Metoprolol is divided into two categories of four dosage forms, the first category of short-acting formulations are 25mg/tablet and 50mg/tablet, while the long-acting formulations of extended-release tablets are 47.5mg/tablet and 95mg/tablet. Metoprolol can be used for antihypertensive treatment, in which the effect of antihypertensive is very helpful for patients, which can slow down the ventricular rate, control the oxygen consumption of the heart muscle is one of the commonly used antihypertensive drugs. Metoprolol can also be used in coronary artery disease to reduce myocardial oxygen consumption. Metoprolol is a beta-blocker that can also be used in heart failure, one of the three cornerstones of the treatment of heart failure. Metoprolol can also be used to control arrhythmias in atrial and ventricular arrhythmias, but not in slow arrhythmias.