Overview EVEREST: Efficacy of Vasopressin Antagonism in hEart failuRE: Outcome Study With Tolvaptan Status: Completed Trial end date: 2006-07-01 Target enrollment: Participant gender: Summary The purpose of this study is to compare the effectiveness of tolvaptan or placebo in adults with worsening congestive heart failure (CHF). Phase: Phase 3 Details Lead Sponsor: Otsuka Pharmaceutical Development & Commercialization, Inc.Treatments: Tolvaptan