Merol 100mg Tablets are used to treat high blood pressure (hypertension). It contains the active ingredient Metoprolol, which is a beta-blocker medication. Beta-blockers work by blocking the effects of adrenaline on the heart, which slows down the heart rate and reduces the force of the heart's contractions, thus reducing blood pressure. Merol tablets are available in a pack size of 3 x 10 tablets.