Which medication class is useful in the maintenance treatment of chronic asthma?

Leukotriene modifiers are a key class of medications used in the maintenance treatment of chronic asthma. They work by blocking the action of leukotrienes, which are inflammatory mediators that contribute to airway constriction, mucus production, and airway edema. By inhibiting these substances, leukotriene modifiers help to reduce asthma symptoms and decrease the frequency of asthma attacks, making them particularly valuable in a long-term management strategy.

In contrast, beta agonists, while effective as bronchodilators, are primarily used for quick relief during acute asthma exacerbations rather than for long-term control. Antihistamines are mainly effective for allergic reactions and do not specifically address the inflammatory processes central to asthma. Nasal corticosteroids, although effective for rhinitis, are not indicated for asthma treatment. Therefore, among the options, leukotriene modifiers stand out as the most appropriate choice for the maintenance treatment of chronic asthma.