twenty-one-day treatment cycles of ethynylestradiol or mestranol at dosages of 50 to 100 mug per day were administered to 191 normal volunteer women from six cycles , followed by six cycles of this estrogen treatment combined with 2.5 mg. of norethindrone acetate , 2 mg. of megestrol acetate , or 0.5 mg. of norgestrel .
C0015011
ethynylestradiol
C0025506
mestranol