[Tissue concentrations of non-steroidal anti-inflammatory agents in chronic polyarthritis patients].

Non-steroidal antiinflammatory drugs (NSAID) are indispensable for modern treatment of rheumatoid arthritis. Reports on drug concentration in rheumatoid human tissues are still lacking. We now report about steady-state concentrations of Indomethacin and Acemetacin in blood, synovial fluid, synovial membrane, muscle, bone and fat 6h after the last application of Acemetacin resp. Indomethacin. Levels in all tissues, except fat, were found to be significantly higher than in blood. Therefore, a noticeable accumulation of drug occurs in all rheumatoid tissues.