Here's help to kill that craving. Asthma Asthma can be defined clinically as a condition of intermittent, reversible airway constriction, due to a hyperreactivity to certain substances producing inflammation . In an asthma attack the smooth muscles of the lungs go into spasm with the surrounding tissue inflammed and secreting mucus into the airways. Thus, the diameter of the airways is reduced causing the characteristic wheezing as the person affected breathes harder to get air into the lungs.
Attacks can vary in intensity and frequency.
These two drugs are generally used to prevent an attack but are not so useful when treating an attack. They are relatively safe but expensive and need to be taken regularly, even when one is free of symptoms.