Betacap TR 20 Capsule contains Metoprolol, a beta-blocker used primarily to manage hypertension (high blood pressure) and angina (chest pain). It is also used to treat heart failure and to prevent heart attacks. Metoprolol works by blocking beta-adrenergic receptors in the heart, which slows down the heart rate and reduces the workload on the heart, thereby lowering blood pressure and reducing the frequency of angina episodes. The "TR" (Timed Release) formulation ensures a gradual release of the medication, providing sustained therapeutic effects and reducing the need for multiple doses throughout the day. Common side effects may include dizziness, fatigue, slow heart rate, and gastrointestinal disturbances.