Ulipristal acetate (CDB-2914) is an orally bioavailable selective progesterone receptor modulator with anti-progesterone activity. It binds to the progesterone receptor (PR), inhibiting PR-mediated gene expression and interfering with progesterone activity in the reproductive system, potentially suppressing the growth of uterine leiomyomatosis. Additionally, ulipristal can be used as emergency contraception by inhibiting or delaying ovulation and affecting endometrial tissue.
