Which of the following is a leukotriene inhibitor?

Zafirlukast (Accolate) is indeed a leukotriene inhibitor. Leukotrienes are inflammatory mediators that play a significant role in the pathophysiology of asthma, contributing to airway inflammation, bronchoconstriction, and mucus secretion. By inhibiting leukotriene receptors, zafirlukast helps to reduce asthma symptoms and improve lung function.

In contrast, bitolerol is a bronchodilator that acts as a beta-agonist, and ipratropium bromide is an anticholinergic agent commonly used to relieve bronchospasm. Nedocromil sodium, on the other hand, is a mast cell stabilizer that works by preventing the release of inflammatory mediators from mast cells. None of these options primarily inhibit leukotrienes, which is the mechanism that zafirlukast specifically targets. Therefore, zafirlukast is correctly identified as a leukotriene inhibitor.