Levonorgestrel, in the single-agent emergency Contraceptive form is indicated for the prevention of pregnancy
It inhibits the rupture of follicles and viable egg release from the ovaries.
Levonorgestrel suppress gonadotropins, inhibiting ovulation. Specifically, levonorgestrel binds to progesterone and androgen receptors and slows the release of gonadotropin-releasing hormone (GNRH) from the hypothalamus.