NCIt 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.;