Ecastolol is primarily used in the field of cardiovascular medicine due to its beta-blocking properties. It is effective in managing hypertension by reducing heart rate and blood pressure, thus decreasing the workload on the heart. Additionally, it is utilized in the treatment of certain types of arrhythmias, helping to stabilize irregular heartbeats. Its ability to block adrenaline effects makes it beneficial in preventing angina episodes by improving blood flow to the heart. Ecastolol is also being researched for its potential use in reducing anxiety symptoms, as it can mitigate the physical effects of stress on the body.