Leucovorin is a vitamin complex used to treat advanced colon cancer. By itself, leucovorin isn't able to fight cancer at all. Rather, it helps patients by increasing the effectiveness of another drug, fluorouracil. Leucovorin is sold under the brand name Wellcovorin.
For more detailed information about leucovorin, please visit the leucovorin information page.
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Source: Drug Finder: Leucovorin. About.com. Accessed 28 Jan. 2008 [http://drugsaz.about.com/od/drugs/leucovorin.htm].