Metoprolol Tablet belongs to a group of medicines called beta-blockers. It is used to treat high blood pressure (hypertension), angina (heart-related chest pain), irregular heart rhythms (arrhythmia). It also helps to prevent future heart attacks and stroke and to prevent migraines.The main side effects of this medicine are sudden lowering of blood pressure, slow heart rate, headache, feeling dizzy, and nausea