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What Plan B One-Step is:

  • The # 1 OB/GYN recommended brand* of emergency contraception1
  • Easy to find in the family planning aisle of many retail stores when your patient needs it—available without a prescription or ID and with no age restriction
  • The brand chosen by millions of women3
  • Emergency contraception that contains levonorgestrel, the same hormone in many birth control pills—just at a higher dose. It should not be used as regular birth control because it is not as effective

What Plan B One-Step is NOT:

  • It is NOT an abortion pill
  • It will not work if a woman is already pregnant
  • It will not affect an existing pregnancy
  • It does not protect against HIV/AIDS or other sexually transmitted infections (STIs)
  • It should not be used if a patient is allergic to levonorgestrel or any other ingredients in Plan B One-Step

How does Plan B One-Step work?

Plan B One-Step is a progestin-only emergency contraception. Each tablet contains levonorgestrel, a hormone that has been used in birth control pills for several decades. Plan B One-Step contains a higher dose of levonorgestrel than birth control pills, but works in a similar way to help prevent pregnancy.

Plan B One-Step works primarily by:

  • Preventing ovulation

It may also work by:

  • Possibly preventing fertilization by altering tubal transport of sperm and/or egg
  • Altering the endometrium which may inhibit implantation

Plan B One-Step should be taken as soon as possible within 72 hours (3 days) after unprotected intercourse. The sooner it’s taken, the better it works.


If Plan B One-Step is taken as directed, it can significantly decrease the chance that a woman will get pregnant. About 7 out of every 8 women who would have gotten pregnant will not become pregnant after taking Plan B One-Step.

It is important to remind patients that Plan B One-Step is a backup method of preventing pregnancy and should not be used as regular birth control because it is not as effective.


Below you will find resources you can share with your patients and staff.

Plan B One-Step is a registered trademark of Foundation Consumer Healthcare. PBO-40759 June 2017. This site is intended for US audiences only.