Updated September 17, 2013.

Definition:

A bronchodilator is an asthma medication that relaxes the smooth muscles and functionally enlarges the size of the airways of the lung. Bronchodilators come as both short-acting beta agonists (SABA) and long-acting beta agonists (LABA).

Bronchodilators improve symptoms by opening up the airways of the lung. This decreases asthma symptoms and makes it easier for you to breathe.

SABAs are used as a quick relief medication, while LABAs are used as a controller medication.

Bronchodilators can be prescribed as both inhaled and oral forms, although the inhaled form is preferred.