title: One-pill-a-month contraceptive.
mesh_terms: D000293:Adolescent; D000328:Adult; D002715:Chlormadinone Acetate / Q000494:pharmacology*; D002986:Clinical Trials as Topic; D004394:Dydrogesterone / Q000494:pharmacology*; D004997:Ethinyl Estradiol / Q000494:pharmacology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D009640:Norethindrone / Q000494:pharmacology*; D010060:Ovulation / Q000187:drug effects*; D011247:Pregnancy
chemical_list: D002715:Chlormadinone Acetate; D004997:Ethinyl Estradiol; D004394:Dydrogesterone; D009640:Norethindrone