What is Plan B®?
Plan B is a form of emergency contraception. It is a way to prevent pregnancy after unprotected sex (such as sex without contraception or when contraception fails – the condom broke, you missed two or more birth control pills, you missed your regular contraceptive shot, your diaphragm slipped). Plan B is not a substitute for regular contraception. Plan B does not protect you against sexually transmitted diseases. When taken within 72 hours of unprotected sex it is up to 85% effective in preventing pregnancy.
Plan B® is emergency contraception—a backup method of preventing pregnancy—and is not for routine use. It can reduce the chance of pregnancy when taken as directed up to 72 hours (3 days) after unprotected sex (if your regular birth control method fails, or if you’ve had sex without birth control).