Diltiazem is primarily used in the treatment of hypertension (high blood pressure) and angina (chest pain). It works by relaxing the blood vessels, which helps to lower blood pressure and improve blood flow to the heart. This makes it effective in reducing the frequency and severity of angina attacks. Additionally, it is sometimes prescribed to manage certain types of irregular heartbeats (arrhythmias) by slowing down the heart rate and improving the heart's efficiency. Diltiazem is often included in long-term management plans for cardiovascular health, helping patients maintain stable blood pressure and reduce the risk of heart-related complications. It is available in various forms, including tablets and extended-release capsules, to suit different treatment needs.