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Relationship between age and incidence of parkinsonism in psychiatric patients treated with haloperidol

Published Online:https://doi.org/10.1176/ajp.143.2.232

In a retrospective follow-up study of 230 psychotic patients treated with haloperidol, the incidence of parkinsonian side effects was greater in patients under 40 than in patients 40 years of age or older.

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