Sonali Notani

Hallucinogen Persisting Perception Disorder in a Young Adult Case Report.

Case Reports in Psychiatry September 3, 2026 Sonali Notani, Vikas Srinivasa, Serena Chaudhry et al.

Hallucinogen persisting perception disorder (HPPD) is a rare psychiatric diagnosis encompassing a range of perceptual disturbances caused by the lingering effects of hallucinogens. There are two major subtypes of the disorder: HPPD I and II. HPPD II is considered a more severe form that is generally longer-term, distressing, and requiring more intense treatment. In the limited available...