Which medication is primarily used to treat asthma?

• A. Corticosteroids
• B. Beta-agonists
• C. Antihistamines
• D. Calcium channel blockers

Answer: (B)

Beta-agonists are primarily used to treat asthma because they work by stimulating beta-adrenergic receptors in the airways, leading to relaxation of bronchial smooth muscles. This action effectively opens up the airways, making it easier for individuals with asthma to breathe. They are often categorized into short-acting and long-acting beta-agonists, with short-acting formulations providing quick relief during an asthma attack and long-acting versions being used for maintenance therapy to help control chronic symptoms.

While corticosteroids are also important in asthma treatment, they primarily serve to reduce inflammation and prevent future exacerbations rather than providing immediate relief from acute symptoms. Antihistamines are primarily used for allergic reactions and are not effective in treating bronchoconstriction associated with asthma. Calcium channel blockers primarily affect cardiovascular function and do not play a role in the treatment of asthma. Thus, beta-agonists are the most directly effective in managing acute asthma symptoms.