The dosage of amiodarone after radiofrequency ablation in some patients with atrial fibrillation is 200 mg three times a day, with the dose decreasing weekly and finally maintained at 200 mg once a day. Patients with atrial fibrillation need oral amiodarone to prevent recurrence of atrial fibrillation after radiofrequency ablation, the initial dose of 200mg three times a day orally, adjusted to 200mg twice a day after one week, and then adjusted to 200mg once a day in the third week, and maintained oral for three months. Amiodarone is a western prescription drug, mainly used for the treatment of tachyarrhythmia, the adverse effects of the drug are nausea, vomiting, bradycardia, headache, dizziness, back pain, etc. Allergy to the components of the drug, no pacemaker protection of the sinus node syndrome, pregnant lactating women, patients with thyroid dysfunction is prohibited. In the course of taking the drug, it is necessary to regularly review the electrocardiogram, monitor the QT interval, regularly review liver function, electrolytes, etc., and adjust the dose of the drug under the guidance of the physician.