An Old Friend – Methotrexate in Psoriatic Arthritis Methotrexate (MTX) remains one of our most used and reliable tools against a variety of rheumatic diseases, particularly in the care of peripheral arthritis such as PsA. https://t.co/zIsbL3KFlZ #ACR21 @_Castillo_Pedro https://t.co/Efm2kAx85x