Overview Safety and Efficacy of Inhaled Treprostinil in Patients With PAH Status: Withdrawn Trial end date: 2016-06-01 Target enrollment: Participant gender: Summary To evaluate the effect of inhaled treprostinil compared to placebo on exercise capacity and time to clinical worsening. Phase: Phase 3 Details Lead Sponsor: United TherapeuticsTreatments: Treprostinil