Uses: this product contains 2 medications, budesonide and formoterol. it is an inhaler used as a long-term (maintenance) treatment to prevent or decrease wheezing and trouble breathing caused by asthma or ongoing lung disease (such as copd). it works in the airways by decreasing swelling and relaxing muscles. controlling symptoms of breathing problems can decrease time lost from work or school.this product should not be used to treat sudden attacks of breathing trouble. your doctor should prescribe a quick-relief inhaler (e.g., albuterol/salbutamol) for sudden shortness of breath/asthma attacks while you are using this medication. you should always have a quick-relief inhaler with you. consult your doctor or pharmacist for more details.in patients with asthma, this medication should not be used when breathing problems can be controlled with inhaled corticosteroids (e.g., flunisolide, fluticasone) and occasional use of quick-relief inhalers.