Ethinylestradiol (EE), the active form of<unk> .<unk>  is a prodrug of ethinylestradiol (EE), with no estrogenic activity of its own. It is taken orally and has prolonged activity following a single dose, with a very long biological half-life of more than 120 hours (5 days) due to enhanced lipophilicity and storage in fat. Because of its much longer half-life,<unk>  is two to three times as potent as EE. Also because of its long half-life,<unk>  can be taken once a week or once a month. Following administration,<unk>  is absorbed via the lymphatic system, is stored in adipose tissue, and is gradually released from adipose tissue.
Quinestrol
Gestodene
Hexestrol
Allenestrol
Dimestrol
Dienestrol
Fosfestrol
Benzestrol