Overview A Extension Study of Udenafil in Adolescents Status: Active, not recruiting Trial end date: 2020-12-01 Target enrollment: Participant gender: Summary This study is a 12-month (52 week) safety extension study to supplement the FUEL Phase III clinical trial to provide safety information regarding the long-term use of udenafil in adolescents with single ventricle congenital heart disease. Phase: Phase 3 Details Lead Sponsor: Mezzion Pharma Co. LtdCollaborator: National Heart, Lung, and Blood Institute (NHLBI)Treatments: Udenafil