phentermine

noun

phen·​ter·​mine ˈfen-tər-ˌmēn How to pronounce phentermine (audio)
: an anorectic drug C10H15N used in the form of its hydrochloride to treat obesity

Examples of phentermine in a Sentence

Recent Examples on the Web
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The drugs were often used in combination with another appetite suppressant called phentermine, which remains on the market but is prescribed only for short-term use, typically less than 12 weeks, due to its own adverse side effects, including addiction. Scott Lafee, San Diego Union-Tribune, 16 Sep. 2025 However, the task force did examine studies involving the medications liraglutide, semaglutide, orlistat, phentermine and topiramate (sold under brand names such as Saxenda, Wegovy, Alli, Lomaira and Topamax, respectively). Jen Christensen, CNN, 18 June 2024 In 2012, a combination medication of phentermine and topiramate was approved for adult use by the FDA under the name Qysmia. Stephen C. George, Discover Magazine, 30 Apr. 2024 Qsymia combines both phentermine and topiramate in a single pill and at lower doses than either drug used alone. David Snyder, Verywell Health, 30 Mar. 2024 See All Example Sentences for phentermine

Word History

Etymology

probably from phenyl + tert- (from tertiary) + amine

First Known Use

1961, in the meaning defined above

Time Traveler
The first known use of phentermine was in 1961

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Cite this Entry

“Phentermine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/phentermine. Accessed 6 Jul. 2026.

Medical Definition

phentermine

noun
phen·​ter·​mine ˈfen-tər-ˌmēn How to pronounce phentermine (audio)
: an anorectic drug administered in the form of its hydrochloride C10H15N·HCl to treat obesity
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