A long-acting sulfonamide, used with quinine and pyrimethamine to reduce the relapse rate of malaria. SYN: sulformethoxine.
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sul·fa·dox·ine (sul″fə-dokґsēn) a long-acting sulfonamide used in combination with pyrimethamine in the prophylaxis and treatment of chloroquine-resistant falciparum malaria.Medical dictionary. 2011.