NBRC Pharmacology Practice Exam 2026 – Complete Study Guide

Anticholinergic bronchodilators primarily work by blocking the action of acetylcholine on muscarinic receptors in the airway smooth muscle. This leads to relaxation of the bronchial muscles, resulting in bronchodilation. As a result, one of the main effects observed after administering these medications is improved airflow, which is essential for patients experiencing bronchoconstriction due to conditions like asthma or chronic obstructive pulmonary disease (COPD). Enhanced airflow improves breathing and reduces symptoms associated with airway obstructions, making this the correct and relevant effect to highlight for anticholinergic bronchodilator use.