Atenolol (Zenobloc 100) 100mg Film Coated Beta Blocking Agent Tablet 100's is a medication primarily used to manage high blood pressure (hypertension), chest pain (angina), and to improve survival after a heart attack. It belongs to the class of drugs known as beta-blockers, which work by blocking the action of certain chemicals (like adrenaline) on the heart and blood vessels. This results in a slower heart rate, lower blood pressure, and reduced strain on the heart. It may also be prescribed to prevent migraine headaches and treat other heart-related conditions. Always follow the prescribed dosage and seek guidance from a healthcare professional for any concerns.