Manidipine Versus Amlodipine in Patients With Hypertension

The purpose of this study is to evaluate the effect of a third-generation Calcium Channel Blocker (CCB), manidipine, compared with second-generation Calcium Channel Blocker (CCB), amlodipine, on the development of peripheral edema using Direct Segmental Multi-Frequency Bioelectrical Impedance Analysis (DSM-BIA) method in patients with mild to moderate essential hypertension. Investigator expects this study could show more objective evidence of better safety of manidipine compared with amlodipine for peripheral edema.