flowers are yellow, crowded in round, terminal inflorescences 3 to 5 centimeters long, the flowering heads consisting of up to 120 florets each. Calyx-tube is short and cup-shaped, with rounded lobes. Corolla tube is 5 millimeters long, smooth without and hairy within; the lobes 3 millimeters long, smooth and revolute in the margins. Fruit is oblong-ovoid and 5 to 7 millimeters long, with 10 ridges.

- In forests at low altitudes in Cagayan Province in Luzon; in Mindoro and Mindanao.
- Indigenous to Thailand, Malaysia, Myanmar.
- Also occurs in Borneo and New Guinea.

- Over 25 alkaloids have been isolated from kratom. The three most abundant indole alkaloids are mitragynine, paynanthine and speciogynine. Mitragynine is the primary active alkaloid in the plant.
- Mitragynine (C22H31O5N), an indole alkaloid, was first isolated from the leaves in 1907.

- Study of alkaloid constituents of young leaves have isolated mitragynine as the major constituent (66.2%), together with analogues, speciogynine (6.6%), speciociliatine (0.8%), and paynantheine (8.6%).
- Another indole, reported in the mid-90s, 7-hydroxymitragynine, C23H30,N2O5, is present in much lesser amounts, 2% of total alkaloids, but with the most potent opioid agonist and analgesic effect. On animal studies, the analgesic activity is reported to be 10x - 17x that of morphine. Other potency comparisons with morphine is from 6x, orally, with better oral absorption, and 2x, subcutaneously.
- The two alkaloids, mitragynine and 7-hydroxymitragynine, are mainly responsible for the effects of kratom. They are selective and full agonists of the µ-subtype opioid receptor MOR. The receptor agonist effects are antagonized by the opioid receptor antagonist naloxone.
- Chemical synthesis for several kratom alkaloids are too complex for economic production. However, mitragine can be used as chemical precursor to the more potent 7-hydroxymitragynine. (25)
- 7-hydroxymitragynine is considered 40 times more potent than MG at the mu opioid receptor level.
- 7α-hydroxy-7H-mitragynine (7-OH MG) is a minor constituent (2.0% based on the crude base (Ponglux et al. 1994)) of the leaves. The antinociceptive activity of 7-OH-MG is approximately 40-fold more potent than mitragynine and approximately 10-fold more potent than morphine (Matsumoto et al. 2004). (38)
- Another analogue, 9-hydroxycorynantheidine, a 9-dimethyl analogue of mitragynine, showed a partial agonist effect on opioid receptors in guinea-pig ileum.

- Alkaloidal extracts of leaves have showed very potent anti-inflammatory, analgesic and opioid properties.
- At low doses, kratom has
stimulant effects; at high doses, sedative-narcotic effects.
- Of the major alkaloids, mitragynine is a stimulant, and 7-hydroxymitragynine is sedative and analgesic acting primarily as an agonist at the u-opioid receptor.
- Mitragynine showed opioid-activity in animals. It inhibits electrically stimulated ileum and vas deferens smooth muscle contraction. Through action on centrally located opioid receptor, it inhibits gastric secretion and reduces pain response.
- At low doses, it produces increased alertness and energy, talkativeness and sociable behavior.
- At high dose, about 10 to 25 g of dried leaves, it causes sedative and euphoric effects and a narcotic analgesic (opium-like) effect. Early symptoms are sweating, dizziness, nausea, and dysphoria followed by euphoria and a dreamlike state that may last up to six hours.
- Long tern use causes anorexia, weight loss, insomnia, skin darkening, mouth dryness, frequent urination and constipation.
- A withdrawal syndrome may occur and manifest as emotional lability, hostility, aggression, aching muscles and bones, jerky movements of the limbs.
- CNS effects may include kratom psychosis, hallucinations, delusion, and confusion.
- Reported to possess morphine-like properties, antitussive, anesthetic, antinociceptive, analgesic.
- Kratom consumption can lead to addiction.
- Studies have suggested analgesic, sedative, antidiabetic, hypoglycemic, anti-inflammatory, antidepressant, antioxidant, antipyretic, antiproliferative properties.

Parts used


- Thai and Malaysian natives traditionally consume the leaves by chewing, smoking, or drinking it as tea, mainly for its euphoric and stimulant effect.
- No reported folkloric use in the Philippines.
- In Perak, pounded leaves applied to wounds.
- Whole heated leaves applied over enlarged spleens.
- Poultice of leaves applied to upper abdomen used for expulsion of worms in children.
- Long used in tropical areas for its opium- and coca-like effects.
- In Thailand and Malaysia, reported use as stimulant, to combat fatigue and enhance physical endurance.
- Leaves used for fever, coughs, malaria, diarrhea and as tonic.
- Leaves used to treat diarrhea, intestinal infections by amoeba and protozoa.
Abuse / Opioid Substitute / Recreational Use
- Kratom use is quite high in Southeast Asia, In Thailand alone, there is like over 1 million regular adult users. Globally fewer than 100 SAEs, primarily from Southeast Asia, have been reported—most cases were associated with co-administration or use of other chemical substances or drugs. (38)
- In Malaya, leaves are chewed, prepared as tea or infusion from leaves, or smoked as dried leaves or kratom resin. Opium smokers use it as a substitute in times of opium scarcity.
- A GC-MS analysis of freshly made Malaysian 'ketum' drinks, prepared from extended boiling of fresh leaves in water, a 250 ml glass yielded 22.5-25 mg of mitragynine. Three drinks a day is considered sufficient to diminish opiate withdrawal symptoms. (25)
- Often, one to three fresh leaves are chewed for the vigor and euphoria effects. The masticated material is swallowed, followed by drinking warm water, tea, or coffee.
- Leaves are also infused with hot or cold water and drunk as tea.
- Syrup may be smoked, in the manner of opium, in a pipe.
- Used to wean addicts off morphine.
- It is controlled in Thailand, Malaysia and Myanmar. In Australia, kratom and mitragynine were designated a 'most restricted' Schedule 9.
- In the United Kingdom, kratom is promoted as a "herbal speedball."
- When kratom is not available, leaves of Mitragyna parviflora (kaim) are used as substitute. (25)
- In southern Thailand, an ice-cold cocktail, "4x100", has become popular for its alcohol-mimicking effect. The cocktail is a mixture of three basic ingredient: kratom leaves, a caffeine-containing soft drink, and a codeine- or diphenhydramine-containing cough syrup, to which is added an anxiolytic, an antidepressant, or an analgesic. (25)
- Products are sold under the guise of Kratom. In the early 2000s, products labeled as 'kratom acetate' or mitragynine acetate' contained no mitragynine. In Germany and Sweden, a product called 'Krypton' was found to be a concoction of caffeine and synthetic O-desmethyltramadol (ODT), the latter a bioactive metabolite of synthetic opioid analgesic tramadol mimics the sedative-narcotic effects of kratom. (25)
- Kratom is often used in combination with other recreational drugs e.g., alcohol, marihuana, benzodiazepines, methandone, cocaine, amphetamines and halllucinogenic mushrooms and other NPS (novel psychoactive substances) like kava, mephedrone, synthetic cathinones, tryptamines, etc. (26)


Opioid Withdrawal Use: Kratom has been reported as a traditional alternative to manage drug withdrawal symptoms in Malaysia. Report described it as affordable and easily available with no serious side effects despite prolonged use, and allows self-treatment that avoids stigmatization as a drug dependent. The claims merit further and serious scientific investigation, with the potential as a low-cost alternative therapy, especially in developing countries. (1)
Analgesic / Behavioral Activities: Study on analgesic and behavioral activities of the methanol and alkaloid extracts of Mitragyna speciosa showed it possessed analgesic activity which partly acted at opioid receptors in the supraspinal opioid system. It produced no significant prolongation of latency in nociceptive response. (2)
Sedating Effects: Study results suggest that mitragynine possess sedative properties acting on the CNS of rats. The methanol and alkaloid extracts produced no significant changes in locomotor activity.
Urine Alkaloid Markers: Study reports a simple urine extraction procedure for routine GC-MS analysis and suggests two major alkaloids in urine samples as markers of kratom consumption: mitragynine and speciogynine.
Effect on Drug Metabolizing Enzyme Glutathione Transferases (GSTs): Data showed concentration-dependent inhibition of cytosolic GSTs when MS extract was added to the reaction mixture. Only MS aqueous extract at dosage of 100 mg/kg showed significant results. GSTs are dimeric enzymes involved in the detoxification of toxic and carcinogenic compounds in the cells. GSTs also act as antioxidant enzymes due to their selenium-independent GSH peroxidase activity. (4)
Anti-Diarrheal: Study showed methanolic extracts of leaves caused a dose-dependent protection against castor-oil induced diarrhea in rats and also inhibited intestinal transit. The anti-diarrheal effect was not antagonized by naloxone. The effect may occur via pathways in addition to the action on opioid receptors. (5)
Memory / Cognitive Behavioral Effects: Study suggests that the chronic administration of mitragynine can alter cognitive behavioral function in mice. (7)
Antinociceptive / Anti-Inflammatory: Study in rodents suggests the presence of potent antinociceptive and anti-inflammatory principles in the methanol extract, with significant dose-dependent activity in all nociceptive models and dose dependent suppression of carrageenan-induced paw edema. (8)
Antinociceptive: Study showed the antinociceptive effect of mitragynine was less potent than the crude extract of Mitragyna speciosa, suggesting that one or more minor constituents of MS may have a very potent antinociceptive effect.
Neuromuscular Blockade: Study investigated the effects of mitragynine and a methanolic extract of kratom leaves on neuromuscular junction and compound nerve action potential. The ME and mitragynine blocked nerve conduction, amplitude and duration of compound nerve action potential. Muscle contraction was greater with with extract. The dominant effect of the K extract was at the neuromuscular junction and not at the skeletal muscle or somatic nerve. (9)
Alcohol Withdrawal Benefit / Antidepressant Effect: Administration of the aqueous extract of MS at dose of 300 mg/K significantly inhibited ethanol-induced withdrawal behaviors such as rearing, displacement and head weaving. It also showed antidepressant activity without affecting spontaneous motor activity. (11)
Acute Toxicity Study: Oral administration of methanolic extract in rats resulted in increased blood pressure. The highest extract dose also induced acute severe hepatotoxicity and mild nephrotoxicity.   (12)
Mitragynine / Glucose Muscle Transport Effect / GLUT1: Study evaluated various leaf extracts and major constituent mitragynine for enhancement of glucose transport. Protein levels of glucose transporters (GLUTs) were measured by Western blotting. Results showed significant increase in rate of glucose intake, associated with increase in GLUT1 protein content. Increase glucose transport was associated with increases in activities of key enzymes dependent on the insulin-stimulated glucose transport for its acute action, and increases in the GLUT1 content for its long term effect. (6)
Cytochrome P450 Toxicity Study / Potential Herb Drug Interaction: Study evaluated the effects of M. speciosa alkaloid extract on human recombinant cytochrome P450 (CYP) enzyme activities. Results showed MSE has a most potent inhibitory effect on CYP3A4 and CYP2D6. MSE may contribute to an herb-drug interaction is administered concomitantly with drugs that are substrates for CYP3A4, CYP2D6, and CYP1A2. (15)
Hepatotoxicity: Case report from Germany describes a 25-year old man who developed intrahepatic cholestasis after taking an overdose of kratom power. (16)
Cross-Sectional Study / Malaysia: Of 562 respondents, 88% reported daily use. The main mode of use was drinking of extract as tea, 90%. Mean age was 28.3. Reasons for use: social and recreational needs, stamina and physical endurance, pain relief and improvement of sexual performance. As for use in weaning off opiate addiction, 87% said they were not able to stop using MS. (19)
Simulation Study on Rat Hippocampus Pyramidal Neuron Effect: Study evaluated the ability of Ketum alkaloid to block L-type Ca channel in rat's brain. Previous studies showed Mitragyna speciosa could block long lasting calcium channel currents in N1E-115 neuroblastoma cells. (21)
• Acute Toxicity Study / Leaves: Study investigated the acute toxicity of a standardized leaf aqueous extract on Sprague Dawley rats at 175, 500 and 2000 mg/kg body weight. The standardized MS aqueous extract did not cause lethality and only two symptoms at the highest dose, with no significant changes in body weight, food and water consumption. (also see: 11) (27)
• Subchronic Toxicity Testing: Study investigated the subchronic toxicity of methanolic extract of ketum in Sprague Dawley rats at doses of 100,, 200 and 500 mg/kg for 28 days. Biochemistry findings showed abnormalities in liver and renal parameters (ADT, creatinine, globulin, glucose, total protein, urea. Results showed M. speciosa is toxic to rat upon subchronic exposure of 28 days.(29)
• Dependence, Withdrawal and Craving in Regular Users: A cross-sectional Malaysian survey of 293 regular Kratom users showed that more than half of the regular users (>6 months of use) developed severe Kratom dependence problems, while 45% showed moderate Kratom dependence. Common physical withdrawal symptoms included muscle spasms and pain, sleeping difficulty, watery eyes/nose, hot flashes, fever, decreased appetite and diarrhea. Phychological withdrawal symptoms were restlessness, tension, anger, sadness, and nervousness. Average dose of mitragynine in a single dose of Kratom drink was 79 mg, suggesting an average intake of 276.5 mg daily. Regular users of more than 3 drinks a day were more likely to develop dependence, withdrawal and craving. (31)
• Antioxidant / Antiproliferative / Mitragynine: Study investigated the antioxidant value and anticancer functions of mitragynine (MTG) and its silane-reduced analogues (SRM) in vitro. SRM and MTG demonstrated moderate antioxidant value with ABTS assay (Trolox equivalent antioxidant capacity/TEAC): 2.25±0.02 mmol trolox/ mmol and 1.96±o.04 mmol trolox / mmol, respectively. Both showed concentration-dependent cytotoxicity effects and exerted profound antiproliferative efficacy at >100 µM concentration towards HCT 116 and K562 cancer cell lines, comparable to BA and 5-FY. (32)
• Comparative Study of MS and Mitragynine on Thermal Nociception in Rats: Study compared the effects of M. speciosa and mitragynine against effects of classic opioids, morphine and oxycodone, on thermal nociception in rats. Mitragynine showed analgesic effects similar to oxycodone when administered orally and IP, while M. speciosa failed to reach significant. Study results suggest further restrictions need to be place for the botanical in the consumer marketplace. (33)
• Effect of Adolescent Chronic Exposure to Kratom on Leaning and Memory in Adulthood: Study on chronic exposure to alkaloids present in legally available Kratom during adolescence is capable of producing a variety of subtle but lasting changes affecting spatial and working memory performance in adulthood, well after the exposure to Kratom has ended. (34)
• In-Utero Effects on Neural Tube Formation / Leaves: Study investigated the effects of in-utero administration of crude ethanolic extract of leaves of M. speciosa on neural tube formation in pregnant Sprague-Dawley rats. Study showed the crude extract of leaves of MS is capable of selective neurotoxicity and producing spina bifida like NTD (neural tube defect) as characterized by altered brain size and neural tube formation, a finding with important implication in the dependence liability associated with its use. (35)
• Abuse Potential / Adverse Cognitive Effects of Mitragynine: Studies on rodent models clearly suggest that mitragynine, the main alkaloids of the psychoactive herb, kratom, has significant abuse and addiction potential which can cause profound emotional and cognitive impairments resembling that of opiate and psychostimulant drugs. (36)
• Toxicity Studies: Toxicity in animal studies are claimed to be relatively low. Animal studies with doses as high as 920 mg/kg administered to dogs reported no toxicity in measures of tremors or convulsions. Another study reported lethal toxicity with oral dose of 200 mg of pure mitragynine to rats. Mitragynine and 7-hydroxymitragynine given to animals five days or longer produced physical dependence and withdrawal symptoms similar to opioid withdrawal. In humans, toxicity reports of seizures associated with kratom overdose. One toxicological report reported a mitragynine concentration of 167 ± 15 ng/mL. There have been toxicity reports and deaths attributed to krypton, a very potent form of kratom sold in Sweden. The interaction between mitragynine and O-desmethyltramadol in krypton was speculated as the cause of deaths. A U.S. case of human toxicity was attributed to the use of mitragynine, 7-hydroxymitragynine and propylexedrine use. Increased toxicity concerns are raised with the hazardous potential of mixing highly concentrated mitragynine and 7-hydroxymitragynine with other psychoactive drugs such as alcohol, sedatives, and cannabinoids. (37)
• Analytical Study: Study reports on a GC-MS method for the analysis of small kratom samples. The method successfully detected mitragynine, paynantheine, and/or 3-isopaynantheine. These are alkaloids specific to M. speciosa, which will allow identification of the test samples as kratom. (37)
• Factors Related to the Relative Abuse Potential of Mitragyna Speciosa (Kratom) and Mitragynine in the form of VivaZen: This is a written summary of oral testimony for the State of Wisconsin Controlled Substances Board commenting on the pharmacology of United Naturals marketed dietary supplement, VivaZen and its regulation. (38)
• Cerebellum and Endocannabinoid Receptors / Neurobiological Link for Mitragynine Abuse Liability: Mitragynine's potential as a psychoactive plant and opium substitute has emerged with abuse liability. Targets within the brain-reward circuitry are implicated in drug-induced synaptic plasticity of addiction. Given mitragynine's opioid agonism, study postulates that the ubiquitous and abundant endocannabinoid CB1R within the cerebellum may represent the novel neurochemical basis of mitragynine/Ketum abuse liabilities. Authors suggest further research is warranted to ascertain the role of CB1R as potential candidate within the cerebellum and its connection with brain rewards circuitry. (40)
• Cardiotoxicity of Mitragynine and Analogues: Study evaluated the cardiotoxicity of mitragynine and other chemical constituents isolated using human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMS). Data showed that mitragynine and its analogues, at concentrations close to plasma levels reported in lethal cases, exert significant cardiotoxicity by inhibiting hERG current, prolonging APD, and inducing arrhythmia. Results showed mitragynine and its analogues may potentiate Torsade de Pointes through inhibition of IKr (rapid delayed rectifier potassium current) in human cardiomyocytes.       (41)
• Inpatient Detoxification After Kratom Dependence: Study reports on detoxification and drug treatment of kratom dependence. Observations support the idea that kratom dependence syndrome is due to short-acting opioid receptor agonist activity, and suggest that dihydrocodeine and lofexidine are effective in supporting detoxification. (42)

DEA Info
Kratom / Drugs and Chemicals of Concern: Kratom has been used by natives of Thailand and other Southeast Asian regions as a herbal drug for decades, traditionally leaf-chewing as a herbal stimulant to overcome the fatigue associated with hard work. It has also been used as an opium substitute. and also to manage opium withdrawal symptoms in chronic opioid users. In 1943, Thailand passed Kratom Act 2486 that made the planting of the tree illegal. In 1979, the Thai government enacted Narcotics Act B.E. 2522, placing Kratom with marijuana in Category V of narcotics. It continues to be a popular drug in Thailand, rating in December 2006, as the third most popular drug in southern Thailand, after methamphetamine and marijuana. (14)
4X100: The 4x100 is a concoction reported used by Thai militants - a mixture of boiled kratom leaves, mosquito coils, and cola or a mixture of boiled cough syrup, kratom leaves and cola served with ice. The concoction is reported to to induce or increase "boldness" and "fearlessness."
Addiction: Consumption can lead to addiction. Long-term use can cause anorexia, weight loss, insomnia, skin darkening, dry mouth, frequent urination, and constipation.
Withdrawal: Symptoms consist of hostility, aggression, emotional lability, wet nose, achy muscles and bones, jerky extremity movements. Kratom psychoses has been observed, with hallucinations, delusions, and confusion.

Mutagenicity Study: With its potential for use in opioid withdrawal management, study was done to investigate any potential mutagenic effect. Studies have suggested indole alkaloids to possess antimicrobial activity. Results showed high dose mitragynine and total alkaloid extract of M. speciosa inhibited the growth of revertant colonies, suggesting mitragyine and total alkaloids of MS were non- mutagenic with antimicrobial activities.
DEA status / News Update: Kratom remains legal, for now! / On August 31, 2016, the Drug Enforcement Administration (DEA) published in the Federal Register a notice of intent to temporarily place mitragynine and 7-hydroxymitragynine, which are the main psychoactive constituents of the plant Mitragyna speciosa, also referred to as kratom, into schedule I pursuant to the temporary scheduling provisions of the Controlled Substances Act. Since publishing that notice, DEA has received numerous comments from members of the public challenging the scheduling action and requesting that the agency consider those comments and accompanying information before taking further action. In addition, DEA will receive from the Food and Drug Administration (FDA) a scientific and medical evaluation and scheduling recommendation for these substances, which DEA previously requested. The DEA is therefore taking the following actions: DEA is withdrawing the August 31, 2016 notice of intent; and soliciting comments from the public regarding the scheduling of mitragynine and 7-hydroxymitragynine under the Controlled Substances Act. DATES: The notice of intent that was published on August 31, 2016 (81 FR 59929) is withdrawn. The comment period will be open until December 1, 2016. (30)

Drug interactions
• Adverse drug interactions have been reported with the use of kratom with other drugs, i.e., carisoprodol, modafinil, propylhexedrine or herbal plant Datura stramonium.
• Fatal case reported in the U.S. involved a blend of kratom, fentanyl, diphenhydraine, caffeine and morphine sold as a herbal drug. (25)

- Wild-crafted.
- Leaves, powders, extracts, encapsulated powder and extract resin "pies" in the cybermarket.
- Seeds and trees reportedly sold by web vendors.

Last Update December 2016

IMAGE SOURCE: Large Mitragyna speciosa leaf / File:Mitragyna speciosa Leaf.JPG / Uomo Vitruviano / Creative Commons Attribution / Wikimedia Commons
OTHER IMAGE SOURCE: Mitragyna speciosa leaves / File:Mitragyna speciosa111.JPG / Uomo Vitruviano / GNU Free Documentation License / Wikimedia Commons
OTHER IMAGE SOURCE: Mitragyna speciosa / Flower and leaf / AllProHerbs

Additional Sources and Suggested Readings
The informal use of ketum (Mitragyna speciosa) for opioid withdrawal in the northern states of peninsular Malaysia and implications for drug substitution therapy / Balasingam Vicknasigam et al / The International Journal of Drug Policy,
Volume 21, Issue 4, Pages 283-288 (July 2010)
Effects of the extracts from Mitragyna speciosa Korth. leaves on analgesic and behavioral activities in experimental animals / Wantana Reanmongkol et al / Songklanakarin J. Sci. Technol., Vol.29 (Suppl. 1), March 2007 : Thai Herbs II
Analysis of Mitragyna speciosa (kratom) alkaloids in human urine as a marker of chronic kratom abuse: Preliminary results / Charoendee Pingsuthiwong et al / Bureau of Drug and Narcotics, Department of Medical Sciences, Ministry of Public Health, Nonthaburi 11000, Thailand.
In Vitro and in Vivo Effects of Three Different Mitragyna speciosa Korth Leaf Extracts on Phase II Drug Metabolizing Enzymes—Glutathione Transferases (GSTs)
/ Juzaili Azizi et al / Molecules 2010, 15, 432-441; doi:10.3390/molecules15010432
Inhibitory effects of kratom leaf extract (Mitragyna speciosa Korth.) on the rat gastrointestinal tract / Somsmorn Chittrakarn et al / doi:10.1016/j.jep.2007.11.032
Study on glucose transport in muscle cells by extracts from Mitragyna speciosa (Korth) and mitragynine / Juntipa Purintrapiban et al / Natural Product Research, 10 October 2008 / DOI: 10.1080/14786410802267627
Effects of mitragynine from Mitragyna speciosa Korth leaves on working memory / Evhy Apryani, M Taufik Hidayat, M A A Moklas, S Fakurazi and N Farah Idayu /
Journal of Ethnopharmacology, Vol 129, Issue 3, 16 June 2010, Pages 357-360 / doi:10.1016/j.jep.2010.03.036
Anti-Inflammatory and Antinociceptive Effects of Mitragyna speciosa Korth Methanolic Extract / W.M. Shaik Mossadeq, M R Sulaiman et al / Med Princ Pract 2009;18:378-384 (DOI: 10.1159/000226292)
The neuromuscular blockade produced by pure alkaloid, mitragynine and methanol extract of kratom leaves (Mitragyna speciosa Korth.) / Chittrakarn S, Keawpradub N et al / J Ethnopharmacol. 2010 Jun 16;129(3):344-9. Epub 2010 Apr 3.
Pharmacological Studies on 7-Hydroxymitragynine, Isolated from the Thai Herbal Medicine Mitragyna speciosa: Discovery of an Orally Active Opioid Analgesic / Kenjiro Matsumoto / 2006
Effect of Mitragyna speciosa aqueous extract on ethanol withdrawal symptoms in mice / Ekkasit Kumarnsit et al / Fitoterapia, Volume 78, Issue 3, April 2007, Pages 182-185 / doi:10.1016/j.fitote.2006.11.01
Acute toxicity study of the standardized methanolic extract of Mitragyna speciosa Korth in rodent. / Harizal SN, Mansor SM, Hasnan J, Tharakan JK, Abdullah J. / J Ethnopharmacol. 2010 Sep 15;131(2):404-9. Epub 2010 Jul 17.
Study on glucose transport in muscle cells by extracts from Mitragyna speciosa (Korth) and mitragynine. / Purintrapiban J, Keawpradub N, Kansenalak S, Chittrakarn S, Janchawee B, Sawangjaroen K. / Nat Prod Res. 2011 Sep;25(15):1379-87. Epub 2011 Jul 8.
KRATOM (Mitragyna speciosa korth) / US DEA, Office of Diversion Control
Evaluation of the Effects of Mitragyna speciosa Alkaloid Extract on Cytochrome P450 Enzymes Using a High Throughput Assay / Wai Mun Kong, Zamri Chik, Murali Ramachandra, Umarani Subramaniam, Raja Elina Raja Aziddin and Zahurin Mohamed / Molecules 2011, 16, 7344-7356 / doi:10.3390/molecules16097344
Intrahepatic Cholestasis Following Abuse of Powdered Kratom (Mitragyna speciosa) / Kapp FG et al. / J Med Toxicol 2011 April 29.
KRATOM (Mitragyna speciosa korth) / Drugs and Chemicals of Concern / DEA -Office of Diversion Control
Mitragyna speciosa use in the northern states of Malaysia: a cross-sectional study.
/ Ahmad K, Aziz Z. / J Ethnopharmacol. 2012 May 7;141(1):446-50. Epub 2012 Mar 14.
Should Kratom Use Be Legal? / By Larry Greenemeier / September 2013 / Scientific American
Simulation study of the effect of Mitragyna speciosa on hybrid current in rat hippocampus CA3 pyramidal neuron / Reza, F.; Begum, T. ; Ilmie, M.U. ; Hanif, M.C.L. ; Zhang, J. ; Abdullah, J.M. / Hybrid Intelligent Systems (HIS), 2011 11th International Conference
Pharmacology of Kratom: An Emerging Botanical Agent With Stimulant, Analgesic and Opioid-Like Effects / Walter C. Prozialeck, PhD Jateen K. Jivan, BS Shridhar V. Andurkar, PhD / JAOA Special Communication, Vol 112, No 12, December 20-12
Kratom Madness: How a Thai Tree Restarted Plant Prohibition / Maggie Volpo / Agriculture, Medical, News & Editorial, Science, / APR 28, 2014 / Ladybud
Mitragyna speciosa / Synonyms / The Plant List
Kratom (Mitragyna speciosa) drug profile / EMCDDA / European Monitoring Centre for Drugs and Drug Addiction.
Following “the Roots” of Kratom (Mitragyna speciosa): The Evolution of an Enhancer from a Traditional Use to Increase Work and Productivity in Southeast Asia to a Recreational Psychoactive Drug in Western Countries / Eduardo Cinosi, Giovanni Martinotti, Pierluigi Simonato, Darshan Singh, Zsolt Demetrovics, Andres Roman-Urrestarazu, Francesco Saverio Bersani, Balasingam Vicknasingam, 3 Giulia Piazzon, Jih-Heng Li, Wen-Jing Yu, Máté Kapitány-Fövény, Judit Farkas, Massimo Di Giannantonio, and Ornella Corazza* / Biomed Res Int. 2015; 2015 / doi: 10.1155/2015/968786
Acute Toxicity Study of Standardized Mitragyna speciosa Korth Aqueous Extract in Sprague Dawley Rats / Mohd Saleh Ahmad Kamal, Ahmad Rohi Ghazali , Noral Ashikin Yahya, Mohd Isa Wasiman & Zakiah Ismail / Journal of Plant Studies, Vol 1, No 2 (2012)
Genus Mitragyna: Ethnomedicinal uses and pharmacological studies / Fang Gong, Hai-peng Gu, Qi-tai Xu, Wen-yi Kang* / Phytopharmacology 2012, 3(2) 263-272
Subchronic toxicity study of standardized methanolic extract of Mitragyna speciosa Korth in Sprague-Dawley Rats / Mohd U. Ilmie, Hasnan Jaafar, Sharif M. Mansor and Jafri M. Abdullah* / ORIGINAL RESEARCH, 17 June 2015 / doi: 10.3389/fnins.2015.00189
The Kratom User's Guide / Version Date: Oct 12, 2016 / Daniel Siebert and "Sage Student"
Kratom (Mitragyna speciosa) dependence, withdrawal symptoms and craving in regular users
/ Darshan Singh, Christian P. Müller, Balasingam K. Vicknasingam / Drug and Alcohol Dependence, Vol 139, pp 132-137, June 1, 2014 / DOI: http://dx.doi.org/10.1016/j.drugalcdep.2014.03.017
Antioxidant value and antiproliferative efficacy of mitragynine and a silane reduced analogue. / Goh TB, Koh RY, Mordi MN, Mansor SM. / Asian Pac J Cancer Prev. 2014;15(14):5659-65.
A COMPARISON OF MITRAGYNA SPECIOSA AND MITRAGYNINE AGAINST OPIOIDS ON THERMAL NOCICEPTION IN RATS / Catherine Anne Criddle / Thesis: May 2015 / The University of Mississippi in partial fulfillment of the requirements of the Sally McDonnel Barksdale Honors College
An examination of the consequences of chronic exposure to Mitragyna speciosa during adolescence on learning and memory in adulthood / David M. Compton*, Corina Garcia, Annamaria V. Kamaratos, Brittany G. Johnson, Tegan Wedge / The Journal of Phytopharmacology 2014; 3(5): 300-309
In-Utero Effects of the Crude Ethanolic Extract of the Leaves of Mitragyna speciosa on Neural Tube Formation in Rats / Bala Y. Muhammad*, Abubakar D. Abdullahi*, Siti Nur Sharida Abd Kadir*, Tariq Bn. Abdul Razak* and Qamar U. Ahmed** / ASIAN J. EXP. BIOL. SCI. VOl 1 (2) 2010: 404 - 408
Abuse potential and adverse cognitive effects of mitragynine (kratom) / Nurul H. M. Yusoff*, Farah W. Suhaimi, Raja K. Vadivelu, Zurina Hassan, Anne Rümler, Andrea Rotter, Davide Amato, Hans C. Dringenberg, Sharif M. Mansor, Visweswaran Navaratnam* & Christian P. Müller* / Addiction Biology, 21, 98-110
MITRAGYNA SPECIOSA: AN ANALYTICAL STUDY / JACE A. DANIELS / THESIS (2015) / Partial fulfillment of the requirements for the degree of Master of Science , The University of Alabama at Birmingham
Focus of Testimony: Factors Related to the Relative Abuse Potential of Mitragyna Speciosa (Kratom) and Mitragynine in the form of VivaZen / Written Summary of Oral Testimony for the State of Wisconsin Controlled Substances Board August 14, 2015 / Jack E. Henningfield, PhD: Adjunct Professor of Behavioral Biology, The Johns Hopkins University School of Medicine
Kratom (Ketum) criminalisation successfully shelved in Malaysia / Fifa Rahman: Malaysian AIDS Council / Drug Law Reform
Cerebellum and Endocannabinoid Receptors: A New Possible Neurobiological Link for Mitragynine (Mitragyna Speciosa Korth) Abuse Liability. / Nanthini, J., et al. / J Addict Depend 1(1): 1-7. (2015) / DOI 10.15436/2471-061X.15.004
Evaluation of the Cardiotoxicity of Mitragynine and Its Analogues Using Human Induced Pluripotent Stem Cell- Derived Cardiomyocytes / Jun Lu, Heming Wei, Jianjun Wu, Mohd Fadzly Amar Jamil, Mei Lan Tan*, Mohd Ilham Adenan, Philip Wong, Winston Shim* / PLoS ONE 9(12): e115648. / doi:10.1371/journal.pone.0115648
A Case Report of Inpatient Detoxification after Kratom (Mitragyna speciosa) Dependence / McWhirter L, Morris S. / Eur Addict Res 2010;16:229–231 / DOI:10.1159/000320288

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