title: Meta-analysis of drop-out rates in randomised clinical trials, comparing typical and atypical antipsychotics in the treatment of schizophrenia.
abstract: OBJECTIVE
  To assess antipsychotic medication in the treatment of schizophrenia, based on trial drop-out rates.
  
  
  METHODS
  The studies included were randomised controlled trials that compared any of the four clinically best-established atypical antipsychotics (quetiapine, olanzapine, risperidone or clozapine) against either of two typical antipsychotics regarded as the gold standard (haloperidol or chlorpromazine).
  
  
  RESULTS
  Meta-analysis indicated less risk of all-cause patient withdrawal from atypical medication trials where dosage was flexible, in both the short, relative risk (RR) 0.70 (95% CI 0.64-0.76), P<0.00001, and long term, RR 0.72 (0.65-0.80), P<0.00001. Similar results were observed for withdrawal due to adverse events, RR: 0.54 (0.41-0.72), P<0.0001. Nevertheless, the favourable effects of atypical medication disappeared in trials relying on fixed dosage.
  
  
  CONCLUSIONS
  We detected a significant positive effect in terms of the outcome of treatment discontinuation for atypical versus typical medication, though only where the use of flexible rather than fixed doses (closer to an experimental control situation) was possible.
authors.affiliation: Department of Clinical Research, Castilla-La Mancha Health Research Foundation (FISCAM), Edificio Bulevar, C/Berna, No. 2, Local 0-2, 45003 Toledo, Castilla-La Mancha, Spain. jlrmartin@jccm.es
authors.forename: José Luis R
authors.initials: JL
authors.lastname: Martin
authors.forename: Víctor
authors.initials: V
authors.lastname: Pérez
authors.forename: Montse
authors.initials: M
authors.lastname: Sacristán
authors.forename: Fernando
authors.initials: F
authors.lastname: Rodríguez-Artalejo
authors.forename: Cristóbal
authors.initials: C
authors.lastname: Martínez
authors.forename: Enric
authors.initials: E
authors.lastname: Alvarez
mesh_terms: D014150:Antipsychotic Agents / Q000627:therapeutic use*; D006801:Humans; D010352:Patient Dropouts / Q000706:statistics & numerical data*; D016032:Randomized Controlled Trials as Topic; D012559:Schizophrenia / Q000188:drug therapy*
chemical_list: D014150:Antipsychotic Agents