text: Drugs can profoundly affect thyroid function tests. Listed below is a selection of important effects.
  ↓: reduced serum concentration or structure parameter; ↑: increased serum concentration or structure parameter; ↔: no change; TSH: Thyroid-stimulating hormone; T: Total triiodothyronine; T: Total thyroxine; fT: Free thyroxine; fT: Free triiodothyronine; rT: Reverse triiodothyronine