title: An optimal contraceptive pill. (A clinical study).
mesh_terms: D003276:Contraceptives, Oral / Q000627:therapeutic use*; D003280:Contraceptives, Oral, Synthetic / Q000009:adverse effects / Q000627:therapeutic use*; D004334:Drug Administration Schedule; D004338:Drug Combinations; D004341:Drug Evaluation; D004967:Estrogens / Q000378:metabolism; D004997:Ethinyl Estradiol / Q000627:therapeutic use; D005260:Female; D006801:Humans; D008598:Menstruation; D009640:Norethindrone / Q000627:therapeutic use; D009644:Norgestrel / Q000627:therapeutic use; D010352:Patient Dropouts; D011372:Progestins / Q000378:metabolism
chemical_list: D003276:Contraceptives, Oral; D003280:Contraceptives, Oral, Synthetic; D004338:Drug Combinations; D004967:Estrogens; D011372:Progestins; D009644:Norgestrel; D004997:Ethinyl Estradiol; D009640:Norethindrone