Danixirin is a potent, competitive, selective and reversible antagonist of the chemokine receptor (CXCR2) (also known as interleukin 8B receptor). In preclinical models, danixirin blocked neutrophils chemotaxis in response to inflammation. The drug is being developed by GlaxoSmithKline for the treatment of chronic obstructive pulmonary disease, influenza, respiratory syncytial virus. In phase 2 clinical trials in patients with acute, uncomplicated influenza, danixirin was well tolerated and did not impede viral clearance.