Delusion of pregnancy in a girl with drug-induced lactation.

The author presents the case of a psychotic girl who developed galactorrhea and a delusion of pregnancy while taking chlorpromazine. The delusion developed as a result of the interaction of the side effects of chlorpromazine and the psychological makeup characteristic of pseudocyesis patients. Galactorrhea and breast changes are often found among patients taking high doses of chlorpromazine and conflicts about pregnancy are frequent; thus delusions of pregnancy may often occur among female institutionalized patients treated with chlorpromazine.