Cilnidipine 5mg/10mg/20mg is a calcium channel blocker used to treat high blood pressure (hypertension). It works by inhibiting the influx of calcium ions into smooth muscle cells and heart muscle cells, leading to the relaxation and dilation of blood vessels. This helps to lower blood pressure and improve blood flow. Unlike traditional calcium channel blockers, Cilnidipine also has the added benefit of blocking norepinephrine receptors, which helps reduce peripheral vascular resistance, further enhancing its antihypertensive effect. Cilnidipine is often prescribed for the management of hypertension, especially in patients who need effective control of blood pressure with minimal side effects like swelling (edema).