Plan B^® works like a regular birth control pill. It prevents pregnancy mainly by stopping the release of an egg from the ovary, and may also prevent the fertilization of an egg (the uniting of sperm with the egg). Plan B^® may also work by preventing it from attaching to the uterus (womb). It is important to know that Plan B^® will not affect a fertilized egg already attached to the uterus; it will not affect an existing pregnancy.

Plan B^® is approved by the FDA and contains the hormone levonorgestrel, the same hormone in the birth control pills that healthcare professionals have been prescribing for more than 35 years. The difference is that Plan B^® contains a larger dose of levonorgestrel than the amount found in a single birth control pill.

Remember that Plan B^® is not RU-486 (the abortion pill). Because Plan B^® is used to prevent an unplanned pregnancy, it will not work if you’re already pregnant. If you take Plan B^® and are already pregnant, it will not affect your existing pregnancy.

View Important Safety Information and full Prescribing Information.