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quinidine vs. quinine

quinidine

[ kwin-i-deen, -din ]
noun
  1. a colorless, crystalline alkaloid, C20H24N2O2, isomeric with quinine, obtained from the bark of certain species of cinchona trees or shrubs, used chiefly to regulate heart rhythm and to treat malaria.

quinine

[ kwahy-nahyn, kwin-ahyn or, especially British, kwi-neen ]
noun
  1. a white, bitter, slightly water-soluble alkaloid, C20H24N2O2, having needlelike crystals, obtained from cinchona bark: used in medicine chiefly in the treatment of resistant forms of malaria.
  2. a salt of this alkaloid, especially the sulfate.

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