chlo·​ro·​quine ˈklȯr-ə-ˌkwēn How to pronounce chloroquine (audio)
: an antimalarial drug C18H26ClN3 administered in the form of its bitter crystalline diphosphate

Examples of chloroquine in a Sentence

Recent Examples on the Web Others have died after ingesting other unproven COVID-19 cures such as chloroquine phosphate and hydroxychloroquine, which was promoted by Trump as president. David Klepper, Fortune Well, 31 Jan. 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 Hydroxychloroquine and its cousin chloroquine had also been studied as antivirals with activity against the similar SARS coronavirus and other viruses. Joel Zinberg, WSJ, 14 Dec. 2020 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 That same day, the FDA granted a controversial emergency use authorization for hydroxychloroquine and chloroquine, allowing use against COVID-19. Beth Mole, Ars Technica, 24 Aug. 2022 Most treatments, including chloroquine, are directed at the blood stage of the parasite, and so cannot prevent recurrence of the infection and its associated symptoms. New York Times, 14 Mar. 2022 Those include hydroxychloroquine, used to treat rheumatoid arthritis, and chloroquine, used to treat malaria. Alyssa Jung, Good Housekeeping, 2 Oct. 2020 People diagnosed with malaria may receive antimalarial drugs like chloroquine or hydroxychloroquine, and primaquine, Eisele said. Julia Landwehr, Health, 30 June 2023

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

Word History


chlor- + quinoline

First Known Use

1946, in the meaning defined above

Time Traveler
The first known use of chloroquine was in 1946

Dictionary Entries Near chloroquine

Cite this Entry

“Chloroquine.” Dictionary, Merriam-Webster, Accessed 24 May. 2024.

Medical Definition


chlo·​ro·​quine ˈklōr-ə-ˌkwēn, ˈklȯr- How to pronounce chloroquine (audio)
: an antimalarial drug administered in the form of its diphosphate C18H26ClN3·2H3PO4 or hydrochloride C18H26ClN3·HCl

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