Eugenol is levothyroxine sodium tablets, which can replace thyroid hormone. Pregnant women with hypothyroidism need to be treated, otherwise it will affect the normal development of the fetus and lead to cretinism, which is manifested by pale and thickened skin, short stature, lowered body temperature, and slowed growth and development. Generally, taking Euthyrox can maintain normal thyroid hormone level and have no side effects on the fetus. If you take an excessive amount of Euthyrox, it may lead to hyperthyroidism symptoms and also affect the normal development of the fetus, so you have to adjust the dose of Euthyrox.