title: Placebo-controlled trials do not find association of olanzapine with exacerbation of bipolar mania.
abstract: BACKGROUND
  Published case reports describe apparent induction or exacerbation of manic-like symptoms during treatment with the atypical antipsychotics olanzapine and risperidone. To date, such reports are from uncontrolled clinical experience and therefore cannot clarify whether the atypical antipsychotics caused such manic-like states or simply failed to prevent them. Presumably, bipolar patients would be at increased risk for this putative adverse event. Therefore, we evaluated the potential of olanzapine to exacerbate symptoms of mania compared to placebo during treatment of bipolar mania.
  
  
  METHODS
  Two inpatient, double-blind, randomized trials investigating the efficacy of olanzapine 5-20 mg daily versus placebo for the treatment of acute mania were combined. Two hundred and fifty-four subjects participated (placebo n=129; olanzapine n=125) in the two studies. Severity of mania was quantified with the 11-item Young-Mania Rating Scale (Y-MRS). In a post-hoc analysis, after double-blind therapy up to 3 weeks, categorical comparison of olanzapine and placebo groups was made for any worsening and worsening by 10 or 20% from baseline Y-MRS scores (LOCF).
  
  
  RESULTS
  The percentage of subjects with exacerbation at endpoint were: any worsening, placebo 37.7%, olanzapine 21.8% (P=0.005); >or=10% worsening, placebo 24.6%, olanzapine 14.5% (P=0.039); >or=20% worsening, placebo 15.6%, olanzapine 8.1% (P=0.064).
  
  
  CONCLUSIONS
  Mania rating scores worsened for some patients during olanzapine therapy. However, this was significantly less common with olanzapine than with placebo. These controlled data suggest that clinical case reports of occurrence of 'mania' during treatment with olanzapine, and possibly those with other atypical antipsychotics, reflect exacerbation in the natural history of bipolar illness, rather than an adverse pharmacological effect.
  
  
  CONCLUSIONS
  Post-hoc analysis of pooled data from two different studies.
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Lilly Corporate Center, Drop Code 4133, Indianapolis, IN 46285, USA. baker@lilly.com
authors.forename: Robert W
authors.initials: RW
authors.lastname: Baker
authors.forename: Denái R
authors.initials: DR
authors.lastname: Milton
authors.forename: Virginia L
authors.initials: VL
authors.lastname: Stauffer
authors.forename: Alan
authors.initials: A
authors.lastname: Gelenberg
authors.forename: Mauricio
authors.initials: M
authors.lastname: Tohen
mesh_terms: D000328:Adult; D014150:Antipsychotic Agents / Q000494:pharmacology*; D001569:Benzodiazepines; D001714:Bipolar Disorder / Q000188:drug therapy* / Q000523:psychology; D018450:Disease Progression; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D000077152:Olanzapine; D010890:Pirenzepine / Q000031:analogs & derivatives* / Q000494:pharmacology*; D010919:Placebos; D012720:Severity of Illness Index; D016896:Treatment Outcome
chemical_list: D014150:Antipsychotic Agents; D010919:Placebos; D001569:Benzodiazepines; D010890:Pirenzepine; D000077152:Olanzapine