title: Potential failure of contraceptive efficacy in a patient taking methotrexate.
authors.forename: L
authors.initials: L
authors.lastname: Williamson
authors.forename: K
authors.initials: K
authors.lastname: Yein
mesh_terms: D000328:Adult; D018501:Antirheumatic Agents / Q000494:pharmacology*; D001172:Arthritis, Rheumatoid / Q000188:drug therapy*; D003277:Contraceptives, Oral, Combined / Q000494:pharmacology*; D004347:Drug Interactions; D005260:Female; D006801:Humans; D008598:Menstruation / Q000187:drug effects*; D008727:Methotrexate / Q000494:pharmacology*
chemical_list: D018501:Antirheumatic Agents; D003277:Contraceptives, Oral, Combined; D008727:Methotrexate