- The use of the following medications will exclude subjects from entering the study: Oral or parenteral steroids- 6 months; Omalizumab- less than 12 months; Short and long-acting anticholinergics- Stop at time of run-in; Antileukotrienes, beta-adrenergic blocking agents, inhaled cromolyn sodium or nedocromil, macrolide antibiotics- Stop at time of run-in