ethinyl estradiol /eth″inil/ , an estrogen. ▪ INDICATIONS: It is prescribed in the treatment of postmenopausal breast cancer, menstrual cycle irregularities, prostatic cancer, and hypogonadism and for contraception and relief of menopausal vasomotor symptoms. ▪ CONTRAINDICATIONS: Thrombophlebitis, abnormal genital bleeding, known or suspected pregnancy, or known hypersensitivity to this drug prohibits its use. ▪ ADVERSE EFFECTS: Among the more serious adverse effects are thrombophlebitis, embolism, and hypercalcemia.