Used primarily as a selective β2-adrenergic receptor agonist in the treatment of respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD). It functions by relaxing the smooth muscles in the airways, leading to bronchodilation and improved airflow. Its selectivity for β2 receptors minimizes cardiac side effects compared to non-selective agonists. Commonly administered via inhalation to achieve rapid onset of action with lower systemic exposure. Also investigated for use in managing premature labor due to its uterine muscle relaxant properties, though this application is less common.