Eugenol (Levothyroxine Sodium Tablet) is mainly used for patients with hypothyroidism combined with pregnancy. Pregnant women need to be treated by supplementing the physiological requirement of thyroid hormone, and the aim of the treatment is to control the tsh (thyroid-stimulating hormone) to be within 2.5 mmol per liter. The usage of levothyroxine sodium for pregnant women should be determined according to the thyroid function, and the usage of pregnant hypothyroid patients is more strictly controlled, half a tablet is recommended at the beginning of the treatment, once a day, and the thyroid function should be reviewed after one week, if the tsh is still increased, it is necessary to take one tablet a day and dynamically monitor, and the weekly review should be done to reduce the tsh to within 2.5 mmol per liter, to maintain a stable level, and dynamically monitor. Pregnant women with hypothyroidism must take levothyroxine sodium under the guidance of a doctor, and regular review, the dosage of levothyroxine sodium can be adjusted according to the situation.