Used as a bronchodilator in the treatment of respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD). It helps relax the smooth muscles of the airways, improving airflow and easing breathing. Due to its selective action on beta-2 adrenergic receptors, it is effective in reducing bronchospasm and is administered via inhalation or oral routes in some regions. Its use has declined with the development of newer, longer-acting bronchodilators with fewer side effects.