Iroxanadine (BRX-005) is a Novel small molecule MAPK p38 inhibitor that induces phosphorylation of p38 SAPK and induces concentration-dependent relaxation in guinea pig pulmonary artery preparations precontracted with phenylephrine.

AMG-548 is a potent and selective inhibitor of p38α with Ki of 0.5 nM, dispalys weak inhibition for p38β (Ki=3.6 nM), and >5,000-fold selectivity over p38γ and p38δ.

Scio-323 is an orally available p38 mitogen-activated protein (MAPK) kinase inhibitor.