TerbutalineStereoisomerismAdrenergic beta-AgonistsTocolytic AgentsNebulizers and VaporizersBronchodilator AgentsAdministration, InhalationBudesonideAdrenergic beta-2 Receptor AgonistsEthanolaminesAerosolsButoxamineButylaminesAlbuterolPeak Expiratory Flow RatePregnenedionesAsthmaMetaproterenolMonoterpenesTramadolFenoterolReceptors, Adrenergic, beta-2Forced Expiratory VolumePrenalterolPropranololMaximal Expiratory Flow RateCapillary Leak SyndromeMagnetocardiographyChlorofluorocarbonsDouble-Blind MethodReceptors, Adrenergic, betaPowdersCross-Over StudiesPropanolaminesGlutethimideDose-Response Relationship, DrugAdrenergic beta-AntagonistsChromatography, High Pressure Liquid