Overview Efficacy and Safety of HPN-100 for the Treatment of Adults With Urea Cycle Disorders Status: Completed Trial end date: 2010-09-01 Target enrollment: Participant gender: Summary This was a randomized, active-controlled, double-blind, cross-over study designed to enroll subjects with UCDs who are being treated with NaPBA. Phase: Phase 3 Details Lead Sponsor: Horizon Pharma Ireland, Ltd., Dublin IrelandTreatments: 4-phenylbutyric acidGlycerol