Used in the treatment of hypothyroidism to restore adequate thyroid hormone levels in patients with underactive thyroid. It helps regulate metabolism, energy production, and overall growth and development. Commonly prescribed in hormone replacement therapy, especially after thyroidectomy or in cases of thyroid hormone deficiency. Also utilized in the management of goiter and thyroid cancer to suppress thyroid-stimulating hormone (TSH). Effective when administered orally due to good intestinal absorption and long half-life, allowing once-daily dosing.