title: Methylnaltrexone: new drug. Opiate-induced constipation: barely more effective than placebo.
mesh_terms: D000701:Analgesics, Opioid / Q000009:adverse effects; D002986:Clinical Trials as Topic; D003248:Constipation / Q000139:chemically induced / Q000188:drug therapy*; D004311:Double-Blind Method; D017277:Drug Approval; D005060:Europe; D006801:Humans; D009271:Naltrexone / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000627:therapeutic use*; D009292:Narcotic Antagonists / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D000644:Quaternary Ammonium Compounds / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D019452:Terminally Ill
chemical_list: D000701:Analgesics, Opioid; D009292:Narcotic Antagonists; D000644:Quaternary Ammonium Compounds; C032257:methylnaltrexone; D009271:Naltrexone