Thyroid medications include antithyroid drugs and thyroxine, which treat hyperthyroidism and hypothyroidism, respectively, and patients should prepare for pregnancy under the guidance of a doctor. If hyperthyroid patients take anti-thyroid drugs may have some teratogenic effects on the fetus. Common antithyroid drugs (ATDs) include propylthiouracil, methimazole, carbimazole, etc. ATDs are the basic treatment for hyperthyroidism, and it is recommended to take propylthiouracil in the early stages of pregnancy for hyperthyroidism, which has little effect on the fetus. Patients with hypothyroidism should prepare for pregnancy while taking thyroid hormones to maintain normal thyroid function. Patients with thyroid disease should be treated and prepared for pregnancy under the guidance of a doctor.