Two cases of psychiatric disorder temporally related to the abuse of hallucinogenic amphetamines 3, 4 methylenedi-oxymethamphetamine (MDMA), methylenedioxyamphetamine (MDA) and methylenedioxyethylamphetamine (MDEA) are described, suggesting that a variety of psychiatric morbidity may be precipitated by abuse of these drugs, including paranoid psychosis, mixed affective psychosis and symptoms of obsessive compulsive disorder.