
Am J Psychiatry 156:309-311, February 1999
©Copyright 1999 American Psychiatric Association
Incidence of Tardive Dyskinesia in Early Stages of Low-Dose Treatment With Typical Neuroleptics in Older Patients
Dilip V. Jeste, M.D.,
Jonathan P. Lacro, Pharm.D.,
Barton Palmer, Ph.D.,
Enid Rockwell, M.D.,
M. Jackuelyn Harris, M.D., and
Michael P. Caligiuri, Ph.D.
OBJECTIVE: The authors studied the risk of tardive dyskinesia for older patients in the early stages of treatment with typical neuroleptics. METHOD: They examined the cumulative incidence of tardive dyskinesia 1, 3, 6, 9, and 12 months after the institution of neuroleptic therapy among 307 psychiatric outpatients over age 45. The patients' median dose was 68.4 mg/day of chlorpromazine equivalent. RESULTS: In the patients who had never received neuroleptics at baseline (N=87), the mean cumulative incidence of tardive dyskinesia was 3.4% and 5.9% at 1 and 3 months, respectively. There was no significant difference in the 12-month cumulative incidence of tardive dyskinesia among patients who had been neuroleptic-naive at baseline (22.3%) and the 89 patients who had received neuroleptics before baseline for 130 days (24.6%); however, the 131 patients who had received neuroleptics before baseline for more than 30 days tended to have a greater cumulative 12-month incidence of tardive dyskinesia (36.9%). CONCLUSIONS: The risk of tardive dyskinesia in older outpatients is high, even with relatively short treatment with low doses of conventional neuroleptics.
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