Mechanism of Action: How do levonorgestrel-only emergency contraceptive pills (LNG ECPs) prevent pregnancy?

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Description: 

This document includes evidence to respond to the question, “How do levonorgestrel-only emergency contraceptive pills (LNG ECPs) prevent pregnancy?” It was created by the International Federation of Gynecology & Obstetrics and the International Consortium for Emergency Contraception. In Spanish.

Bibliography: 
International Federation of Gynecology & Obstetrics and the International Consortium for Emergency Contraception