sul·​fa·​meth·​ox·​a·​zole | \ ˌsəl-fə-ˌme-ˈthäk-sə-ˌzōl How to pronounce sulfamethoxazole (audio) \

Definition of sulfamethoxazole

: an antibacterial sulfonamide C10H11N3O3S used alone or in combination with trimethoprim (as in the treatment of urinary tract infections or acute otitis media)

Examples of sulfamethoxazole in a Sentence

Recent Examples on the Web Next came Macrobid, a combination treatment of trimethoprim and sulfamethoxazole. Natalie Ma, STAT, 31 Oct. 2021 Antibiotics are used to treat donovanosis, including azithromycin, doxycycline, ciprofloxacin, erythromycin and trimethoprim-sulfamethoxazole. Scott Gleeson, USA TODAY, 26 Oct. 2021 Laboratory testing found that 20 of these cases were resistant to common antibiotics such as chloramphenicol, streptomycin, sulfamethoxazole and tetracycline. Sandee Lamotte, CNN, 25 Aug. 2021 My pulmonary doctor didn’t tell me much except to put me on sulfamethoxazole drugs. Dr. Keith Roach, oregonlive, 1 July 2021 Treatment of nocardia of the lung in people with normal immune systems usually involves trimethoprim and sulfamethoxazole; since that seemed not to do well for you, minocycline is a reasonable option. Dr. Keith Roach, oregonlive, 1 July 2021 Seeing a doctor is important not only because the infection can be diagnosed by stool exams, but also because the parasite is treatable with trimethoprim-sulfamethoxazole, an antibiotic combination, according to Dr. Sears. Colleen Murphy,, 29 June 2021 The usual treatment is trimethoprim/sulfamethoxazole, an antibiotic combination. Sarah Jacoby, SELF, 9 July 2018 Trimethoprim-sulfamethoxazole is a combination of two antibiotics that is used to treat a wider variety of illnesses, including ear infections and bronchitis in addition to UTIs. Korin Miller, SELF, 18 Jan. 2018 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'sulfamethoxazole.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of sulfamethoxazole

1960, in the meaning defined above

History and Etymology for sulfamethoxazole

sulfa + methyl + oxazole, a compound C3H3NO (from International Scientific Vocabulary ox- + azole)

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Time Traveler for sulfamethoxazole

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The first known use of sulfamethoxazole was in 1960

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Dictionary Entries Near sulfamethoxazole

sulfa drug



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Cite this Entry

“Sulfamethoxazole.” Dictionary, Merriam-Webster, Accessed 8 Aug. 2022.

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More Definitions for sulfamethoxazole


variants: or chiefly British sulphamethoxazole \ -​ˌmeth-​ˈäk-​sə-​ˌzōl How to pronounce sulfamethoxazole (audio) \

Medical Definition of sulfamethoxazole

: an antibacterial sulfonamide C10H11N3O3S used alone (as in the treatment of urinary tract infections or prophylaxis against meningococcal meningitis) or in combination with trimethoprim (as in the treatment of Pneumocystis carinii pneumonia, shigellosis, acute otitis media, or urinary tract infections) — see bactrim, septra


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