Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Levonorgestrel
Medically reviewed by Min Clinic Staff | Updated: January 2026
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.