Hos patienter med reumatoid artrit havde celecoxib ingen signifikant virkning på farmakokinetikken (plasma - eller renal clearance) af methotrexat (i reumatologiske doser).
17 In patients with rheumatoid arthritis celecoxib had no statistically significant effect on the pharmacokinetics (plasma or renal clearance) of methotrexate (in rheumatologic doses).