Levonorgestrel
pharmaceutical drug
Levonorgestrel is a hormonal medication which is used in many birth control methods.[1] It is combined with an estrogen to make combination birth control pills.[2] As an emergency birth control, sold under the brand names Plan B One-Step and Julie, among others, it is useful within 72 hours of unprotected sex.[3] The more time that has passed since sex, the less effective the medication becomes, and it does not work after pregnancy (implantation) has happened.
Levonorgestrel works by preventing ovulation or fertilization from happening.[4] It decreases the chances of pregnancy by 57–93%.[5]
References
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