Clomiphene is a non-steroidal antiestrogen that stimulates ovulation. The mechanism of action is explained by the ability to specifically bind to estrogen receptors in the hypothalamus and ovaries. In small doses, the drug enhances the secretion of gonadotropic hormones (prolactin, follicle-stimulating and luteinizing) and stimulates ovulation. In large doses, the drug inhibits the secretion of gonadotropins. It does not exhibit gestagenic and androgenic activity.