Methotrexate intolerance in rheumatoid arthritis Methotrexate (MTX) is the most commonly used DMARD in rheumatoid arthritis (RA); however, there is significant intolerance to this drug among adult RA patients - especially at doses above 15 mg per week. https://t.co/aizooTPNTe https://t.co/FZ52bwHBfq