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Pirfenidone capsules are drugs used to treat patients with idiopathic pulmonary fibrosis. This drug has multiple effects, including anti-fibrosis, anti-inflammatory and antioxidant effects. It can delay the progression of pulmonary fibrosis, reduce the decline of lung function, and improve the patient's cough symptoms. These aspects are also the main goals of the treatment of patients with idiopathic pulmonary fibrosis, that is, to alleviate symptoms, delay the progression of the disease and reduce mortality. Some patients need to pay attention when taking pirfenidone, such as patients with severe liver disease are prohibited from using this drug, and patients during pregnancy and lactation are prohibited from using this drug. This drug is also prohibited for patients with severe kidney disease or who require dialysis treatment.