Japanese nationwide survey of 1943 RMD pts taking Azathioprine (AZA) 34% had adverse events: hepatobiliary (149%), GI (10%), blood/lymphatic (9%), infections (5%), & skin (2.4%). AEs lead to 71% D/C AZA. Serious AEs (Gr ≥3) higher w/ older (OR 2.5), & SLE (OR 2.3) https://t.co/lVNYVQATfx