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Kratom
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Close-up of bright green, veined kratom leaves (Mitragyna speciosa) growing on a plant outdoors. Kratom plant (Mitragyna speciosa) showing a large, dark green leaf and a round, spiky cream and orange flower. Explore Britannica's coverage on the history of the opioid crisis in the United States.
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Kratom: Media

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Kratom
The leaves of kratom (Mitragyna speciosa) contain a psychoactive alkaloid.
© Surachet Khamsuk/Dreamstime.com
Kratom in bloom
The leaves and flowers of kratom (Mitragyna speciosa). The plant is used...
© zulfachri zulkifli/Shutterstock.com

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Explore Britannica's coverage on the history of the opioid crisis in the United States.
The opioid epidemic is the worst drug crisis in U.S. history.
Encyclopædia Britannica, Inc.