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  • Title: Patient response and resource management: another view of clozapine treatment of schizophrenia.
    Author: Carpenter WT, Conley RR, Buchanan RW, Breier A, Tamminga CA.
    Journal: Am J Psychiatry; 1995 Jun; 152(6):827-32. PubMed ID: 7755110.
    Abstract:
    OBJECTIVE: Issues in clozapine treatment were considered in terms of implications for resource management. METHOD: A critical review of the literature on time course and pattern of response to clozapine was used to address treatment of negative symptoms, late responders, and extent of clinical benefit in ordinary settings. RESULTS: Superior efficacy of clozapine for partial and poor neuroleptic responders is observed in about one-half of the cases. Response is rapid once a therapeutic dose is reached, and the data do not support the proposition that some patients first respond only after 3-12 months of therapy. The cumulative benefit over several months of treatment and the broad range of symptoms involved in response are similar to those for typical neuroleptic drugs, suggesting that clozapine's superiority is based on greater effectiveness rather than a unique profile of treatment effects. Clozapine appears to be effective for secondary, but not primary, negative symptoms. Modal response is moderate, and extensive rehabilitation and clinical services are required to substantially enhance functional outcome. CONCLUSIONS: Many more patients merit trials with clozapine. Economic costs and adverse drug effects can be minimized by selecting patients most likely to benefit and discontinuing clozapine treatment when benefit is not observed within 2-4 months. Appropriate patients include 1) those with good responses to typical neuroleptics who experience substantial adverse effects and 2) those whose disorders respond poorly to standard neuroleptics and are defined by psychotic symptoms, thought disorder, and hostility. Treatment of primary negative symptoms is not supported by the current experimental data.
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