Bronchial asthma is a disorder characterized by airway inflammation, airway hyperresponsiveness, and reversible airway obstruction. The most important therapy is the treatment of airway inflammation (controller), and subsequently use of bronchodilator as needed (reliever). The most effective controller is inhaled steroids, and most convenient reliever is inhaled rapid-acting beta2 agonists. The strategy for asthma therapy is to understand how to use which kind of drug.