DARK Classics in Chemical Neuroscience: Kratom

Area of Science:

• Ethnobotany
• Pharmacology
• Neuroscience

Background:

• Kratom (Mitragyna speciosa) is a Southeast Asian plant with a history of traditional use.
• Its primary psychoactive compounds are mitragynine and 7-hydroxymitragynine, which interact with opioid receptors.
• Mitragynine acts as an atypical opioid agonist, potentially offering analgesia with reduced side effects compared to traditional opioids.

Purpose of the Study:

• To review the traditional and medicinal applications of kratom.
• To explore the synthesis, pharmacology, metabolism, and structure-activity relationships of kratom's bioactive constituents.
• To discuss the societal impact and controversial nature of kratom in the United States.

Main Methods:

• Literature review of traditional uses, medicinal applications, and scientific research on kratom.
• Analysis of pharmacological data on mitragynine and 7-hydroxymitragynine.
• Examination of regulatory status and market trends in the United States.

Main Results:

• Mitragynine and its metabolite 7-hydroxymitragynine are key alkaloids in kratom with potent analgesic properties.
• 7-hydroxymitragynine is significantly more potent than mitragynine and morphine.
• Kratom is marketed in the U.S. as an herbal supplement for pain, anxiety, and depression, generating substantial annual sales.

Conclusions:

• Kratom presents a complex profile as an atypical opioid agonist with potential therapeutic benefits and abuse concerns.
• Its unregulated status in the U.S. contrasts with criminalization in other countries, highlighting a significant societal debate.
• Further research into kratom's pharmacology and long-term effects is crucial for informed policy and public health decisions.