Overview Study of Methylnaltrexone (MNTX) for the Relief of Constipation Status: Completed Trial end date: 2005-10-01 Target enrollment: Participant gender: Summary To determine the efficacy of subcutaneous MNTX to relieve opioid-induced constipation in patients with advanced medical illness. Phase: Phase 3 Details Lead Sponsor: Bausch Health Americas, Inc.Valeant Pharmaceuticals International, Inc.Collaborator: Wyeth is now a wholly owned subsidiary of PfizerTreatments: MethylnaltrexoneNaltrexone