a group of 100 women desiring oc received one of the following four formulations on a randomized basis : ( 1 ) mestranol 50 micrograms and norethindrone 1 mg , , ( 2 ) ethinyl estradiol 50 micrograms and norethindrone 1 mg , ( 3 ) ethinyl estradiol 35 micrograms and norethindrone 1 mg , and ( 4 ) ethinyl estradiol 30 micrograms and levonorgestrel 150 mg .
C0025506
mestranol
C0015011
ethinyl estradiol