LevalbuterolAlbuterolDrug IncompatibilityMetered Dose InhalersBronchodilator AgentsAdrenergic beta-AgonistsNebulizers and VaporizersAdministration, InhalationIpratropiumAdrenergic beta-2 Receptor AgonistsInhalation SpacersRacepinephrineBronchial SpasmOzone DepletionAsthmaChlorofluorocarbonsAerosol PropellantsBronchoconstrictionRespiratory Therapy Department, HospitalAerosolsForced Expiratory VolumeBronchiolitisAnti-Asthmatic AgentsDouble-Blind MethodForced Expiratory Flow RatesEquipment DesignReceptors, Adrenergic, beta-2BeclomethasoneMasksModels, AnatomicDrug Administration SchedulePulmonary Disease, Chronic ObstructiveAirway ResistanceMyasthenic Syndromes, CongenitalBronchial Provocation TestsTreatment OutcomeRespiratory TherapyStereoisomerismEquipment SafetyManikinsRespiratory Function TestsDrug CombinationsPropanolaminesBudesonide