Table 2

Evidence for the efficacy of each class of treatment on the four major features of asthma

Treatment classSymptoms/VAOExacerbationsInflammationDecline in FEV1
VAO, variable airflow obstruction.
Short acting β2-agonists+?
Long acting β2-agonists+++?
Inhaled corticosteroids+++++++
Leukotriene antagonists+++?
Theophylline+?+?