MINISTRY OF HEALTH AND WELFARE Notice is hereby given, to commence a period of public comments for the draft amendment of "Schedules and Items of Controlled Drugs"
Drug Enforcement Administration (DEA) of U.S.A., DEA Announces Intent To Schedule Kratom, August 30, 2016. ( https://www.dea.gov/press-releases/2016/08/30/dea-announces-intent-schedule-kratom)
Walter C. Prozialeck, W. C., Jivan, J. K., Andurkar, S. V. Pharmacology of Kratom: An Emerging Botanical Agent With Stimulant, Analgesic and Opioid-Like Effects. J. Am. Osteopath. Assoc. 2012, 112, 792-799.
Yamamoto LT, Horie S, Takayama H, Aimi N, Sakai S, Yano S, Shan J, Pang PK, Ponglux D, Watandoe K. Opioid receptor agonistic characteristics of mitragynine pseudoindoxyl in comparison with mitragynine derived from Thai medicinal plant Mitragyna speciosa. Gen. Pharmacol. 1999, 33, 73–81.
Thongpradichote S, Matsumoto K, Tohda M, Takayama H, Aimi N,Sakai S, Watanabe H. Identification of opioid receptor subtypes in antinociceptive actions of supraspinally-administered mitragynine in Life Sci. 1998, 62, 1371-1378.
Suwanlert, S. A study of kratom eaters in Thailand. Bulletin on Narcotics 1975, 27, 21-27.
Food & Drug Administration of U.S.A., Statement from FDA Commissioner Scott Gottlieb, M.D., on the agency’s scientific evidence on the presence of opioid compounds in kratom, underscoring its potential for abuse, February 6, 2018.(https://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm595622.htm)