Exclusion criteria were a history of allergic reaction to letrozole, previous use of gonadotropin or letrozole, history of allergic reaction to gonadotropins, patients with abnormal semen analysis of the husband, patients with diagnosed uterine congenital anomalies, patients with diagnosed tubal block or tubal pathology discovered by prior hysterosalpingogram or diagnostic laparoscope, proved or suspected endometriosis proved by diagnostic laparoscope, hyperprolactinemia, and BMI more than 35 kg m 2 priligy and cialis together Medina DL, et al