"leucovorin." YourDictionary, n.d. Web. 18 January 2019. <https://www.yourdictionary.com/leucovorin>.
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leucovorin - Medical Definition
A form of folic acid that is used to counteract the toxic effects of folic acid antagonists such as methotrexate and is also given as an adjuvant to increase the effectiveness of certain chemotherapy drugs, such as fluorouracil. It is usually given in the form of its calcium salt.