Overview The Efficacy and Safety of Sildenafil Citrate Used in Combination With Intravenous Epoprostenol in PAH Status: Completed Trial end date: 2006-01-01 Target enrollment: Participant gender: Summary Determination of the effects of sildenafil citrate and epoprostenol when used in combination in patients with pulmonary arterial hypertension Phase: Phase 3 Details Lead Sponsor: PfizerPfizer's Upjohn has merged with Mylan to form Viatris Inc.Collaborator: PfizerTreatments: Citric AcidSildenafil Citrate