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Plan B One-Step emergency contraception is a backup plan that helps to prevent pregnancy after unprotected sex or birth control failure when used as directed. It’s the #1 OB/GYN recommended brand* of emergency contraception used by millions of women1,2 Plan B One-Step helps prevent pregnancy when used as directed within 72 hours (3 days) after unprotected sex or birth control failure. The sooner you take it, the better it works Plan B One-Step emergency contraception is a backup plan that helps to prevent pregnancy after unprotected sex or birth control failure. Use as directed. Plan B One-Step helps prevent pregnancy when used as directed within 72 hours (3 days) after unprotected sex or birth control failure. The sooner you take it, the better it works It’s generally safe and effective when used as directed Plan B One-Step will not work if you are already pregnant and won’t affect an existing pregnancy Plan B One-Step contains levonorgestrel, the same hormone used in many birth control pills for several decades, just at a higher dose. It’s a backup plan and should not be used as regular birth control because it is not as effective Find it in the aisle. There is no prescription or ID required, and there is no age restriction Plan B One-Step does not protect you against HIV/AIDS or other sexually transmitted diseases (STDs)