Medical 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.
Last Editorial Review: 6/14/2012
Back to MedTerms online medical dictionary A-Z List
Need help identifying pills and medications?