title: Smokers and nonsmokers equally affected by olanzapine-induced weight gain: metabolic implications.
abstract: OBJECTIVE
  To examine the impact of smoking status on antipsychotic-associated weight gain.
  
  
  METHODS
  In two double-blind studies, 552 adult and elderly patients with schizophrenia or schizoaffective disorder were randomly assigned to risperidone or olanzapine treatment for 8 weeks. Smoking status at baseline was recorded together with other background characteristics.
  
  
  RESULTS
  In both adult and elderly patients, olanzapine-treated smokers and nonsmokers gained weight at a similar rate, whereas risperidone-treated smokers gained less weight than did nonsmokers. Olanzapine was associated with significantly greater weight gain than was risperidone across all measures in both adult and elderly patients.
  
  
  CONCLUSIONS
  These findings support a quantitatively or qualitatively different effect of risperidone and olanzapine on the metabolic changes underlying antipsychotic-associated weight gain. Mechanisms responsible for olanzapine's effect on weight appear to counteract smokers' physiologic bias toward weight loss, an effect not seen among risperidone-treated patients.
authors.affiliation: CNS Medical Affairs, Janssen Pharmaceutica Products, LP, 1125 Trenton-Harbourton Road, Titusville, NJ 08560-0200, USA. rlasser@janus.jnj.com
authors.forename: Robert A
authors.initials: RA
authors.lastname: Lasser
authors.forename: Lian
authors.initials: L
authors.lastname: Mao
authors.forename: Georges
authors.initials: G
authors.lastname: Gharabawi
mesh_terms: D000328:Adult; D014150:Antipsychotic Agents / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use*; D001569:Benzodiazepines / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D000077152:Olanzapine; D011618:Psychotic Disorders / Q000188:drug therapy* / Q000378:metabolism*; D018967:Risperidone / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use*; D012559:Schizophrenia / Q000188:drug therapy* / Q000378:metabolism*; D012907:Smoking; D015430:Weight Gain / Q000187:drug effects*
chemical_list: D014150:Antipsychotic Agents; D001569:Benzodiazepines; D018967:Risperidone; D000077152:Olanzapine