The combination of Telmisartan 80 mg and Cilnidipine 10 mg is primarily used for the management of moderate to severe hypertension (high blood pressure). Telmisartan works by blocking angiotensin II receptors, leading to vasodilation and reduced blood pressure. Cilnidipine blocks calcium channels in vascular smooth muscle and sympathetic nerve endings, helping to reduce peripheral vascular resistance and control heart rate response.