After taking thyroxine tablets after thyroid cancer surgery, it is important to pay attention to the adjustment of the medication. Generally, the doctor will give an initial dose of medication according to the patient’s weight and height, and when the patient takes the medication for a month to a month and a half, he/she needs to go to the hospital to review the thyroid function, and then judge whether this dose is appropriate according to the result of the function test, and then increase or decrease the dose of medication.