Folate supplementation and methotrexate treatment in rheumatoid arthritis: a review

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Abstract
Objectives. The folate antagonist methotrexate (MTX) has become established as the most commonly used disease-modifying anti-rheumatic drug (DMARD) in the treatment of rheumatoid arthritis (RA) but is commonly discontinued due to adverse effects. Adverse effects are thought to be mediated via folate antagonism. In this paper we summarize the current data on the use of folates as a supplement to MTX use in RA for the prevention of adverse effects and as a potential modulator of cardiovascular risk, and propose guidelines for standard practice.

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