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methyl +‎ naltrexone


methylnaltrexone (uncountable)

  1. A peripherally-acting μ-opioid antagonist that acts to reverse some of the side effects of opioid drugs such as constipation without affecting analgesia or precipitating withdrawals.
    • 2008 January 26, Bloomberg News, “Wyeth Says It May Cut 10% of Jobs”, in New York Times[1]:
      Since Jan. 1, 2007, the Food and Drug Administration has postponed clearance of Wyeth’s bifeprunox for schizophrenia, Pristiq for depression and menopausal hot flashes, Viviant for bone loss and methylnaltrexone for constipation.