Study to Evaluate the Efficacy and Safety of Combination Aliskiren/Amlodipine in Patients With Hypertension Not Adequately Responding to Amlodipine Alone

Inclusion Criteria: * Newly diagnosed patients or patients who have not been treated for hypertension within the 4 weeks prior to Visit 1 must have a msDBP ≥ 95 mmHg and \< 110 mmHg at Visits 1 and 2 * Patients who have been treated for hypertension within the 4 weeks prior to Visit 1 must have a msDBP ≥ 90 mmHg and \< 110 mmHg at Visit 2 * All patients must have a msDBP ≥ 90 mmHg and \< 110 mmHg at Visit 5 (randomization) Exclusion Criteria: * Severe hypertension * Pregnant or nursing (lactating) women * Pre-menopausal women not taking accepted form of birth control * Serum potassium ≥ 5.3 mEq/L (mmol/L) at Visit 1 * History of cardiovascular conditions * Uncontrolled Type 1 or Type 2 diabetes mellitus * Hypersensitivity to renin inhibitors, calcium channel blockers, or to drugs with similar chemical structures Other protocol-defined inclusion/exclusion criteria may apply