1 Since some types of lung fibrosis can respond to corticosteroids (such as prednisone) and/or other medications that suppress the body's immune system, these types of drugs are sometimes prescribed in an attempt to slow the processes that lead to fibrosis.iseases and conditions that may cause pulmonary fibrosis as a secondary effect include: 1  Inhalation of environmental and occupational pollutants, such as metals in asbestosis, silicosis and exposure to certain gases. 2  Hypersensitivity pneumonitis, most often resulting from inhaling dust contaminated with bacterial, fungal, or animal products. 3  Cigare