What type of medication is commonly used as a rescue inhaler for asthma?

A short-acting beta-agonist (SABA) is commonly used as a rescue inhaler for asthma due to its rapid onset of action, typically within minutes, and relatively short duration of effect. These medications, such as albuterol, are designed to provide quick relief from acute asthma symptoms by relaxing the bronchial smooth muscle, thereby opening the airways and allowing for easier breathing. This makes them particularly effective during asthma attacks or when symptoms suddenly worsen.

In contrast, long-acting beta-agonists (LABAs) are used for long-term control and are not suitable for quick relief because they take longer to start working and are intended for chronic management of asthma rather than immediate symptom relief. Inhaled corticosteroids are anti-inflammatory medications that help manage asthma over time but do not provide immediate relief of acute symptoms. Phosphodiesterase (PDE) inhibitors also do not function as rescue inhalers and are primarily used for different conditions. This distinction emphasizes the role of SABAs as the first-line option for rapid relief in acute asthma situations.