ESMOLOL 100mg Injection belongs to a group of medicine called long-acting beta-blocker. It works by blocking the effects of some chemicals on your heart and blood vessels. It slows down your heart rate and helps the heart beat with less force. This lowers your blood pressure and helps in reducing your risk of having a stroke, a heart attack, other heart problems, or kidney problems in the future. It is given as an injection under the supervision of your doctor.