Zanidip (Lercanidipine) is an antihypertensive drug. It belongs to the dihydropyridine class of calcium channel blockers, which work by relaxing and opening the blood vessels allowing the blood to circulate more freely around the body. This lowers the blood pressure and allows the heart to work more efficiently. Lercanidipine is a medicine used to treat high blood pressure. If you have high blood pressure, taking lercanidipine helps prevent heart disease, heart attacks and strokes.