Lercanidipine hydrochloride hemihydrate is primarily used as a calcium channel blocker in the treatment of hypertension. It works by relaxing the blood vessels, which helps to lower blood pressure and improve blood flow. This makes it effective in managing high blood pressure, reducing the risk of heart attacks, strokes, and kidney problems. It is often prescribed for patients who require long-term blood pressure control. The medication is typically taken orally, and its slow-release formulation ensures a prolonged effect, minimizing side effects like rapid heart rate or flushing. It is often used as part of a comprehensive treatment plan that includes lifestyle changes such as diet and exercise.