ZK824859 is an oral available and selective urokinase plasminogen activator (uPA) inhibitor with IC50s of 79?nM, 1580?nM and 1330?nM for human uPA, tPA, and plasmin, respectively. ZK824859 is 5 fold less potent and has lost selectivity in mouse: uPA IC50=410?nM; tPA IC50=910?nM; plasmin IC50=1600?nM compared to human IC50 values of 79?nM, 1580?nM and 1330?nM respectively. ZK824859 shows efficacy in acute and chronic EAE model for multiple sclerosis. In a chronic mouse EAE model at a dose of 50?mg/kg b.i.d. ZK824859 completely prevents the development of disease. However, two lower doses (25 and 10?mg/kg) have no effect on clinical scores. In an acute mouse EAE model, ZK824859 is also efficacious. In this study the 50 and 25?mg/kg b.i.d. doses show a reduction in clinical scores compared to the control group, although only the 25?mg/kg treatment regime is statistically significant compared to the control group.