Treatment of asthma can be divided into long-term control and quick-relief medications.

Long-term control medications are taken daily to maintain control of persistent asthma. They primarily serve to control airway inflammation.

The quick-relief medications are taken to achieve prompt reversal of an acute asthma “attack” by relaxing bronchial smooth muscle.

Many asthma medications can be administered orally or by inhalation. Metered-dose inhalers (MDI’s) are the most widely used method, but...