First, after taking the drug 2 hours before eating; Second, outpatients if motion sickness, it is recommended that within 2 hours do not take the car or take motion sickness medication after taking the car; Third, treatment with leukopenia or liver damage and rapid heart rate of patients can continue to take the relevant drugs for symptomatic treatment; Fourth, goiter patients do not often press the thyroid gland; Fifth, within the first month of treatment, pay attention to rest, to avoid fatigue, and to control their personal emotions; Avoid short distance and prolonged contact with infants, young children or pregnant women within two weeks after treatment; 7, female patients should not be pregnant within one year after treatment, and male patients should take contraceptive measures within six months; 8, avoid smoking and alcohol, and avoid iodine-rich foods and spicy stimulating foods until the hyperthyroidism is cured; 9, it is recommended that the thyroid function be rechecked every month for three consecutive months after treatment, to observe the recovery of the condition; 10, three months after treatment Thyroid hormone (T3, T4) levels do not drop significantly or six months after the hyperthyroidism is not completely cured can be the second treatment; xi. Hyperthyroidism cured by 131I, with the prolongation of time will gradually appear hypothyroidism (hypothyroidism), hypothyroidism typical manifestations include: chills, fatigue, hands and feet swelling, joint muscle pain, anorexia, bloating, constipation, weight gain, memory loss, heart rate, slow, etc., after hypothyroidism need to be slow, and so on, after the occurrence of hypothyroidism, the heart rate will be slow. After hypothyroidism occurs, long-term thyroid hormone replacement therapy (eugenol or Ractis) is needed.