Oral contraceptives and the prothrombin time.
D000818:Animals; D003276:Contraceptives, Oral / Q000494:pharmacology*; D004347:Drug Interactions; D005260:Female; D006801:Humans; D011517:Prothrombin Time; D051381:Rats; D014859:Warfarin / Q000494:pharmacology
D003276:Contraceptives, Oral; D014859:Warfarin