Progesterone is a female hormone important for the regulation of ovulation and menstruation. Progesterone is also important for the proper implantation of an embryo in the endometrium and for maintenance of the pregnancy.;NL;;NL;In women who are not pregnant and have not gone through menopause, this medication is used to:;NL;;NL; * restore normal menstrual periods that have stopped for several months (amenorrhea);NL; * treat abnormal bleeding from the uterus that is due to low hormone levels;NL; * treat endometriosis