Overview Opioids and Esophageal Function Status: Completed Trial end date: 2010-01-01 Target enrollment: Participant gender: Summary The purpose of this study is to evaluate if opioid-induced effects on the pharynx and esophagus is centrally or peripherally mediated. Phase: Phase 4 Details Lead Sponsor: Region Örebro CountyCollaborator: Wyeth is now a wholly owned subsidiary of PfizerTreatments: Analgesics, OpioidMethylnaltrexoneNaltrexone