Used in the treatment of hypothyroidism, where the thyroid gland does not produce enough thyroid hormone. It serves as a synthetic replacement for natural thyroxine, helping to restore normal hormone levels and regulate metabolism, energy, and overall growth and development. Also used in the management of goiter and thyroid cancer, particularly after thyroidectomy, to suppress thyroid-stimulating hormone (TSH) and prevent tumor recurrence. Commonly prescribed for both adult and pediatric patients requiring long-term thyroid hormone replacement therapy.