Efonidipine hydrochloride monoethanolate 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 and reducing the risk of cardiovascular events such as strokes and heart attacks. Additionally, it is sometimes prescribed for patients with angina, as it helps to alleviate chest pain by improving oxygen supply to the heart muscle. Its unique dual action on both L-type and T-type calcium channels makes it particularly beneficial for patients with certain types of hypertension or those who may not respond well to other calcium channel blockers.