Emergency contraception that contains the same hormone used in many birth control pill, just at a higher dose. It should not be used as regular birth control because its not as effective. A backup plan that helps prevent pregnancy from happening after unprotected sex or birth control failure and is not for routine use. For use within 72 hours (3 days) after sex, but the sooner you take it, the better it works. Just one pill, so you get what you need right away.