Plan B Emergency Contraceptive is intended for emergency use if you have had unprotected sex, or if another type of birth control failed. Plan B Emergency Contraceptive or generic Levonorgestrel is an over-the-counter female hormone that will temporarily suppress the ovulation process. This female hormone will also make it more difficult to become pregnant because it will change the uterine lining and cervical mucus so that sperm is less likely to reach the uterus, and a fertilized egg is less likely to attach to the uterus. The generic alternative is not manufactured by the company that makes the brand product.

Plan B Emergency Contraceptive will not terminate an existing pregnancy, and it should not be taken by women who are already pregnant. To be effective, Plan B Emergency Contraceptive must be taken within 72 hours of having unprotected sex. The use of condoms or other birth control methods can sometimes fail, or you may occasionally forget to use birth control. Plan B Emergency Contraceptive should be used in an emergency situation to avoid an unexpected pregnancy.