title: First chewable oral contraceptive.
mesh_terms: D003277:Contraceptives, Oral, Combined / Q000009:adverse effects / Q000737:chemistry; D017277:Drug Approval; D004338:Drug Combinations; D004997:Ethinyl Estradiol / Q000009:adverse effects / Q000737:chemistry; D005260:Female; D006801:Humans; D008409:Mastication; D009640:Norethindrone / Q000009:adverse effects / Q000737:chemistry
chemical_list: D003277:Contraceptives, Oral, Combined; D004338:Drug Combinations; C484525:ovcon 35; D004997:Ethinyl Estradiol; D009640:Norethindrone