Beta-blockers, or beta-adrenergic blocking agents, are medications that are used to treat high blood pressure, chest pain, irregular heart rhythm, glaucoma, tremors and migraines. They are also known to prevent risk of further heart attacks. Examples of beta-blockers are Propranolol, Metoprolol, Nadolol, etc.

Beta-blockers block the effects of the hormone epinephrine (adrenaline) on the nerves, consequently reducing the heart rate, and blood pressure. Common side effects of beta-blockers include fatigue, dizziness, cold hands, weakness, and loss of libido; sleep deprivation and sometimes shortness of breath. This can lead to the development of asthma attacks in patients with asthma.

Beta-blockers can stimulate the muscles around air passages, contracting them, thus narrowing the airways. This causes obstruction in airflow, and hence triggers asthma attacks. But this is what happens initially. Recent research has shown that, despite the initial worsening of asthma, beta-blockers can actually help asthma in the long run.

A study by associate professor Richard Bond, at the University of Houston, revealed that regular use of beta-blockers alleviates asthma conditions. After continued use, beta-blockers can help smooth and relax the muscles around the airways, which makes the passages expand and allow free movement of airflow.

Therefore, according to the study, beta-blockers can be used to treat asthma in the long run, reduce the severity of attacks, and improve the condition of the asthma patient.