Overview Optimisation of Hydromorphone - Naloxone Ratio for the Treatment of Pain Status: Completed Trial end date: 2012-01-01 Target enrollment: Participant gender: Summary The purpose of this study is to establish an optimal hydromorphone - naloxone ratio with an improved bowel function for constipated pain patients. Phase: Phase 2/Phase 3 Details Lead Sponsor: Mundipharma Research GmbH & Co KGTreatments: HydromorphoneNaloxone