Digihaler FB 400 Inhaler 120 mdi is primarily used to treat the signs and symptoms of COPD and asthma (COPD). A chronic (long-term) respiratory illness called asthma causes the airways to constrict, swell, and generate excess mucus, which makes breathing difficult. Emphysema (breathlessness) and chronic bronchitis are two of the lung disorders that make up COPD (inflammation of the lining of bronchial tubes). A combination of two medications called Digihaler FB 400 Inhaler 120 mdi includes the corticosteroid Budesonide and the formoterol fumarate (LABA - long-acting beta-agonists or bronchodilator). Budesonide is a member of the corticosteroid class, which reduces inflammation and swelling by working inside the cells lining the nasal tube and the airways and halting the production of certain molecules that cause allergic reactions and inflammatory reactions.Disclaimer:For more information contact your physician.