Cimetidine-induced psychosis in a 14-year-old girl

A 14-year-old girl presented with hallucinations and bizarre behaviour 3 days following the institution of cimetidine therapy for acute gastritis. She had no history of drug abuse or psychiatric disorders, and physical examination and laboratory investigations yielded no abnormalities. Within 24 hours after cimetidine therapy was discontinued her behaviour returned to normal and the hallucinations stopped.