evidence is presented from studies of the triphasic regimen of 0.5 mg norethindrone plus 35 micrograms ethinyl estradiol on the first seven menstrual cycle days , 0.75 mg norethindrone plus 35 micrograms ethinyl estradiol the second seven days , followed by 1 mg norethindrone plus 35 micrograms ethinyl estradiol for the final seven days .
C1260235
norethindrone
C0028356
norethindrone