 Medicationa Exclusion Period Prior to Visit 1 andor Visit 2 Inhaled corticosteroidlong-acting beta2-agonist combination product e.g., ADVAIR 14 days Inhaled anticholinergics e.g., Atrovent, Combivent, Spiriva 24 hours Theophylline products 48 hours Inhaled cromolyn or nedocromil 24 hours Inhaled corticosteroids 12 hours Long-acting beta2-agonists e.g., Foradil, SEREVENTTM 14 days Oral beta2-agonists 12 hours Inhaled short-acting beta2-agonistsb e.g., Proventil 6 hours Xolair 12 months 