Word.ws English Dictionary

methylnaltrexone

methylnaltrexone noun: 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.

Noun

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.
    • 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.2008 January 26, Bloomberg News, “Wyeth Says It May Cut 10% of Jobs”, in New York Times

Origin of methylnaltrexone

From methyl + naltrexone.

Questions about methylnaltrexone

What does methylnaltrexone mean?
Methylnaltrexone means 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.
What part of speech is methylnaltrexone?
Methylnaltrexone is a noun.

Words near methylnaltrexone in the dictionary

  1. methylmercury
  2. methylmethacrylate
  3. methylmethaqualone
  4. methylmorphine
  5. methylmorphines
  6. methylnaltrexone
  7. methylnaphthalene
  8. methylnaphthalenes
  9. methylnitronitrosoguanidine
  10. methylnorhomosekikaic acid
  11. methyloclastic

Source and license

Adapted from Wiktionary: methylnaltrexone (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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