quinidine vs. quinine

quinidine

[kwin-i-deen, -din] / ˈkwɪn ɪˌdin, -dɪn /

noun

Pharmacology.

a colorless, crystalline alkaloid, C 2 0 H 2 4 N 2 O 2 , 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, kwi-neen] / ˈkwaɪ naɪn, ˈkwɪn aɪn, kwɪˈnin /

Chemistry, Pharmacology.

a white, bitter, slightly water-soluble alkaloid, C 2 0 H 2 4 N 2 O 2 , having needlelike crystals, obtained from cinchona bark: used in medicine chiefly in the treatment of resistant forms of malaria.
a salt of this alkaloid, especially the sulfate.