Metoprolol can treat atrial fibrillation, for the treatment of atrial fibrillation, the drug has three main blocks: the first block is anticoagulation; the second block is to control the ventricular rate; the third block is to convert to sinus rhythm. Metoprolol is mainly used to control the ventricular rate of the drug, when acute atrial fibrillation or chronic atrial fibrillation patients with rapid ventricular rate, control of the ventricular rate is an important measure to alleviate the symptoms and improve cardiac function, the clinical application of the more is the second class of anti-arrhythmic drugs, beta-blockers, which can maintain the ventricular rate of patients with atrial fibrillation, representative of the drug has metoprolol, bisoprolol. This is only one treatment for atrial fibrillation, there are other comprehensive treatments for better control of atrial fibrillation.