Barnidipine is primarily used in the treatment of hypertension (high blood pressure). It functions as a calcium channel blocker, which helps relax blood vessels, allowing blood to flow more smoothly and reducing the workload on the heart. This action effectively lowers blood pressure and improves overall cardiovascular function. It is commonly prescribed as a long-term management option for patients with essential hypertension. Due to its sustained antihypertensive effect, barnidipine helps reduce the risk of stroke, heart attack, and other complications associated with high blood pressure.