Admission requirements: Age 20 to 50 years,
Sperm concentration below 15 million per cc,
Percentage of progressive motile spermatozoa < 32%,
Total ejaculated spermatozoa<39*106,
Total motility <40%,
Normal serum levels of free testosterone, Prolactin, Luteinizing hormone, Follicle-stimulating hormone,
Conditions for not entering the study: Drug or alcohol abuse,
Concentration of white blood cells in semen > 106 per cc,
Possibility of being treated with gonadotropins, anabolic steroids, cancer chemotherapy, NSAIDs, infertility medications in the last two months,
Previous history of chemotherapy or radiotherapy for cancer,
Existence of palpable varicocele,
X-ray history of the past eight months,
Y chromosome microdeletion,
Karyotype alterations,
Testicular atrophy and testicular failure,
Other secondary causes of infertility,
A history of liver problems and a history of allergy to clomiphene,
Percentage of typical forms<4%,
Ejaculated volume <1.5 ml,
Abnormal serum levels of free testosterone, Prolactin, Luteinizing hormone, Follicle-stimulating hormone