Levonorgestrel is a medication used to prevent pregnancy after unprotected sex or after failure of another birth control method. It is an emergency contraceptive that is available over the counter at local pharmacies and is also known as the morning-after pill. Levonorgestrel is a first-line oral emergency contraceptive pill with approval from the World Health Organization to prevent pregnancy. It is FDA-approved to be used within 72 hours of unprotected sexual intercourse or when a presumed contraceptive failure has occurred. There have been cases of off-label efficacy for up to 96 hours. Levonorgestrel is not recommended for regular use as a contraceptive method.

Levonorgestrel is a synthetic hormone used in birth control pills for over 35 years. It works by preventing the release of an egg from the ovary or preventing fertilization of the egg by sperm. It may also work by changing the lining of the uterus (womb) to prevent development of a pregnancy. Levonorgestrel may prevent pregnancy, but it will not prevent the spread of human immunodeficiency virus (HIV, the virus that causes acquired immunodeficiency syndrome .

Levonorgestrel is available as a single tablet product or a two tablet product. If you are taking levonorgestrel as a single tablet product, take one tablet as soon as possible within 72 hours after unprotected sexual intercourse. If you are taking levonorgestrel as a two tablet product, take one tablet as soon as possible within 72 hours after unprotected sexual intercourse and take a second dose 12 hours later. It is important to use this medication exactly as directed by your doctor or follow the instructions on the package.