Understanding contraceptive failure

Best Pract Res Clin Obstet Gynaecol. 2009 Apr;23(2):199-209. doi: 10.1016/j.bpobgyn.2008.11.008. Epub 2009 Feb 14.


Contraceptive failure is a major source of unintended pregnancy. This chapter will review sources of data and measurement of contraceptive failure, summarize results from the literature on the risks of contraceptive failure during typical and perfect use for available methods of contraception, provide a tool for communicating risks of contraceptive failure to clients, examine determinants of contraceptive failure, and identify methodological pitfalls in the published literature.

Publication types

  • Review

MeSH terms

  • Contraception / methods*
  • Contraception Behavior
  • Equipment Failure / statistics & numerical data
  • Female
  • Humans
  • Models, Statistical
  • Pregnancy
  • Pregnancy, Unplanned*
  • Risk Assessment / statistics & numerical data
  • Treatment Failure