quin·​i·​dine ˈkwi-nə-ˌdēn How to pronounce quinidine (audio)
: an alkaloid C20H24N2O2 that is stereoisomeric with quinine and is used in the form of its sulfate or gluconate to treat cardiac rhythm irregularities

Example Sentences

Recent Examples on the Web As quinidine supplies dwindled, the Centers for Disease Control and Prevention made available artesunate, a better drug that is the international gold standard for treating severe malaria, free of charge via request. Aileen Ahiskali, STAT, 12 June 2021 Artesunate costs about $30,000 for an average course of treatment for an adult, compared to less than $200 for quinidine in 2018. Aileen Ahiskali, STAT, 12 June 2021 The treatment system that has emerged in the absence of quinidine is far from perfect, Travassos said. Haley Weiss, Scientific American, 23 Aug. 2019 Pharmaceutical companies other than Eli Lilly could step in and manufacture quinidine in the meantime, a solution that Travassos conceded is unlikely to happen without financial incentives. Haley Weiss, Scientific American, 23 Aug. 2019 Some of the drugs were discovered a century ago or earlier, including benzocaine (a local anesthetic sometimes put in cough drops) and quinidine (a treatment for heart rhythm disorders). Jonathan Saltzman, BostonGlobe.com, 12 May 2018 In the early 2000s, Smith combined dextromethorphan — the main ingredient in cough syrups such as Robitussin — with quinidine, a drug used to treat irregular heart rhythms. Julie Appleby, Kaiser Health News, 16 May 2017 See More

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

Word History


International Scientific Vocabulary, from quinine

First Known Use

1836, in the meaning defined above

Time Traveler
The first known use of quinidine was in 1836

Dictionary Entries Near quinidine

Cite this Entry

“Quinidine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/quinidine. Accessed 28 Jan. 2023.

Medical Definition


quin·​i·​dine ˈkwin-ə-ˌdēn How to pronounce quinidine (audio) -dən How to pronounce quinidine (audio)
: a crystalline dextrorotatory stereoisomer of quinine found in some species of cinchona and used chiefly in the form of its hydrated sulfate (C20H24N2O2)2·H2SO4·2H2O to treat irregularities of cardiac rhythm and sometimes in place of quinine as an antimalarial

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