t4 -Thyro is used in the treatment of thyroid dysfunction and in the case of lack of secretion of thyroid hormones, as the thyroid gland works to regulate metabolic processes and represents a key role in the development and growth of the normal body as well as the nervous system, and its deficiency works to increase weight and stop growth and cause the person to feel tired and tired, so doctors prescribe t4 -Thyro to regulate dysfunction in the functions of Thyroid