Some adults with mild persistent asthma may be able to adequately control their asthma by taking corticosteroids only when needed, instead of taking anti-inflammatory medication daily, according to new results from the Improving Asthma Control Trial (IMPACT). Conducted by the National Heart, Lung, and Blood Institute?s (NHLBI) Asthma Clinical Research Network, the one-year, multi-center study found that participants who were treated with corticosteroids intermittently based on symptoms had about the same rate of severe exacerbations and of asthma-related lung function decline as those treated with the standard recommendation of daily long-term control medication.