Overview Placebo Controlled Trial of Bosentan in Scleroderma Patients Status: Terminated Trial end date: 2010-03-01 Target enrollment: Participant gender: Summary The purpose of this study is to determine whether the drug Bosentan improves exercise tolerance in scleroderma patients. Phase: Phase 2 Details Lead Sponsor: Georgetown UniversityCollaborator: ActelionTreatments: Bosentan