Table 5

Drugs and thyroid function

Drug Free thyroxine Free triiodothyronine TSH
Amiodarone↑/↓↓/→↑/→/↓
Lithium
Phenytoin
Phenobarbitone↓/→
Phenothiazine, NSAIDS
β-Blockers
Corticosteroids↓/→↓/→
Heparin
Aspirin
Radiographic contrast
 medium
  • NSAIDS = non-steroidal anti-inflammatory drugs.