Pharmacology · single question
CASE 8 — What is the mechanism of action of albuterol?
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Correct answer: A. Beta-2 adrenergic agonist
- A. Albuterol (salbutamol) is a SHORT-acting beta-2 adrenergic agonist (SABA). It selectively stimulates β2 receptors in bronchial smooth muscle → bronchodilation. It is the classic rescue inhaler for acute asthma/bronchospasm episodes.
- B. Beta-1 agonists (e.g., dobutamine) act primarily on the heart — not used for bronchodilation.
- C. A beta-2 antagonist would cause bronchoconstriction — the opposite and absolutely contraindicated in asthma.
- D. Beta-1 antagonists (beta-blockers like metoprolol) slow the heart rate.