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methylnaltrexone A methyl derivative of noroxymorphone with selective, opioid-receptor antagonistic activity. Methylnaltrexone displaces opioids from peripheral opioid receptors in the gastrointestinal tract, the bladder, and the skin, resulting in decreases in opioid-related constipation, urinary retention, and pruritis, respectively. Methylnaltrexone does not cross the blood-brain barrier and does not affect the centrally-mediated analgesic effect of opioids. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)
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Synonym: | ![](https://webarchive.library.unt.edu/eot2008/20081025002304im_/http://www.cancer.gov/images/spacer.gif) | N-methylnaltrexone bromide | | ![](https://webarchive.library.unt.edu/eot2008/20081025002304im_/http://www.cancer.gov/images/spacer.gif) | Abbreviation: | ![](https://webarchive.library.unt.edu/eot2008/20081025002304im_/http://www.cancer.gov/images/spacer.gif) | MNTX | | ![](https://webarchive.library.unt.edu/eot2008/20081025002304im_/http://www.cancer.gov/images/spacer.gif) | Chemical structure name: | ![](https://webarchive.library.unt.edu/eot2008/20081025002304im_/http://www.cancer.gov/images/spacer.gif) | 17-(Cyclopropylmethyl)-4,5alpha-epoxy-3,14-dihydroxy-17-methyl-6-oxomorphinanium | | ![](https://webarchive.library.unt.edu/eot2008/20081025002304im_/http://www.cancer.gov/images/spacer.gif) |
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