Abstract: This present invention disclosed the use of mesoprogestins, a new class of progesterone receptor modulators (PRMs), for the treatment and prevention of benign hormone dependent gynecological disorders: a) for the treatment of gynecological disorder such as endometriosis, uterine fibroids, postoperative peritoneal adhesions, dysfunctional bleeding (metrorrhagia, menorrhagia) and dysmenorrhea; b) for the prevention of gynecological disorders such as postoperative, peritoneal adhesions, dysfunctional uterine bleeding (metrorrhagia, menorrhagia) and dysmenorrhea; and c) a method of treatment and prevention of the above mentioned disorders in a female, preferably in a human female, in need of treatment or prevention of one or more of these disorders, with an effective amount of a mesoprogestin. Mesoprogestins are defined as compounds possessing both agonistic and antagonistic activities at the progesterone receptor (PR) in vivo.