Atenolol is a beta blocker medication primarily used to treat high blood pressure and heart-associated chest pain. [6]. Learn about the side effects of atenolol, from common to rare, for consumers and healthcare professionals. 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 (Tenormin) is a medication that treats high blood pressure. It can also prevent chest pain and further damage 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 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 (Tenormin) is a beta blocker that can treat certain heart conditions, such as chest pain, and high blood pressure. It can also lower the risk of death after a heart attack. Atenolol is a prescription drug used to treat high blood pressure. Learn about side effects, drug interactions, dosages, warnings, and more. Atenolol is a beta-blocker medication used to treat high blood pressure (hypertension), chest pain (angina pectoris) related to coronary artery disease, abnormally rapid heart rates (tachycardias), and to prevent migraine headaches. 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.