In a perfect world, the peak of receptivity of the endometrial lining would occur simultaneously with the entry into the uterine cavity of a healthy blastocyst, which would then be able to adhere, attach, invade, and develop protected until the time of delivery. This would be the ideal scenario. The study was carried out on 200 infertile women who have thin , poorly vascularized endometrium, those patients were divided into five groups ; 40 patients in each group, group A received esterofem oral, group B received vagifem vaginal tablets, group C received sildenafil citrate gel, group D received pentoxifylline oral and group E received 4 grams of pentoxifylline vaginal gel. The endometrial thickness, vascularity zones, sub endometrial flow, and both uterine arteries resistance and pulsatility indices were assessed at the middle of the menstrual cycle (day 11–14) on a monthly basis for six cycles or until a positive pregnancy test was obtained. Pentoxifylline vaginal gel, pentoxifylline+ vitamin E capsule, and sildenafil vaginal gel have improved the vascularity indeces of endometrium and uterine arteries, while the vagifem and esterofem were less effective in terms of improving the vascularity indeces of endometrium and uterine arteries. The study also showed that 57.5% of women succeed to get pregnant after six months of receiving pentoxifylline vaginal gel, 35% of women succeed to get pregnant after six months of Pentoxifylline+vit E, while 22.5% of women succeed to get pregnant after six months of sildenafil, about 10% of women got pregnant after six months of vagifem, and finally 2.5% of women got pregnant after six months of receiving estrofem tablets. It was discovered that pentoxifylline vaginal gel, pentoxifylline tablet plus vitamin E capsule, and sildenafil vaginal gel were able to improve the vascularity index of the endometrium, the uterine arteries and endometrial thickness, and enhance the pregnancy rates in patients with thin poorly vascularized endometrium.