Effect of Low-Dose Methotrexate on eGFR and Kidney Adverse Events: A Randomized Clinical Trial

BACKGROUND: Low-dose methotrexate (LD-MTX) is contraindicated in advanced CKD, but kidney safety in normal kidney function or mild-to-moderate CKD is less clear. METHODS: We performed a secondary analysis for eGFR and kidney AEs using the randomized double-blind, placebo-controlled Cardiovascular Inflammation Reduction Trial. Adults with cardiovascular disease and diabetes and/or metabolic syndrome were randomly allocated to oral LD-MTX (target dose 15–20 mg/week) or placebo. All participants took folic acid 1 mg 6 days/week. Exclusion criteria included systemic rheumatic disease and creatinine clearance