cephalexin

noun

ceph·​a·​lex·​in ˌse-fə-ˈlek-sən How to pronounce cephalexin (audio)
: a semisynthetic cephalosporin C16H17N3O4S with a spectrum of antibiotic activity similar to the penicillins

Examples of cephalexin in a Sentence

Recent Examples on the Web
These examples are automatically compiled from online sources to illustrate current usage. Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
According to Bourgeois, amoxicillin, amoxicillin/clavulanate, and cephalexin are all especially susceptible.4 Nitroglycerin tablets and sprays: Heat can break down nitroglycerin, lowering its potency. Rachel Murphy, Verywell Health, 15 July 2024 Other choices, like nitrofurantoin, trimethoprim/sulfamethoxazole, or cephalexin, have more effectiveness with less risk of toxicity. Dr. Keith Roach, oregonlive, 13 Mar. 2023 The most common organism responsible for perichondritis is a bug called Pseudomonas aeruginosa, a virulent pathogen with the ability to resist many antibiotics, including the cephalexin prescribed by Jessica’s pediatrician. Rick Pescatore, Philly.com, 20 Oct. 2017 Jessica’s pediatrician diagnosed a mild case of a bacterial skin infection known as cellulitis, and gave her a prescription for an antibiotic, cephalexin, along with the standard precautions. Rick Pescatore, Philly.com, 20 Oct. 2017

Word History

Etymology

cephalosporin + -ex- (of unknown origin) + -in entry 1

First Known Use

1967, in the meaning defined above

Time Traveler
The first known use of cephalexin was in 1967

Dictionary Entries Near cephalexin

Cite this Entry

“Cephalexin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cephalexin. Accessed 15 Nov. 2024.

Medical Definition

cephalexin

noun
ceph·​a·​lex·​in ˌsef-ə-ˈlek-sən How to pronounce cephalexin (audio)
: a semisynthetic cephalosporin C16H17N3O4S with a spectrum of antibiotic activity similar to the penicillins that is often administered in the form of its hydrochloride C16H17N3O4S·HCl or monohydrate C16H17N3O4S·H2O

Note: Cephalexin is marketed under the trademark Keflex.

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