Which of the following agents is typically used in a nebulizer treatment for bronchitis?

Bronchodilators are commonly used in nebulizer treatments for bronchitis because they work to relax and open the airways, making it easier for patients to breathe. In bronchitis, the airways may become inflamed and constricted, leading to symptoms like wheezing, coughing, and difficulty breathing. The administration of bronchodilators through a nebulizer delivers the medication directly to the lungs, providing rapid relief of these symptoms.

While antihistamines can alleviate some allergic symptoms and systemic corticosteroids may reduce inflammation, they are not primarily indicated for nebulizer treatment in bronchitis. Antibiotics, on the other hand, are used to treat bacterial infections and are not effective against viral bronchitis or in the usual management of the condition unless a secondary bacterial infection is present. Therefore, bronchodilators are the preferred choice in this context for their specific action on airway constriction.