Hallucinogen Persisting Perception Disorder (HPPD) is a disorder characterized by visual phenomena that appear following drug use. Under DSM-5 criteria, an HPPD diagnosis requires the visual changes be distressing or impairing. There are people who have the same or similar symptoms without distress.
While "hallucinogen" is in the name and psychedelics are the most frequently implicated drugs, other drugs (e.g. cannabis and MDMA) have been associated with the condition.
It often occurs in people
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