: an antimalarial drug C18H26ClN3 administered in the form of its bitter crystalline diphosphate

Examples of chloroquine in a Sentence

Recent Examples on the Web
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There are the anti-seizure medications carbamazepine, lamotrigine and phenytoin and the anti-malarial medications chloroquine and amodiaquine. — Bruce Y. Lee, Forbes.com, 15 May 2025 Common antimalarial drugs that cause tinnitus include quinine, hydroxychloroquine, and chloroquine. — Ayesha Gulzar, Verywell Health, 13 Dec. 2024 But like other pathogens, the CDC says certain strains are becoming resistant to the first line of defense drugs – chloroquine – and other common antimalarial drugs. — Adrianna Rodriguez, USA TODAY, 19 July 2023 Treatment includes taking antimalarial drugs such as chloroquine or atovaquone and proguanil, depending on where the infection was thought to have originated. — Time, 27 June 2023 See All Example Sentences for chloroquine

Word History

Etymology

chlor- + quinoline

First Known Use

1946, in the meaning defined above

Time Traveler
The first known use of chloroquine was in 1946

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Cite this Entry

“Chloroquine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/chloroquine. Accessed 2 Oct. 2026.

Medical Definition

: an antimalarial drug administered in the form of its diphosphate C18H26ClN3·2H3PO4 or hydrochloride C18H26ClN3·HCl

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