Description

Levonorgestrel is a hormonal medication that is used in a number of birth control methods. It is combined with estrogen to make combination birth control pills.

If you take the pill within 72 hours after you’ve had unprotected sex, levonorgestrel can reduce the risk of pregnancy by up to 87% if taken as directed. If you take Plan B One-Step within 24 hours, it is much more effective.