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25 years of Hallucinogen Persisting Perception Disorder- A diagnostic challenge

We present an interesting case of a forty eight year old man who took LSD in his early twenties. He continued to experience visual perceptual disturbances for 25 years following cessation of the hallucinogen. This is a unique case, where symptoms of hallucinogen persisting perception disorder have persisted for over two decades after the cessation of Lysergic acid diethylamide. He was treated with clonazepam 1 mg four times a day with good effect. There is a need for raising awareness about this condition to prevent misdiagnosis and delay in appropriate treatment.