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Sir: Priapism is one of the most serious adverse effects of psychotropic medications. It may be defined simply as abnormally prolonged erection of the penis (or clitoris) that is usually but not invariably painful. Though it is relatively rare as an adverse effect of psychotropic medication, as many as 25% to 40% of priapism cases are attributable to psychotropics.1,2‘ ‹’ ‹