The purpose of the present study is to evaluate the effects of amlodipine once daily on 24-hours BP control, hormonal and renal hemodynamic parameters, in patients, in patients with essential hypertension. This study was was an open non-comparative study of amlodipine 5-10 mg once daily, which consisted of two phases : a 2-weeks placebo run-in period and an 8-week active treatment with amloidip…