hallucinogen persisting perception disorder


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Psychiatry A non-drug-related recurrent recollection of a traumatic event, frightening experience or image, as may affect ex-soldiers, e.g., Vietnam veterans; the recurrence of a past memory, feeling, or perception
Substance abuse An involuntary recurrence of some aspect of a hallucinatory experience or perceptual distortion often with negative overtones and accompanied by fear and anxiety; flashbacks are an adverse effect classically associated with psychedelic drugs—e.g., LSD and PCP—which occur days to weeks after the last dose; flashbacks are common in heavy users and disappear with time
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

hallucinogen persisting perception disorder

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HPPD

Distorted sensory experiences (usually hallucinatory visual perceptions) that occur in those with a long history of illicit drug use.
Medical Dictionary, © 2009 Farlex and Partners

Hallucinogen persisting perception disorder (HPPD)

The recurrence of LSD effects after the drug experience has ended.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.