Drugs for preventing and treating asthma

[Gregory]

Drugs allow most people with asthma to lead relatively normal lives. Most of the drugs used to treat an asthma attack can be used (often in lower doses) to prevent attacks. (See also Asthma.)
Therapy is based on two classes of drugs:

Anti-inflammatory drugs
Bronchodilators

Anti-inflammatory drugs suppress the inflammation that narrows the airways. Anti-inflammatory drugs include corticosteroids (which can be inhaled, taken by mouth, or given intravenously), leukotriene modifiers, and mast cell stabilizers.
Bronchodilators help to relax and widen (dilate) the airways. Bronchodilators include beta-adrenergic drugs (both those for quick relief of symptoms and those for long-term control), anticholinergics, and methylxanthines.
Other types of drugs that directly alter the immune system (called immunomodulators) are sometimes used for people with severe asthma, but most people do not need immunomodulators.