Acute psychosis after mefloquine. Report of six cases.

A self-limiting psychosis characterized by acute onset of visual and auditory hallucinations and poor sleep developed in six adults between 8 and 24 hours after oral administration of 750-1500 mg of the antimalarial mefloquine. All patients had no personal or family history of psychosis and were neurologically and mentally normal before mefloquine ingestion. These cases illustrate that acute psychotic symptoms may occur in patients treated with mefloquine.