title: Plasma concentrations of ethynyl oestradiol and norethindrone after oral administration to women.
abstract: Plasma concentrations of ethynyl oestradiol and norethindrone in women were measured by radioimmunoassays after oral administration of 50 microng and 1000 microng respectively. The maximum values were obtained 1 h after administration. The calculated half-life was 6 1/2 h for ethynyl oestradiol and 7 h for norethindrone. At most 2-3% of the administered dose was present in the plasma at 1 h and had decreased to about 0-5% by 24 h.
mesh_terms: D000284:Administration, Oral; D004997:Ethinyl Estradiol / Q000008:administration & dosage / Q000097:blood*; D005260:Female; D006207:Half-Life; D006801:Humans; D009640:Norethindrone / Q000008:administration & dosage / Q000097:blood*
chemical_list: D004997:Ethinyl Estradiol; D009640:Norethindrone