Generic Symbicort Inhaler Uses, Interactions, Side effects Description Generic Symbicort is advised to control and prevent the symptoms caused by asthma or chronic obstructive pulmonary disease (COPD) – such as wheezing and shortness of breath. The medicine contains two active ingredients – Budesonide and Formoterol. Budesonide is a corticosteroid that works by reducing the swelling and irritation of the air passages. Formoterol is a beta agonist that works by opening the air passages to make breathing easier. For asthma, Generic Symbicort should be used when breathlessness is poorly controlled with other medications. Prior to using this asthma medication, it is important to know how to use this asthma inhaler medicine. It must be used regularly to notice an improvement. The drug does not work right away, so it should not be used as a relieving inhaler.