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 as a bronchodilator by relaxing smooth muscles in the airways, making breathing easier. Commonly administered via inhalation to provide rapid relief of bronchospasm. Also used in some formulations for its ability to suppress premature labor due to its uterine muscle relaxant properties, though this use is less common. Its selectivity for β2 receptors reduces the risk of cardiac side effects compared to non-selective agents.