A Long Term Safety Study to Test the Combination of Aliskiren/ Amlodipine / Hydrochlorothiazide in Participants With Essential Hypertension

Inclusion Criteria: * Outpatients 18 years of age or older * Male or female participants are eligible. * Mean sitting diastolic blood pressure (msDBP) and mean sitting systolic blood pressure (msSBP) Requirements: * For newly diagnosed/untreated participants, msDBP ≥ 100 and \< 120 millimeters of mercury (mmHg), and/or msSBP ≥ 160 and \< 200 mmHg at Visit 1 and Visit 2. * For previously treated participants, msDBP ≥ 100 and \< 120 mmHg, and/or msSBP ≥ 160 and \< 200 mmHg at Visit 2, Visit 3, or Visit 4. * For participants requiring tapering off their previous antihypertensive medication, they must meet the above criteria and completely discontinue all antihypertensive treatment prior to entering the treatment phase of the study. * Participants 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: * Inability to discontinue all prior antihypertensive medications safely for a period of 1 week to 4 weeks as required by the protocol. * Participants on three antihypertensive drugs with msDBP ≥ 110 mmHg and/or msSBP ≥ 180 mmHg at Visit 1. * Participants on four or more antihypertensive drugs at Visit 1. * Participants with an msSBP ≥ 200 and msDBP ≥ 120 mmHg anytime during the washout period of the study Visit 1-4 must be discontinued from the study. * Pregnant or nursing (lactating) women, where pregnancy is defined as the state of a female after conception and until the termination of gestation, confirmed by a positive human chorionic gonadotropin (hCG) laboratory test (\>= 5 milli-international units per milliliter mIU/mL).