Of late, the term "tardive dyskinesia" has loomed in the literature to describe adverse effects of long-term therapy of psychoses with various neuroleptic drugs. In a sense, the term is partly a misnomer. Tardive means "late" and, therefore, is appropriate, but dyskinesia means "impairment of the power of movement." Rather than manifesting impairment, patients afflicted with tardive dyskinesias, while remaining fully alert, show a variety of grotesque involuntary muscular movements—perioral spasms, protrusion of the tongue, mandibular tics, and chronic contractions of other muscle groups.
According to AMA Drug Evaluations1 tardive dyskinesias are more likely to occur in older patients and, unfortunately, the troublesome facial distortions and other movements persist after the neuroleptic causative drug is withdrawn. Treatment with various drugs has been, generally, to no avail. However, last year Curran2 reported astonishingly excellent results in two badly afflicted patients when he administered thiopropazate in doses of 45 mg
Hussey HH. Tardive Dyskinesias. JAMA. 1974;228(8):1030. doi:10.1001/jama.1974.03230330060027