Plan B One-Step Emergency Contraceptive (72 Hour Efficacy Window)

Plan B must be taken within 72 hours (3 days) after unprotected sex or birth control failure. The sooner it is taken the better it works. You can find Plan B yourself in the Family Planning aisle at all major retail stores. There is no prescription or ID required to purchase Plan B in any U.S. state, and there is no age restriction. Plan B temporarily delays ovulation or the release of an egg from the ovary. Plan B One-Step won't work if you are already pregnant and won’t impact an existing pregnancy. It should not be used as regular birth control.