Olanzapine plasma concentrations and clinical response in acutely ill schizophrenic patients.

Abstract:

:Olanzapine is an atypical antipsychotic effective in the treatment of schizophrenic patients. After a 2- to 9-day placebo lead-in, 79 inpatients with schizophrenia according to DSM-III-R criteria were placed on an olanzapine dosage of 10 mg/day or 1 mg/day for up to 6 weeks. Blood samples were obtained weekly during this period. Receiver operating characteristic curve analyses of Brief Psychiatric Rating Scale (BPRS) and Positive and Negative Syndrome Scale rating scale data suggested a minimum effective therapeutic concentration of 9 ng/mL. Using an intent-to treat analysis, 45% of the patients with olanzapine plasma concentrations > or = 9.3 ng/mL responded (> or = 20% decrease in BPRS), whereas only 13% of the patients with concentrations < 9.3 ng/mL responded. Use of olanzapine plasma concentrations of > 9 ng/mL as a predictor for treatment response in acutely ill schizophrenic patients is practicable because this therapeutic marker significantly increases the likelihood of a patient responding to olanzapine.

journal_name

J Clin Psychopharmacol

authors

Perry PJ,Sanger T,Beasley C

doi

10.1097/00004714-199712000-00006

subject

Has Abstract

pub_date

1997-12-01 00:00:00

pages

472-7

issue

6

eissn

0271-0749

issn

1533-712X

journal_volume

17

pub_type

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