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Akinesia, a common side effect of antipsychotic drugs, often goes unrecognized by physician and patient. Akinetic apathy and lack of spontaneity can be mistaken for the negative symptoms of schizophrenia and add to the well-known social and emotional disability of schizophrenic patients on maintenance therapy. The authors attempted to identify a measure that might distinguish between akinesia and the negative symptoms of schizophrenia but found no relationship between plasma and saliva chlorpromazine levels or prolactin levels and akinesia. The fact that all of the akinetic but only 31% of the nonakinetic patients rated themselves as drowsy 12 hours after their bedtime dose indicates that drowsiness is a fairly accurate correlate of akinesia.
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