Efficacy and Safety of Aliskiren 300mg Compared to Irbesartan 300mg and Ramipril 10 mg in the Setting of a Missed Dose for Patients With Essential Hypertension.

Inclusion Criteria: * Outpatients 18 years of age and older. * Patients must meet following blood pressure criteria: At Visit 2 : Office Mean Sitting Diastolic Blood Pressure ≥ 90 mmHg and \< 110 mmHg At Visit 3 : Office Mean Sitting Diastolic Blood Pressure ≥ 95 mmHg and \< 110 mmHg before application of Ambulatory Blood Pressure Measurement device At Visit 3 : 24-hr Mean Ambulatory Diastolic Blood Pressure ≥ 85 mmHg * Patient must have an absolute difference of ≤ 10 mmHg in their office Mean Sitting Diastolic Blood Pressure between Visit 2 and 3. * Male or female patients are eligible. Female patients must be either post-menopausal for at least one year, surgically sterile or using effective contraceptive methods such as oral contraceptives, barrier method with spermicide or an intrauterine device. Reliable contraception should be maintained throughout the study and for 7 days after study drug discontinuation. * Patients who are eligible and able to participate in the study, and who consent to do so after the purpose and nature of the investigation has been clearly explained to them (written informed consent). Exclusion Criteria: * Severe hypertension \[Office Mean Sitting Diastolic Blood Pressure ≥ 110 mmHg and/or office mean sitting systolic blood pressure (MSSBP) ≥ 180 mmHg\]. * Current diagnosis of heart failure (NYHA Class II-IV). * History of myocardial infarction, coronary bypass surgery, or any percutaneous coronary intervention (PCI) during the 12 months prior to Visit 1. * Known or suspected contraindications to the study medications, including history of allergy to ACE-Inhibitors or ARBs. * Upper arm circumference \> 42 cm. * Third shift or night workers. Other protocol-defined inclusion/exclusion criteria may apply