Promestriene is a synthetic diethyl-ether of estradiol and a locally effective estrogen. Promestriene has an efficient action on vaginal atrophy while it is minimally absorbed [1][2].
[1]. Isabel Santos, et al. Urogenital Disorders Associated With Oestrogen Deficiency: The Role of Promestriene as Topical Oestrogen Therapy. Gynecol Endocrinol. 2010 Sep;26(9):644-51. [2]. Lino Del Pup, et al. Promestriene, a Specific Topic Estrogen. Review of 40 Years of Vaginal Atrophy Treatment: Is It Safe Even in Cancer Patients. Anticancer Drugs. 2013 Nov;24(10):989-98. [3]. AJO Almodovar, et al. Abstract P5-05-07: Promestriene effects on estrogen-sensitive breast cancer cell proliferation in vitro. Cancer Res 2013;73(24 Suppl): Abstract nr P5-05-07.