How does levonorgestrel work? how does it prevent pregnancy?

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2 Nov 2009

Levonorgestrel is a female hormone that prevents ovulation (the release of an egg from an ovary). It also causes changes in your cervical mucus and uterine lining, making it harder for sperm to reach the uterus and harder for a fertilized egg to attach to the uterus.

http://www.drugs.com/plan-b.html

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