A 21-year-old man with history of asthma comes to emergency 2 hours after acute-onset wheezing that did not respond to albuterol. One hour following administration of nebulized albuterol and intravenous methylprednisolone, his lungs are clear to auscultation and FEV1 has increased from 30% to 95% of predicted. Which of the following is the most effective pharmacologic agent to prevent asthma recurrence?
Inhaled cromolyn sodium
Inhaled ipratropium
Oral prednisone
Oral theophylline
Oral zileuton
