Comparison of the Efficacy of Pirfenidone and Nintedanipine in Pulmonary Fibrosis

The goal of this observational study is to compare the effects of pirfenidone and nintedanib on lung function and radiologic findings in fibrotic lung diseases. The main question it aims to answer is: • Do these two drugs have equivalent effects on progression in patients with pulmonary fibrosis? If there is a comparison group: The investigators will compare patients with pulmonary fibrosis receiving pirfenidone with patients with pulmonary fibrosis receiving nintedanip. The investigators will compare patients with pulmonary fibrosis receiving pirfenidone and patients with pulmonary fibrosis receiving nintedanip. Pulmonary function test parameters at 3rd, 6th, 9th and 12th months and differences of 6 MWT parameters compared to baseline will be compared between the two groups.