Barnidipine HCl is primarily used in the treatment of hypertension, helping to lower high blood pressure by relaxing blood vessels. This allows blood to flow more easily, reducing the strain on the cardiovascular system. It is often prescribed for patients who require long-term management of hypertension to prevent complications such as heart attacks or strokes. Additionally, it may be used in certain cases to manage angina, improving blood supply to the heart muscle and reducing chest pain. Its effectiveness in controlling blood pressure makes it a valuable option in cardiovascular therapy.