Methylnaltrexone

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 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. uncountable

    "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."

Example

More examples

"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."

Etymology

From methyl + naltrexone.

Related phrases

side effect

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.