Mac-Fenid Tablets 267mg – Pirfenidone for Idiopathic Pulmonary Fibrosis (IPF)Mac Fenid Tablets 267mg Pirfenidone for Lung Fibrosis Management Mac Fenid Tablets 267mg contain Pirfenidone, a prescription medicine used to treat Idiopathic Pulmonary Fibrosis (IPF). IPF is a chronic and progressive lung disease where scar tissue builds up in the lungs, leading to difficulty in breathing. While Pirfenidone does not cure the condition, it helps slow down lung scarring and disease progression, improving the patients quality of life.