Atenolol is an antihypertensive agent belonging to the beta-blocker class.It is approved for treating hypertension, angina pectoris due to coronary atherosclerosis, and acute myocardial infarction. Atenolol is a hydrophilic beta-receptor blocker mostly excreted by the kidneys; the liver is only involved in the metabolism of roughly 5% of the drug. About 50% of the beta-blocker is finally bioavailable after oral treatment since Atenolol is only partially absorbed from the colon. Only 3% of ... Atenolol is a second-generation β-1–selective adrenergic antagonist that helps lower the heart rate and blood pressure of patients while also decreasing myocardial contractility. Atenolol is approved by the U.S. Food and Drug Administration (FDA) for treating hypertension, angina pectoris, and acute myocardial infarction. Off-label uses of atenolol include the treatment of arrhythmias, migraine prophylaxis, paroxysmal supraventricular tachycardia, alcohol withdrawal, thyrotoxicosis, and ... Atenolol is a beta blocker that treats angina, arrhythmia, heart attack and hypertension. Learn how it works, what are its common side effects and available medicines on 1mg.com. Atenolol 50mg Tablet belongs to a group of medicines called beta-blockers. It is used to treat high blood pressure (hypertension), angina (heart-related chest pain), irregular heart rhythms (arrhythmia). It also helps to prevent future heart attacks and stroke. Atenolol 50mg Tablet may be prescribed alone or together with other medications. The dose and frequency depend on what you are taking it for and the severity of your condition. It may be taken empty stomach or with a meal, but take it ...