In this secondary analysis of a dose-titration study of patients with hypertension uncontrolled on prior monotherapy, blacks (n=234) and non-blacks (n=765) were switched to amlodipine (AML)/olmesartan medoxomil (OM) 5/20 mg, with uptitration every 4 weeks to AML/OM 5/40 mg and then AML/OM 10/40 mg to achieve a seated cuff blood pressure (SeBP) of <120/70 mm Hg. Hydrochlorothiazide 12.5 and 25 mg could be added if SeBP was ≥125/75 mm Hg. The cumulative proportions of patients achieving systolic SeBP <140 mm Hg (<130 mm Hg if diabetic) at 12 weeks were 71.6% for blacks and 77.2% for non-blacks. Mean SeBP change from baseline in blacks (mean baseline BP: 153.0/93.7 mm Hg) ranged from −11.7/−6.1 mm Hg for AML/OM 5/20 mg to −23.6/−12.9 mm Hg for AML/OM 10/40 mg +hydrochlorothiazide 25 mg (all P<.0001). Antihypertensive efficacy was maintained throughout the 24-hour dosing interval. An AML/OM-based regimen was effective in blacks with hypertension uncontrolled on prior monotherapy.