psychiatrist

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Letter to the Editor

Inconclusive Evidence for the Efficacy of Olanzapine in the Treatment of Negative Symptoms in Schizophrenia

Brendan P. Murphy, FRANZCP, MRCPsych

Published: January 15, 2008

Article Abstract

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Sir: In a recent systematic review of the pharmacologictreatment of primary negative symptoms in schizophrenia, mycolleagues and I1 concluded that there was a paucity of evidenceregarding efficacy of treatments of primary negative symptomsand that the lack of standardized research designs had ledto marked inconsistencies in results. A case in point wasolanzapine’s efficacy against primary negative symptoms. Ofthe 4 conducted trials, the only study to use selected patientswith primary negative symptoms found no benefit2; 2 studiesusing path analysis suggested the reverse,3,4 while a third wasambivalent.5‘ ‹


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