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Zaretsky, Schizophrenia Research, Vol. 11, pp. 3-8, 1993. (Tardive dyskinesia is a condition in which abnormal involuntary movements develop, producing serious neurologic disability. Some patients treated for schizophrenia with drugs such as chlorpromazine, develop this serious condition as a side effect of therapy. A major risk factor for development of this complication of neuroleptic therapy is current or past use of cannabis.)