Atenolol is a prescription drug used to treat high blood pressure. Learn about side effects, drug interactions, dosages, warnings, and more. Atenolol Atenolol is a medicine used to treat high blood pressure, chest pain (angina), and heart rhythm problems. It's only available with a prescription. Atenolol (Tenormin) is a cardioselective beta-blocker that's used to treat high blood pressure and chest pain. It's also used to lower the risk of death after a heart attack. Atenolol (Tenormin) works by slowing down heart rate and making it easier for your heart to pump blood. Atenolol (Tenormin) is taken by mouth, typically once daily. Some common side effects of this medication include. Learn about the side effects of atenolol, from common to rare, for consumers and healthcare professionals. Find patient medical information for Atenolol (Tenormin) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Atenolol is a beta blocker medication primarily used to treat high blood pressure and heart-associated chest pain. [6] Although used to treat high blood pressure, it does not seem to improve mortality in those with the condition. [7][8] Other uses include the prevention of migraines and treatment of certain irregular heart beats. [6][9] It is taken orally (by mouth) or by intravenous injection. Atenolol (Tenormin) is a medication that treats high blood pressure. It can also prevent chest pain and further damage after a heart attack. Atenolol may cause heart failure in some patients. Check with your doctor right away if you are having chest pain or discomfort, dilated neck veins, extreme fatigue, irregular breathing or heartbeat, swelling of the face, fingers, feet, or lower legs, trouble breathing, or weight gain. 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. It works by relaxing blood vessels and slowing heart rate to improve blood flow and decrease blood pressure. Atenolol is used to treat angina (chest pain) and hypertension (high blood pressure). Learn about side effects, interactions and indications.