title: Lactose intolerance following antithyroid drug medications.
abstract: We recently observed 2 lactase-deficient women with Graves' disease who consistently developed severe diarrhea after ingestion of thionamide (methimazole and propylthiouracil) tablets containing lactose as carrier. The strict temporal relationship between ingestion of lactose-containing tablets and appearance of intestinal symptoms, as well as the absence of side effects following ingestion of methimazole tablets without lactose as carrier, provided the clue for the diagnosis. To our knowledge, severe diarrhea resulting from carrier lactose has not been previously reported for antithyroid drugs, and should be considered in occasional cases of patients with gastrointestinal symptoms on thionamide therapy.
authors.affiliation: Cattedra di Endocrinologia, Università di Cagliari, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Petrini
authors.forename: P
authors.initials: P
authors.lastname: Usai
authors.forename: A
authors.initials: A
authors.lastname: Caradonna
authors.forename: R
authors.initials: R
authors.lastname: Cabula
authors.forename: S
authors.initials: S
authors.lastname: Mariotti
mesh_terms: D000328:Adult; D013956:Antithyroid Agents / Q000008:administration & dosage*; D003967:Diarrhea; D004337:Drug Carriers / Q000009:adverse effects*; D005260:Female; D006111:Graves Disease / Q000188:drug therapy* / Q000201:enzymology; D006801:Humans; D043322:Lactase; D007785:Lactose / Q000009:adverse effects*; D007787:Lactose Intolerance / Q000503:physiopathology*; D008713:Methimazole / Q000008:administration & dosage; D011441:Propylthiouracil / Q000008:administration & dosage; D001616:beta-Galactosidase / Q000172:deficiency
chemical_list: D013956:Antithyroid Agents; D004337:Drug Carriers; D008713:Methimazole; D011441:Propylthiouracil; D043322:Lactase; D001616:beta-Galactosidase; D007785:Lactose