THYRO 3 is the brand name for liothyronine sodium, a hormone replacement therapy used to treat hypothyroidism. It helps restore hormone levels and control symptoms such as fatigue, weight gain, depression and constipation. This medicine is available in tablet form and can be taken orally. It is important to take THYRO 3 exactly as your doctor has told you. Used correctly, it can help you manage your data Hypothyroidism and improve your quality of life.