Among 1,152 psychiatric inpatients who received a phenothiazine, a
butyrophenone, or a thioxanthene, 116 developed dystonia attributed to one
or more of these drugs. The highest frequencies of dystonia occurred among
recipients of haloperidol and the long-acting injectable fluphenazines. For
all patients at risk, dystonia was more common in men and in younger
patients. For chlorpromazine, high doses, male sex, and low age were each
positively associated with dystonia.