Ulipristal

**Semantic type:** Organic Chemical|Pharmacologic Substance

**Definition:** A selective progesterone receptor modulator with anti-progesterone activity. Ulipristal binds to the progesterone receptor (PR), thereby inhibiting PR-mediated gene expression, and interfering with progesterone activity in the reproductive system. As a result, this agent may suppress the growth of uterine leiomyomatosis. Furthermore, by inhibiting or delaying ovulation and effecting endometrial tissue, ulipristal can be used as an emergency contraception.

**Synonyms:** - 11-beta-(4-(dimethylamino)phenyl)-17-hydroxy-19-norpregna-4,9-diene-3,20-dione - ULIPRISTAL