Brand names: Plan B, ella, Next Choice

Pills taken after unprotected sex to prevent fertilization and pregnancy. To be effective, must be taken as soon as possible but no more than 5 days after unprotected sex. The sooner you take emergency contraception, the more effective it is at preventing pregnancy. Emergency contraception does not work if you are already pregnant. If you are at least 17 years old, you can go to the drug store and ask the pharmacist for emergency contraception. If you are younger than 17, a provider can write you a prescription.

 

Emergency contraception is a great backup plan when you need it but is not the most effective birth control. If you are trying to prevent pregnancy, consider trying one of the other more effective birth control methods. Read more.

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Emergency contraception does protect against HIV and STDs.

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Effectiveness based upon typical use.​