SECTRAL (acebutolol hydrochloride) Capsules. DESCRIPTION. Sectral (acebutolol HCl) is a selective, hydrophilic beta-adrenoreceptor blocking agent with mild intrinsic sympathomimetic activity for use in treating patients with hypertension and ventricular arrhythmias. Atenolol (Tenormin) 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 used alone or in combination with other medications to treat high blood pressure. It also is used to prevent angina (chest pain) and improve survival after a heart attack. Find patient medical information for Atenolol Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Learn more about atenolol (Tenormin), including common side effects, drug interactions, description, generic and brand names, drug class and mechanism, preparations, storage, reasons for prescription, dosing, and effect on pregnancy. Atenolol and Chlorthalidone Tablets are for the treatment of hypertension. It combines the antihypertensive activity of two agents: a beta 1-selective (cardioselective) hydrophilic blocking agent (atenolol) and a monosulfonamyl diuretic (chlorthalidone). Atenolol (Tenormin) is used to treat high blood pressure and angina, and to reduce heart attack risk. Learn about its side effects, dosage, uses, and more. Atenolol (free base) has a molecular weight of 266. It is a relatively polar hydrophilic compound with a water solubility of 26.5 mg/mL at 37°C and a log partition coefficient (octanol/water) of 0.23. ATENOLOL is a beta-blocker. Beta-blockers reduce the workload on the heart and help it to beat more regularly. This medicine is used to treat high blood pressure and to prevent chest pain. Atenolol is approved for controlling high blood pressure, relieving symptoms of angina, and improving survival following a heart attack. It works by blocking a specific type of beta receptor, which causes the reverse effect of stress hormones -- decreasing heart rate and systolic and diastolic blood pressure, as well as the workload of the heart.