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. NHS information about the medicine atenolol, including what it's used for, who can take it, how to take it and side effects. 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 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. View atenolol information, including dose, uses, side-effects, renal impairment, pregnancy, breast feeding, contra-indications and monitoring requirements. Atenolol is a beta blocker medication primarily used to treat high blood pressure and heart-associated chest pain. [6]. 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 (Tenormin) is a medication that treats high blood pressure. It can also prevent chest pain and further damage after a heart attack. Atenolol belongs to a class of drugs known as beta-blockers. It works by blocking the action of certain natural chemicals in your body, such as epinephrine, on the heart and blood vessels. This effect lowers the heart rate, blood pressure, and strain on the heart. 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.