- Short-Acting Beta2-Agonist: All subjects must be able to replace short-acting beta2-agonists with albuterol/salbutamol inhalation aerosol at Visit 1 for use as-needed for the duration of the study. Subjects must be able to withhold all inhaled short-acting beta-sympathomimetic bronchodilators for at least 6 hours prior to study visits.Note: Nebulized albuterol/salbutamol will not be allowed during the study with the exception of its use during reversibility testing at Visit 1. The use of albuterol/salbutamol through the DISKUS/ACCUHALER device will not be allowed during the study.