- As replacement therapy in hypothyroidism of any aetiology. Replacement therapy should not be instituted in transient hypothyroidism during the recovery phase of subacute Thyroiditis.
- For the suppression of Thyroid Stimulating Hormone (TSH) levels in the presence of goitres, nodules and after radiological and/or surgical treatment of Thyroid cancer.
- For the suppression of the goitrogenic effects of other drugs such as Lithium.
- As a diagnostic aid in suppression tests.