For maximum effectiveness, emergency contraception should be started as soon as possible after unprotected intercourse, and within 120 hours. You can take emergency contraceptive pills anytime during your menstrual cycle.
April 14, 2015
- Zieman M. Emergency contraception. http://www.uptodate.com/home. Accessed March 4, 2015.
- FDA approves Plan B One-Step emergency contraceptive for use without a prescription for all women of child-bearing potential. U.S. Food and Drug Administration. http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm358082.htm. Accessed March 4, 2015.
- Shohel M, et al. A systematic review of effectiveness and safety of different regimens of levonorgestrel oral tablets for emergency contraception. BioMed Central Women's Health. 2014;14:54.
- Ella (prescribing information). Parsippany, N.J.: Watson Pharma Inc.; 2012. http://pi.watson.com/data_stream.asp?product_group=1699&p=pi&language=E. Accessed March 4, 2015.
- Plan B One-Step (prescribing information). Pomona, N.Y.: Duramed Pharmaceuticals Inc.; 2009. http://www.planbonestep.com/pdf/PlanBOneStepFullProductInformation.pdf. Accessed March 4, 2015.
- Koyama A, et al. Emerging options for emergency contraception. Clinical Medical Insights: Reproductive Health. 2013;7;23.