Mitragyna speciosa (commonly known as kratom, also ketum) is a tropical evergreen tree in the coffee family (Rubiaceae) native to Southeast Asia in the Indochina and Malaysia phytochoria (botanical regions). The leaves of kratom have been used as an herbal drug for centuries by the people of Southeast Asia. It is used in medicine as a stimulant (at low doses), sedative (at high doses), pain killer, treatment for opiate addiction and more.
At a low dose (1-5 g) of kratom, stimulant-like effects predominate. These are felt within 10 minutes and last for 1-4 hours. The primary stimulant-like effects of kratom are similar to amphetamine, though less intense, and include:
Moderate to high doses (5-15 g) of kratom have primarily opioid-like effects that last for several hours.
The euphoric "high" induced by the drug is reportedly less intense than other opioid drugs, and some users describe the experience as unpleasant, or dysphoric. Other opiate-like effects include: