Short-acting beta2-agonists (SABA) are used to provide rapid relief lasting how long?

Short-acting beta2-agonists (SABA) are used to provide rapid relief lasting how long?

• A. Cure chronic inflammation.
• B. Block beta receptors systemically.
• C. Provide rapid relief lasting 4-6 hours; relax airway smooth muscle.
• D. Reduce mucus production.

Answer: (C)

Short-acting beta-2 agonists rapidly relax bronchial smooth muscle by activating beta-2 receptors, leading to quick bronchodilation. This relief starts within minutes and typically lasts about 4–6 hours. They’re used for immediate symptom relief during an asthma attack or bronchospasm, not to cure chronic inflammation—which is addressed by anti-inflammatory therapies like inhaled corticosteroids. They don’t block beta receptors systemically; their main effect is widening the airways, and reducing mucus production isn’t their primary action.

Short-acting beta-2 agonists rapidly relax bronchial smooth muscle by activating beta-2 receptors, leading to quick bronchodilation. This relief starts within minutes and typically lasts about 4–6 hours. They’re used for immediate symptom relief during an asthma attack or bronchospasm, not to cure chronic inflammation—which is addressed by anti-inflammatory therapies like inhaled corticosteroids. They don’t block beta receptors systemically; their main effect is widening the airways, and reducing mucus production isn’t their primary action.