Ethynodiol Diacetate as a New, Highly Potent Oral Inhibitor of Ovulation
Gregory Pincus 1,
Celso R. Garcia 1,
Manuel Paniagua 1, and
John Shepard 1
1 Worcester Foundation for Experimental Biology, Shrewsbury, Massachusetts, and Family Planning Association of Puerto Rico, Rio Piedras
Ethynodiol (17
-ethinyl-4- estrene-3,17-diol) diacetate, a potent progestin and oral inhibitor of ovulation in the rabbit, gives evidence of possessing antiovulatory activity when it is administered orally to women. When it is combined with an estrogen it provides adequate control of menstrual cyclicity, and, thus far, complete contraceptive effectiveness even in low daily doses.