title: Variable effects of nonsteroidal antiinflammatory agents on thyroid test results.
abstract: To investigate the effects of nonsteroidal antiinflammatory drugs (NSAIDs) on thyroid tests, 25 healthy subjects underwent a single-dose study and/or a 1-wk study. In the single-dose study, subjects received a single dose of one of six NSAIDs (aspirin, salsalate, meclofenamate, ibuprofen, naproxen, or indomethacin) at 0800 h. Total and free thyroid hormones and TSH were analyzed 0, 1, 2, 3, 4, and 8 h later. In the 1-wk study, subjects received one of six NSAIDs for 7 d. Thyroid hormones and TSH were analyzed at 0800 h each day. Total T(4) and total T(3) were measured by RIA, free T(4) and free T(3) were measured by equilibrium dialysis, and TSH was measured by immunometric assay. There were no changes in any hormones after a single dose or 1 wk of ibuprofen, naproxen, or indomethacin. Single-dose aspirin or salsalate decreased, whereas meclofenamate increased, various total and free thyroid hormone measurements. One week of aspirin or salsalate decreased total T(4), free T(4) (salsalate only), total T(3), free T(3), and TSH. These data confirm that aspirin, salsalate, and meclofenamate affect total and free thyroid hormone measurements and identify three NSAIDs that did not change thyroid tests. TSH remained within the normal range during acute or 1-wk administration of all of the NSAIDs.
authors.affiliation: Division of Endocrinology, Diabetes, and Clinical Nutrition, Oregon Health and Science University, Portland, Oregon 97201, USA. samuelsm@ohsu.edu
authors.forename: M H
authors.initials: MH
authors.lastname: Samuels
authors.forename: K
authors.initials: K
authors.lastname: Pillote
authors.forename: D
authors.initials: D
authors.lastname: Asher
authors.forename: J C
authors.initials: JC
authors.lastname: Nelson
mesh_terms: D000328:Adult; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage / Q000494:pharmacology*; D004334:Drug Administration Schedule; D005260:Female; D006801:Humans; D008297:Male; D011863:Radioimmunoassay; D013960:Thyroid Function Tests; D013974:Thyroxine / Q000097:blood*; D014284:Triiodothyronine / Q000097:blood*
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D014284:Triiodothyronine; D013974:Thyroxine