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The sooner you take Plan B®, the more effective it is.

You only have a few days to prevent a pregnancy after unprotected sex or contraceptive failure (the condom slipped, or you missed your pill).

Every hour counts. If taken as directed within 72 hours (3 days) of unprotected sex, Plan B® reduces the chance of pregnancy by up to 89%. About 7 out of every 8 women who would have gotten pregnant will not get pregnant. And it works even better if you take it within the first 24 hours after unprotected sex. The first pill should be taken as soon as possible, and the second pill 12 hours later.

When shouldn't I take Plan B®?

Although safe and effective, Plan B® isn't right for everyone. Do not use Plan B®:

  • If you're already pregnant—because it won't work.
  • If you're allergic to levonorgestrel or any of the ingredients in Plan B®.
  • In place of regular birth control. Plan B® should not be used as routine birth control, as it isn't as effective. Plan B® won't protect you from HIV infection (the virus that causes AIDS) and any other sexually transmitted disease (STD).
72 Hours

Plan B® is up to 89% effective
if taken within 72 hours of
unprotected sex or
contraceptive failure.

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