Cilinitab CT is a combination of two medicines: Cilnidipine and Chlorthalidone. Cilnidipine is a calcium channel blocker . Cilinitab work by widening and relaxing the blood vessels. Cilinitab is a diuretic which removes extra water and certain electrolytes from the body through urine. Cilinitab also works by relaxing blood vessels and improving blood flow. Cilinitab is also used to treat high blood pressure.