Levonorgestrel is used to prevent pregnancy after unprotected sexual intercourse.
What is Levonorgestrel?
Several birth control methods employ the hormone drug levonorgestrel. To create combination birth control tablets, it is coupled with an estrogen. It is effective within 72 hours of unprotected sex and is offered under the brand names Plan B and others as an emergency birth control. The medication's effectiveness decreases with elapsed time and ceases to function once pregnancy (implantation) has taken place. Levonorgestrel functions by preventing conception or ovulation. It reduces the likelihood of becoming pregnant by 57 to 93%. It works well for the long-term prevention of pregnancy with an intrauterine device (IUD), such as Mirena among others.
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