AlbuterolAdrenergic beta-2 Receptor AgonistsAdrenergic beta-AgonistsReceptors, Adrenergic, beta-2Bronchodilator AgentsNebulizers and VaporizersAdministration, InhalationIpratropiumAtropine DerivativesAsthmaFenoterolEthanolaminesForced Expiratory VolumeMetered Dose InhalersDopamine AgonistsPeak Expiratory Flow RateMetaproterenolAerosolsAminophyllineDouble-Blind MethodCross-Over StudiesPowdersDose-Response Relationship, DrugBronchoconstrictionInhalation SpacersAmino AlcoholsIsoproterenolAirway ResistanceTerbutalineMethacholine ChlorideGABA AgonistsReceptors, Adrenergic, betaAdrenergic beta-2 Receptor AntagonistsAdrenergic AgonistsPurinergic P1 Receptor AgonistsBronchial Provocation TestsBronchial Spasm