title: Letter: Oral contraceptive failure due to drug interaction.
mesh_terms: D003276:Contraceptives, Oral / Q000378:metabolism*; D004347:Drug Interactions; D005260:Female; D006801:Humans; D011247:Pregnancy; D012293:Rifampin / Q000494:pharmacology*
chemical_list: D003276:Contraceptives, Oral; D012293:Rifampin