- As replacement therapy in hypothyroidism of any etiology. 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 goiters, 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.