Hallucinogen persisting perception disorder

Hallucinogen persisting perception disorder (HPPD) is a non-psychotic disorder in which a person experiences lasting or persistent visual hallucinations or perceptual distortions after using drugs such as psychedelics, dissociatives, deliriants, entactogens, cannabinoids, and SSRIs. Despite the name of this disorder, the specific contributory role of psychedelic drugs is unknown.

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