naltrexone

noun

nal·​trex·​one nal-ˈtrek-ˌsōn How to pronounce naltrexone (audio)
: a synthetic opiate antagonist C20H23NO4 administered in the form of its hydrochloride

Examples of naltrexone in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Everyone has the right to their own solution The truth is that there is no silver bullet — neither AA nor naltrexone nor anything else. Jonathan Hunt-Glassman, Fortune, 21 Sep. 2025 Medications may include antidepressants, commonly selective serotonin reuptake inhibitors (SSRIs), and the opioid antagonist naltrexone. Wendy Wisner, Health, 9 July 2025 These medications include methadone, buprenorphine and extended-release naltrexone. Katherine Lemasters, The Conversation, 13 June 2025 For example, naltrexone, a medication used to reduce cravings and relapse in alcohol and opioid use disorders, is mostly effective for those with a specific genetic variant that is rare among individuals of African descent, and more common in those with European ancestry. Samantha N. Melendez, Denver Post, 5 June 2025 See All Example Sentences for naltrexone

Word History

Etymology

N-allyl + trex- (as in methotrexate) + -one

First Known Use

1973, in the meaning defined above

Time Traveler
The first known use of naltrexone was in 1973

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Cite this Entry

“Naltrexone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/naltrexone. Accessed 4 Oct. 2025.

Medical Definition

naltrexone

noun
nal·​trex·​one nal-ˈtrek-ˌsōn How to pronounce naltrexone (audio)
: a synthetic opiate antagonist administered especially in the form of its hydrochloride C20H23NO4·HCl to maintain a drug-free state in detoxified opiate-dependent patients or to maintain abstinence in alcohol-dependent patients

More from Merriam-Webster on naltrexone

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