High blood pressure /bp? Atenolol Atenolol belongs to a group of medicines called beta-blockers. It's used to treat high blood pressure and irregular heartbeats and arrhythmia. It can also be used to prevent chest pain caused by angina. If you have high blood pressure, taking atenolol helps prevent future heart disease, heart attacks, and strokes Atenolol oral tablet is available as a brand-name drug and a generic drug. Brand name isTenormin. Atenolol comes only as a tablet you take by mouth. Atenolol is used to treat high blood pressure and chest pain. It can also help prevent heart attack or heart damage after a heart attack. Formula: C14H22N2O3 Dosing How much you take depends on why you need atenolol. For high blood pressure – the usual dose is 25mg to 50mg taken once a day. For angina (chest pain) – the usual dose is 100mg taken once a day or split into 2 50mg doses. For irregular heartbeats (arrhythmia) - the us...