Pirfenex may be used to treat adults with idiopathic pulmonary fibrosis (IPF), a lung condition that causes inflammation and scarring in the lungs. Pirfenex shows anti-fibrosing and anti-inflammatory properties in many systems in vitro and in animal models of pulmonary fibrosis (the fibrosis induced by bleomycin and transplantation). Assigned to adults suffering the idiopatic pulmonary fibrosis.