
Cinchonism or quinism is a pathological condition caused by an overdose of quinidine or its natural source, cinchona bark. Quinine is medically used to treat malaria. In much smaller amounts, quinine is an ingredient of tonic drinks, acting as a bittering agent. Cinchonism can occur from therapeutic doses of quinine, either from one or several lar...
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http://en.wikipedia.org/wiki/Cinchonism

• (n.) A condition produced by the excessive or long-continued use of quinine, and marked by deafness, roaring in the ears, vertigo, etc.
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(from the article `drug`) ...and sulfadoxine, is used to treat infections caused by chloroquine-resistant P. falciparum. A high level of quinine in the plasma frequently is ...
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http://www.britannica.com/eb/a-z/c/85

Poisoning by cinchona, quinine, or quinidine; characterised by tinnitus, headache, deafness, and occasionally, anaphylactoid shock. ... Synonym: quininism. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973

(sin´ko-niz″әm) toxicity due to overdosage of cinchona alkaloids; symptoms are tinnitus and slight deafness, photophobia and other visual disturbances, mental dullness, depression, confusion, headache, and nausea. Called also quininism.
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Illness resulting from prolonged use of quinine
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Cin'cho·nism noun [ From
Cinchona .]
(Medicine) A condition produced by the excessive or long-continued use of quinine, and marked by deafness, roaring in the ears, vertigo, etc.
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http://www.encyclo.co.uk/webster/C/79

Type: Term Pronunciation: sin′kō-nizm Definitions: 1. Poisoning by cinchona, quinine, or quinidine; characterized by tinnitus, headache, deafness, and occasionally, anaphylactoid shock. Synonyms: quininism
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poisoning by any of the cinchona alkaloids, characterized by headache, deafness, and ringing in the ears.
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https://www.infoplease.com/dictionary/cinchonism
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