Atenolol is a beta blocker medication primarily used to treat high blood pressure and heart-associated chest pain. [6]. Atenolol is a beta-blocker that affects the heart and circulation (blood flow through arteries and veins). Atenolol is used to treat angina (chest pain) and hypertension (high blood pressure). Atenolol is also used to lower the risk of death after a heart attack. Atenolol is used alone or together with other medicines to treat high blood pressure (hypertension). High blood pressure adds to the workload of the heart and arteries. If it continues for a long time, the heart and arteries may not function properly. Atenolol is used to treat high blood pressure, angina (chest pain) and improve survival after a heart attack. Atenolol is in a class of medications called beta blockers. Atenolol (Tenormin) is a medication that treats high blood pressure. It can also prevent chest pain and further damage after a heart attack. Learn about atenolol (Tenormin) usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. Atenolol is a medication that may be used to treat certain heart conditions. Atenolol works by blocking the effects of epinephrine on beta-1 receptors within the heart tissue, causing the heart to pump more slowly and with less force. NHS information about the medicine atenolol, including what it's used for, who can take it, how to take it and side effects. Overview: Atenolol is a beta-blocker medicine. It is used to treat high blood pressure, chest pain, and certain heart problems. It works by slowing your heart rate and making your heart beat with. Atenolol is a prescription drug used to treat high blood pressure. Learn about side effects, drug interactions, dosages, warnings, and more.