Eugenol is clinically known as levothyroxine sodium tablets, pregnant women with hypothyroidism to achieve the treatment goal, or need to continue oral levothyroxine sodium tablets, and regular review of thyroid function, follow the doctor’s instructions to adjust the drug. The treatment goal of hypothyroidism in pregnancy, TSH control in the lower 1/2 of the pregnancy-specific reference range or below 2.5 mIU/L, even if the thyroid function test is normal, should continue to take oral levothyroxine sodium tablets under the guidance of the doctor. Untreated hypothyroidism in pregnancy can lead to slow development of the fetus, and the fetus’s intellectual development will also be affected, or even develop cretinism, and miscarriage or preterm labor may also occur. Hypothyroidism in pregnancy should be treated under the professional guidance of a doctor and should not be discontinued on its own.