The adult population of a large mental hospital was screened for tardive dyskinesia (TD). Approximately 11% of the hospital population showed signs of TD; females and the elderly were over-represented in the TD group. A representative sample of those with TD was selected and a control (non-TD) patient was chosen to match each of the TD subjects in age, sex, length of hospitalization, diagnosis, and race. The charts of these subjects were searched for any indices of brain damage and the complete psychotropic medication history was recorded. There was no difference between the TD and controls in the amount of psychotropics ingested, in the duration of administration, in the kinds of drugs, or in the organicity history. Women as a group, however, tended to have more polypharmacy than men. The role of neuroleptics in TD is discussed as well as other possible etiological factors.

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