Recurrent priapism as a side effect of zuclopenthixol decanoate.

Priapism has been described as a rare side effect of certain phenothiazine antipsychotics with high alpha1-adrenergic blocking potential. We describe a patient who in the course of clinical treatment with the thioxanthene antipsychotic zuclopenthixol (Clopixol) decanoate had several episodes of priapism. Although the alpha-blocking potential of zuclopenthixol is only moderate, it seems that in sufficient dose, or in combination with other antipsychotics, this drug is capable of inducing priapism.