One hundred thirty women with unexplained infertility participated in a prospective clinical study. Patients were assigned at random to one of two groups. The first group (n=65) served as the study group and was given clomiphene citrate 50 mg (Tecnovula®, Techno Pharmaceuticals, Egypt) and sildenafil (Respatio®, Pharma right group, Egypt) 20 mg tablets. The second group (n=65) served as a control and received a placebo tablet in addition to the standard treatment of clomiphene citrate 50 mg (Tecnovula®). A transvaginal ultrasound was performed on all of the patients to assess ovulation.

One hundred thirty women with unexplained infertility participated in a prospective clinical study. Patients were assigned at random to one of two groups. The first group (n=65) served as the study group and was given clomiphene citrate 50 mg (Tecnovula®, Techno Pharmaceuticals, Egypt) orally twice daily from the second day of their cycle through the seventh day and sildenafil (Respatio®, Pharma right group, Egypt) 20 mg tablets from the end of menstruation through ovulation. The second group (n=65) served as a control and received a placebo tablet in addition to the standard treatment of clomiphene citrate 50 mg (Tecnovula®). A transvaginal ultrasound was performed on all of the patients to assess ovulation, follicle count, and pregnancy. Consequences, including miscarriage, ectopic pregnancy, and multiple pregnancies, were monitored.

Inclusion Criteria:

• ages of 18 to 40
• patent tubes
• unexplained infertility
• regular menstrual cycle
• husband with normal sperm parameters

Exclusion Criteria:

• hypotension
• cardiovascular, renal and hepatic diseases
• uncontrolled diabetes mellitus
• anovulatory infertility
• abnormal thyroid functions
• ovarian cysts
• patients taking nitrates
• pelvic adhesions
• abnormal hormonal profile.
• hyperprolactinemia
• multiple uterine fibroids
• adenomyosis and endometriosis suspicion