Effects of Thyroxine as Compared with Thyroxine plus Triiodothyronine in Patients with Hypothyroidism

Abstract
Patients with hypothyroidism are usually treated with thyroxine (levothyroxine) only, although both thyroxine and triiodothyronine are secreted by the normal thyroid gland. Whether thyroid secretion of triiodothyronine is physiologically important is unknown.