Overview Essential Hypertension Status: Completed Trial end date: 2012-02-01 Target enrollment: Participant gender: Summary The purpose of this study is to demonstrate the antihypertensive efficacy of once daily oral administration of ACT 280778 on DBP compared to placebo after 28 days. Phase: Phase 2 Details Lead Sponsor: ActelionIdorsia Pharmaceuticals Ltd.Treatments: Amlodipine