title: An overview of constipation and newer therapies.
authors.forename: Robert E
authors.initials: RE
authors.lastname: Enck
mesh_terms: D000701:Analgesics, Opioid / Q000009:adverse effects*; D003248:Constipation / Q000139:chemically induced* / Q000188:drug therapy*; D004305:Dose-Response Relationship, Drug; D004361:Drug Tolerance; D006801:Humans; D054368:Laxatives / Q000627:therapeutic use; D009020:Morphine / Q000009:adverse effects; D009271:Naltrexone / Q000031:analogs & derivatives / Q000627:therapeutic use; D009292:Narcotic Antagonists / Q000627:therapeutic use*; D009369:Neoplasms / Q000150:complications; D010146:Pain / Q000188:drug therapy* / Q000209:etiology; D010880:Piperidines / Q000627:therapeutic use; D000644:Quaternary Ammonium Compounds / Q000627:therapeutic use
chemical_list: D000701:Analgesics, Opioid; D054368:Laxatives; D009292:Narcotic Antagonists; D010880:Piperidines; D000644:Quaternary Ammonium Compounds; C032257:methylnaltrexone; D009271:Naltrexone; C419502:alvimopan; D009020:Morphine