Effect of Vaginal Sildenafil Citrate on Endometrial Preparation and Outcome in Frozen Thawed Embryo Transfer Cycles

A total of 80 Patients who meet these conditions will enter the study and be divided into two groups based on randomized tables. To prepare the endometrium, Group A : 40 women are given oral estradiol valerate tablets 2mg 6-8 hourly from the day 2-14 of the cycle to prepare the endometrium Group B : 40 women are give sildenafil citrate 25mg vaginally every 6 hours (a half of 50 mg tablet is crushed and dissolved in 2cc of distilled water and injected in to vagina) starting from day 2-14 of the cycle, in addition to oral 2mg of estradiol valerat 6-8 hourly from the day 2-14 of the menstrual cycle . Estrogen and progesterone (prontogest 400mg pessaries ) are given 3 days prior to embryo transfer. Sildenafil is discontinued 48-72 hours prior to the embryo transfe due sildenafil may have some detrimental effects on endometrium in the implantation window