Atenolol 25/50/100mg is a beta-blocker used primarily to treat high blood pressure (hypertension), chest pain (angina), and to improve survival after a heart attack. It works by blocking the effects of adrenaline (epinephrine) on the beta receptors in the heart, which results in a slower heart rate, reduced blood pressure, and decreased strain on the heart.

Atenolol is often prescribed for managing cardiovascular conditions, such as hypertension (high blood pressure), angina pectoris (chest pain), and for arrhythmias (irregular heartbeats). It may also be used to prevent migraine headaches in some cases.