Plan B One-Step is an emergency contraception designed to help prevent pregnancy before it starts when taken within 72 hours after unprotected sex or birth control failure. It is most effective when used promptly. It is not intended to affect an existing pregnancy. Usage should be according to the directions provided.

Plan B One-Step is an emergency contraception designed to help prevent pregnancy before it starts when taken within 72 hours after unprotected sex or birth control failure. It is most effective when used promptly. It is not intended to affect an existing pregnancy. Usage should be according to the directions provided.