What we need to know about hallucinogen persisting perception disorder (HPPD)

This article was first published on October 23, 2022. It was last reviewed and updated on October 25, 2022. Hallucinogen persisting perception disorder (HPPD) is a condition in which, after the person is no longer using the hallucinogen, perceptual symptoms persist or are reexperienced. The diagnosis of hallucinogen persisting perception disorder (F16.983) is included in…