Overview Evaluate the Pharmacokinetics and Safety of MK-4448 in Participants With Nonvalvular Atrial Fibrillation or Atrial Flutter Status: Completed Trial end date: 2011-04-01 Target enrollment: Participant gender: Summary The primary purpose of this study is to optimize drug exposure in the target population. Phase: Phase 2 Details Lead Sponsor: Merck Sharp & Dohme Corp.Portola PharmaceuticalsCollaborator: Portola PharmaceuticalsTreatments: AmiodaroneBetrixaban