Overview Study To Investigate Safety And Efficacy Of Sildenafil In The Newborns With Persistent Pulmonary Hypertension (PPHN) Status: Terminated Trial end date: 2011-11-01 Target enrollment: Participant gender: Summary Sildenafil is efficacious in newborns with persistent pulmonary hypertension and its use will reduce the need for inhaled nitric oxide. Phase: Phase 2 Details Lead Sponsor: PfizerPfizer's Upjohn has merged with Mylan to form Viatris Inc.Treatments: Sildenafil Citrate