Treatment of tachycardia and atrial fibrillation mainly involves the following aspects of drug therapy. First, controlling the heart rate. When the heartbeat is too fast, under the guidance of a doctor, β-blockers such as metoprolol or drugs like digoxin can be administered regularly to control the heartbeat and improve symptoms. Second, anticoagulant therapy. Long-term episodes of atrial fibrillation can cause thrombosis in the left atrium, especially in the left atrial appendage. When the thrombus dislodges, it can cause thrombotic complications, such as a cerebral infarction. In such cases, long-term anticoagulant medication is necessary to prevent thrombosis, using drugs such as rivaroxaban or warfarin. Third, surgical treatment, such as radiofrequency ablation surgery, may potentially cure atrial fibrillation.