met·​ro·​ni·​da·​zole ˌme-trə-ˈnī-də-ˌzōl How to pronounce metronidazole (audio)
: a drug C6H9N3O3 used especially to treat vaginal trichomoniasis, amebiasis, and infections by anaerobic bacteria

Examples of metronidazole in a Sentence

Recent Examples on the Web Kondo thinks metronidazole, also called MZ, could be an attractive tool. Isabella Cueto, STAT, 14 June 2023 That work then led to a small, ongoing clinical trial at the University of Louisville studying the effect of metronidazole for post-operative pain after endometriosis surgery. Isabella Cueto, STAT, 14 June 2023 Then again, Demodex can survive high concentrations of metronidazole, so maybe the mites are irrelevant to the substance’s actions. Ed Yong, Discover Magazine, 31 Aug. 2012 One of the primary medications recommended by the CDC for treating B. coli is metronidazole, but Harriet didn’t get it until five days after her diagnosis, the records show. Greg Kahn, National Geographic, 8 July 2020 The antibiotics facing export limits are tinidazole, metronidazole, chloramphenicol, erythromycin salts, neomycin, clindamycin salts and ornidazole. Vindu Goel, New York Times, 10 Mar. 2020 Similar export restrictions have been placed on the common antibiotic metronidazole, various versions of vitamin B and eight other medicinal chemicals, according to a notice from the Indian government Tuesday. Dria Roland, Fortune, 3 Mar. 2020 All three come in topical form, and metronidazole and clindamycin, which are antibiotics, are also available as oral medications (though the oral forms of these medications are not recommended during pregnancy). Jessica Grose, New York Times, 30 July 2019 But there are a few medications that have no data indicating adverse effects, Dr. Baldwin said, including metronidazole, clindamycin and azelaic acid. Jessica Grose, New York Times, 30 July 2019 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'metronidazole.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


methyl + -tron- (probably alteration of nitro-) + imide + azole

First Known Use

1960, in the meaning defined above

Time Traveler
The first known use of metronidazole was in 1960

Dictionary Entries Near metronidazole

Cite this Entry

“Metronidazole.” Dictionary, Merriam-Webster, Accessed 10 Dec. 2023.

Medical Definition


met·​ro·​ni·​da·​zole ˌme-trə-ˈnīd-ə-ˌzōl How to pronounce metronidazole (audio)
: an antiprotozoal and antibacterial drug C6H9N3O3 used especially to treat vaginal trichomoniasis, amebiasis, and infections by anaerobic bacteria see flagyl

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