Clinical and regulatory implications of active run-in phases in long-term studies for bipolar disorder

Acta Psychiatr Scand. 2014 May;129(5):328-42. doi: 10.1111/acps.12223. Epub 2013 Nov 30.


Objective: The integration of new treatments into the market and routine clinical practice should be dependent on robustness of evidence from randomised controlled trials (RCTs). We assessed study designs of long-term studies for bipolar disorder of all second-generation antipsychotics (SGAs) submitted to the Food and Drug Administration (FDA) and the completeness of evidence submitted to the regulatory agency.

Method: Systematic review of double-blind RCTs comparing SGAs with placebo or active drugs in adults. FDA website and electronic databases were searched until July 2013.

Results: Six placebo-controlled trials comparing aripiprazole, olanzapine, quetiapine and ziprasidone were found in the FDA website. Electronic searches found four additional RCTs about aripiprazole, olanzapine or quetiapine. All RCTs (either submitted to FDA or not) selected patients who responded to acute treatment to increase the treatment effect observed in the long-term phase (enrichment design). By contrast, in the prescribing information sheets for all SGAs, the reported indication was 'maintenance treatment of bipolar disorder'.

Conclusion: Extrapolation of results from enrichment studies to the more general population of patients should be carried out cautiously because average treatment benefits are likely to be less in unselected patients. Clear guidance for regulatory submission of RCTs is needed.

Keywords: affective disorders; antipsychotics; bipolar disorder; psychopharmacology; review of the literature.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review
  • Systematic Review

MeSH terms

  • Adult
  • Antipsychotic Agents* / classification
  • Antipsychotic Agents* / pharmacology
  • Bipolar Disorder / drug therapy*
  • Drug Approval / organization & administration
  • Evidence-Based Practice
  • Humans
  • Medication Therapy Management / legislation & jurisprudence*
  • Needs Assessment
  • Randomized Controlled Trials as Topic* / methods
  • Randomized Controlled Trials as Topic* / standards
  • Research Design / standards


  • Antipsychotic Agents