What is Kratom?
Kratom (Mitragyna speciosa) is a tropical evergreen tree from Southeast Asia and is native to Thailand, Malaysia, Indonesia and Papua New Guinea. Kratom, the original name used in Thailand, is a member of the Rubiaceae family. Other members of the Rubiaceae family include coffee and gardenia. The leaves of kratom are consumed either by chewing, or by drying and smoking, putting into capsules, tablets or extract, or by boiling into a tea. The effects are unique in that stimulation occurs at low doses and opioid-like depressant and euphoric effects occur at higher doses. Common uses include treatment of pain, depression and to help prevent withdrawal from opiates (such as prescription narcotics or heroin), and for mild stimulation.
Traditionally, kratom leaves have been used by Thai and Malaysian natives and workers for centuries. The stimulant effect was used by workers in Southeast Asia to increase energy, stamina, and limit fatigue. However, some Southeast Asian countries now outlaw its use.
In the US, the herbal product has been used as an alternative agent for muscle pain relief, diarrhea, and as a treatment for opiate addiction and withdrawal. Patients with PTSD have reported positive effects. However, its safety and effectiveness for these conditions has not been clinically determined.
More than 20 alkaloids in kratom have been identified in the laboratory, including those responsible for the majority of the pain-relieving action, the indole alkaloid mitragynine. Mitragynine is classified as a kappa-opioid receptor agonist and is roughly 13 times more potent than morphine. Mitragynine, structurally similar to yohimbine, is thought to be responsible for the opioid-like effects.
Kratom, due to its opioid-like action, has been used for treatment of pain and opioid withdrawal but structurally it is not the same as the common opioids morphine or codeine. Studies suggest that the primary mitragynine pharmacologic action occurs at the mu and delta-opioid receptors, as well as serotonergic and noradrenergic pathways in the spinal cord. Stimulation at post-synaptic alpha-2 adrenergic receptors, and receptor blocking at 5-hydroxytryptamine 2A may also occur.