: a folic acid antagonist C12H13ClN4 used in the chemoprophylaxis or treatment of malaria and in the treatment of toxoplasmosis

Examples of pyrimethamine in a Sentence

Recent Examples on the Web
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Folate supplements can interact with several medications including methotrexate, sulfasalazine, anti-seizure medications, immunosuppressants, NSAIDs, barbiturates, diuretics, and pyrimethamine (an anti-malarial drug). — Lainey Younkin, Ms, Rd, Verywell Health, 22 Mar. 2024 Perhaps the most infamous example of a clinically effective, decades old generic drug that got transformed into a profit maker due to sky-high price increases is Daraprim (pyrimethamine). — Joshua Cohen, Forbes, 10 Oct. 2022 Several years later, Elion and Hitchings developed the anti-malarial agent pyrimethamine, which is now used primarily to treat a potentially fatal foodborne illness called toxoplasmosis. — Patrick Adams, National Geographic, 31 Aug. 2020 Daraprim, also known as pyrimethamine, is used to treat toxoplasmosis, a parasitic infection that can cause damage to the brain, eyes or other organs in severe cases, the FDA said. — Shelby Lin Erdman and Jamie Gumbrecht, CNN, 29 Feb. 2020 But these alternatives are shut down by the same mutations that make the parasites resistant to pyrimethamine. — Ed Yong, The Atlantic, 11 Dec. 2017

Word History

Etymology

pyrimidine + ethyl + amine

First Known Use

1952, in the meaning defined above

Time Traveler
The first known use of pyrimethamine was in 1952

Browse Nearby Words

Cite this Entry

“Pyrimethamine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pyrimethamine. Accessed 7 Oct. 2026.

Medical Definition

pyrimethamine

noun
: a folate antagonist C12H13ClN4 that is used in the treatment of toxoplasmosis and in the prevention and treatment of malaria

Note: Pyrimethamine is marketed under the trademark Daraprim.

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