<unk>  <unk>  /ˌɛθ[invalid input: 'ɨ']n[invalid input: 'ɨ']lˌiːstrəˈdaɪ.əl/, also sometimes written as 17α-ethinyl estradiol,<unk> , ethynyl estradiol, or ethinyl œstradiol, is a derivative of 17β-estradiol (E2), the major endogenous estrogen in humans.<unk>  is an orally bioactive estrogen used in many formulations of combined oral contraceptive pills. It is one of the most commonly used medications for this purpose.
Transdermal<unk>  carries a greater risk of clot formation and venous thromboembolism than naturally occurring 17β-estradiol, which some have theorized to be related to different amounts of hepatic metabolism after absorption. The same contraindications and precautions apply for<unk>  as with other estrogen medications.
Estinyl was a preparation of<unk>  alone that was used for the management of menopausal symptoms and female hypogonadism.<unk>  is released into the environment as a xenoestrogen from the urine and feces of people who take it as a medication.
The major concern with unopposed estrogen (without progestogen) is of endometrial cancer.[citation needed] As such, the medication is generally prescribed with progesterone in the setting of birth control.
Ethinylestradiol
Desoxymethyltestosterone
Gestodene
Human menopausal gonadotropin
Medroxyprogesterone acetate 
Norgestrel
Leuprolide
Levonorgestrel 