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Plasma clozapine levels and clinical response for treatment-refractory schizophrenic patients
Am J Psychiatry 1995;152:179-182.
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Abstract

OBJECTIVE: The purpose of this study was to determine if plasma clozapine levels were associated with treatment response. METHOD: To examine this question, neuroleptic nonresponsive patients with schizophrenia or schizoaffective disorder were given clozapine, which was titrated to 500 mg/day by day 14 of treatment, and the dose was held fixed at least through day 21. Subsequently, clozapine doses were adjusted as clinically indicated, up to a maximum of 900 mg/day. Plasma clozapine levels were obtained at weeks 3 and 6, and standard clinical ratings (Brief Psychiatric Rating Scale [BPRS] and Clinical Global Impression) were done at baseline and at weeks 3 and 6. RESULTS: Data from 45 subjects were analyzed. There were no correlations between plasma clozapine levels and change in BPRS scores at treatment weeks 3 and 6. However, when the subjects were classified as responders or nonresponders, therapeutic response was associated with clozapine blood levels above 350 ng/ml. CONCLUSIONS: This study suggest that clozapine blood levels are correlated with clinical response.

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