Liothyronine Sodium is a synthetic form of triiodothyronine (T3), the active thyroid hormone, widely used in the management of hypothyroidism, goiter, thyroid cancer, and certain diagnostic procedures. In hypothyroidism, Liothyronine Sodium restores normal metabolic activity, improving energy, growth, and overall body function. It is also prescribed to shrink goiters by stabilizing hormone levels and is used in thyroid cancer therapy to suppress thyroid-stimulating hormone (TSH), which can promote tumor growth. Clinicians may employ it in diagnostic tests to assess thyroid gland activity, and in emergencies such as myxedema coma, its quick onset makes it lifesaving.