ACUTE dystonias, akathisias and Parkinsonism have long been recognized as extrapyramidal side effects that occur in susceptible persons who are taking any of the drugs used in the treatment of psychosis (Table 1).* These side effects often occur early in treatment, and they usually respond to dosage reduction or the addition of corrective medication. More recently, a quite different syndrome, tardive dyskinesia, has been found to be associated with antipsychotic drug use. Many aspects of the characteristics, etiology, prevention and treatment of this variegated set of symptom complexes are very unclear at present. However, patients who clearly show this syndrome . . .