Esmolol is a medication that is commonly used in the treatment of rapid heart rate or other heart conditions. There are several synonyms for esmolol that may arise in medical discussions, including beta-blockers, beta-adrenergic blocking agents, and cardioselective beta-blockers. Beta-blockers are a class of medications that work by blocking the effects of adrenaline and other stress hormones on the heart. Other synonyms for esmolol may include metoprolol, atenolol, and propranolol, which are all other medications in the same class. These medications are all commonly used to treat hypertension, heart failure, and other cardiac conditions, and may be prescribed by a doctor to help manage symptoms and improve patient outcomes.