 Medication Exclusion Prior to Visit 1 Short-acting beta-agonists e.g., albuterol 6 hours Ipratropium 6 hours Ipratropiumalbuterol combination product 6 hours Oral beta-agonists 48 hours Salmeterol and formoterol 48 hours Theophylline preparations 48 hours Tiotropium 48 hours Long-acting beta-agonistinhaled corticosteroid combination products e.g., ADVAIRTM or Symbicort 30 days Inhaled corticosteroids 30 days Oral or parenteral corticosteroids 30 days Any investigational drug 30 days 