The side effects of amiodarone one tablet a day are related to the individual differences of patients, disease state, course of treatment and so on, and cannot be generalized. The common specification of amiodarone tablets is 0.2g, whether one tablet a day will produce side effects is related to the patient’s own tolerance, the severity of the disease, the course of treatment and other factors. Commonly, there are corneal pigmentation, photoallergic reactions, skin lavender or blue-gray, abnormal thyroid hormone levels, pneumonia and other adverse reactions. Amiodarone can inhibit a variety of potassium ion channels, prolong the action potential time course and the effective duration of the shoulder interval, prolong the Q-T interval, used in patients with cardiac arrhythmia. Note hyperthyroidism, allergy to iodine and amiodarone patients are prohibited. Special populations: it is contraindicated in the first and second trimesters of pregnancy and in lactating women. This drug contains high iodine content, long-term application should be regularly checked thyroid function, patients need to be under the guidance of a specialized physician to strictly comply with the doctor’s instructions for the use of drugs.