After being informed about the study and potential risks, all patients giving written informed consent will undergo a 1-week screening period to determine eligibility for study entry. At week 0, patients who meet the eligibility requirements will be randomized in a double-blind manner (participant and investigator) in a 1:1 ratio to Iguratimod (25mg, twice daily) combined with Tofacitinib (5mg, twice daily) or placebo (25mg, twice daily) combined with Tofacitinib (5mg, twice daily).
The purpose of this study is to assess the efficacy and safety of Iguratimod combined with Tofacitinib in the treatment of csDMARD-IR patients with active moderate-to-severe rheumatoid arthritis