Used as a bronchodilator in the management of asthma and chronic obstructive pulmonary disease (COPD). It helps relax the smooth muscles of the airways, improving airflow and reducing symptoms such as wheezing, shortness of breath, and chest tightness. Often administered via transdermal patches or oral formulations for prolonged effect, especially in nocturnal asthma. Its selective action on beta-2 adrenergic receptors minimizes cardiac side effects compared to non-selective agents.