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A: Atenolol (Tenormin) belongs to the group of drugs called beta blockers. Atenolol works by reducing heart rate and blood pressure. It is used in patients with high blood pressure (hypertension) or chest pain (angina) and to treat or prevent heart attacks.tenolol, sold under the brand name Tenormin, is a prescription drug used to treat high blood pressure. It is also used to treat angina and chest pain, and has been shown to improve survival rates after a heart attack by decreasing the severity of the heart attack.
Atenolol is part of a class of drugs called beta-adrenergic blocking agents (or beta blockers for short). As the name implies, beta blockers work by blocking beta receptors in the body.Beta receptors are located in a number of places within the body, including the heart and blood vessels.tenolol helps to block a specific type of beta receptor called beta-1 receptors. By blocking beta-1 receptors, the medication causes the reverse effect of adrenaline. It decreases heart rate, systolic and diastolic blood pressure, and the workload of the heart.