Folinic acid, also known as leucovorin, is a medication used to decrease the toxic effects of methotrexate and pyrimethamine. It is also used in combination with 5-fluorouracil to treat colorectal cancer and pancreatic cancer, and may be used to treat folate deficiency, anemia, and methanol poisoning. It is taken by mouth, injection into a muscle, or injection into a vein.
Read the full article on Wikipedia“Folinic acid is a 5-formyl derivative of tetrahydrofolic acid. It is readily converted to other reduced folic acid derivatives (e.g., 5,10-methylenetetrahydrofolate, 5-methyltetrahydrofolate), thus has vitamin activity equivalent to that of folic acid. Since it does not require the action of dihydrofolate reductase for its conversion, its function as a vitamin is unaffected by inhibition of this enzyme by drugs such as methotrexate. This is the classical view of folinic acid rescue therapy. In the 1980s, however, folinic acid was found to reactivate dihydrofolate reductase itself even when methotrexate exists.”
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