l-thyroxine, obtained from the thyroid gland of domesticated food animals or prepared synthetically; used for replacement therapy in hypothyroidism and for the prophylaxis and treatment of goiter and of thyroid cancer; administered orally, intravenously, or intramuscularly as the sodium salt.
An isomer of thyroxine, C15H10I4NO4, used in the form of its sodium salt to treat thyroxine deficiency.
Thyroid hormone as a sodium salt used to treat hypothyroidism. The drug is on the WHO official list. A brand name is Thyronine.