If hypothyroidism, or hypothyroidism, has been diagnosed, lifelong supplementation with eugenol, also called levothyroxine sodium, is required. If the thyroid gland has been removed for any reason, or if it has been partially removed, resulting in artificial hypothyroidism, you will also need to take levothyroxine sodium for the rest of your life to supplement the lack of endogenous thyroxine production. The scientific name of Euthyrox is levothyroxine sodium, a naturally occurring hormone in the body that maintains normal physiological function. If the thyroid gland does not produce enough levothyroxine, it will lead to hypothyroidism, so exogenous supplementation of levothyroxine sodium, also known as eugenol, is necessary. Therefore, if the thyroid gland is defective or partially removed due to trauma or surgery, lifelong supplementation with eugenol, or levothyroxine sodium, is required.