Patients with thyroid hormone synthesis disorders usually need to take levothyroxine sodium tablets, how many levothyroxine sodium tablets to take a day is determined by the doctor, as prescribed. Application of levothyroxine sodium tablets for the treatment of hypothyroidism, chronic lymphoid thyroiditis, suppressive (and replacement) therapy after surgery for thyroid cancer, the dosage is related to the age of the patient, the severity of hypothyroidism and so on. The dose of treatment should be individualized and patients should never use levothyroxine sodium tablets on their own according to the instructions. Adults are usually initially dosed with 25-50 μg per day, with a maximum of no more than 100 μg, which may be increased by 25-50 μg every 2-4 weeks until normal metabolism is maintained. The usual maintenance dose is 50-200 μg/day. As thyroid function normalizes, the metabolic clearance of thyroid hormone will increase, and it is possible that the dose will have to be adjusted. If there is any discomfort, consult your doctor and inform him/her, and follow his/her advice to adjust the dose.