Development of the oral contraceptives.
D000818:Animals; D003276:Contraceptives, Oral / Q000266:history*; D003280:Contraceptives, Oral, Synthetic / Q000266:history*; D003281:Contraceptives, Postcoital; D004305:Dose-Response Relationship, Drug; D005260:Female; D049673:History, 20th Century; D006801:Humans; D009640:Norethindrone / Q000266:history; D009641:Norethynodrel / Q000266:history; D010060:Ovulation / Q000187:drug effects*; D011247:Pregnancy; D011374:Progesterone / Q000494:pharmacology*; D011647:Puerto Rico; D011817:Rabbits; D014481:United States
D003276:Contraceptives, Oral; D003280:Contraceptives, Oral, Synthetic; D003281:Contraceptives, Postcoital; D011374:Progesterone; D009641:Norethynodrel; D009640:Norethindrone