Final answer:
Pirfenidone is used to treat idiopathic pulmonary fibrosis, a progressive lung disease that causes scarring of lung tissue, resulting in a decrease in lung function.
Step-by-step explanation:
The pharmaceutical agent Pirfenidone is sometimes used for the treatment of a respiratory condition called idiopathic pulmonary fibrosis (IPF). IPF is a chronic, progressive lung disease characterized by scarring of the lung tissue which leads to a continual decline in lung function. It often results in symptoms such as a persistent dry cough, fatigue, shortness of breath, and chest discomfort. Pirfenidone works by reducing fibroblast proliferation, reducing the production of fibrosis-promoting substances, and ultimately slowing down the progression of the disease. It is important for those with IPF to have regular check-ups as the disease can lead to other serious conditions, including respiratory failure.