Thyroid hormone medication usually refers to levothyroxine sodium tablets, long-term thyroid hormone medication for mothers with babies able to eat mother’s breast milk. Levothyroxine sodium tablets are commonly used in the replacement therapy of hypothyroidism, and adverse effects include palpitations, angina, headache, vomiting, menstrual disorders, tremors insomnia, excessive sweating, weight loss and diarrhea. Contraindications include untreated adrenal insufficiency, pituitary insufficiency and thyrotoxicosis, acute myocardial infarction, acute myocarditis, and hypersensitivity to the product. Studies have shown that the amount of thyroid hormone secreted into breast milk during lactation is not sufficient to cause hyperthyroidism or suppressed TSH secretion in infants when treated with levothyroxine sodium tablets during lactation. Therefore, mothers who have been taking levothyroxine hormone for a long time can also breastfeed. In addition, Levothyroxine Sodium Tablets should be taken under medical supervision and should not be taken on your own.