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Definition of Levonorgestrel

Levonorgestrel: A progestin. Named levonorgestrel because it is the levorotatory form of norgestrel. Used in combination with an estrogen as an oral contraceptive. Used alone for emergency contraceptive (in Plan B) and the treatment of menstrual disorders or endometriosis.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=30735
Last Editorial Review: 6/14/2012

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