ExpectorantsBromhexineBronchodilator AgentsDithioerythritolMucusCarbocysteineAcetylcysteineAlbuterolSputumIpratropiumVerrucomicrobiaNebulizers and VaporizersAdministration, InhalationAsthmaScopolamine DerivativesForced Expiratory VolumeTerbutalinePulmonary Disease, Chronic ObstructiveAdrenergic beta-2 Receptor AgonistsCholinergic AntagonistsSpirometryPharmacologyPharmacology, ClinicalAdrenergic beta-AgonistsMetaproterenolMetered Dose InhalersPeak Expiratory Flow RateRespiratory Function TestsVital CapacityInhalation SpacersLung Diseases, ObstructiveAerosolsBronchoconstrictionAirway ResistanceCystic FibrosisFenoterolBronchiolitisAdrenal Cortex HormonesAirway ObstructionEthanolaminesIndansRacepinephrineDouble-Blind MethodRespiratory TherapyTheophyllineAntitussive AgentsBronchial Provocation TestsBronchiAnti-Asthmatic AgentsAtropine DerivativesMuscarinic AntagonistsGlycopyrrolateMethacholine ChlorideAminophyllineDyspneaLungCoughCross-Over StudiesBronchitisFunctional Residual CapacityQuinolonesBeclomethasoneRespiratory SoundsClemastineBudesonideTreatment OutcomeOxygen Inhalation TherapyDrug Therapy, CombinationTracheaCromolyn SodiumChlorofluorocarbonsInspiratory CapacityGlucocorticoidsDose-Response Relationship, DrugRespiratory Therapy Department, HospitalMaximal Expiratory Flow RateBronchial SpasmReceptors, Adrenergic, beta-2HistamineNedocromilRespiration DisordersBronchoconstrictor AgentsForced Expiratory Flow RatesDrug Administration ScheduleHistamine AgentsAmino Alcohols