FenoterolTerbutalineAdrenergic beta-AgonistsButoxamineAdrenergic beta-2 Receptor AgonistsNebulizers and VaporizersTocolytic AgentsIpratropiumAtropine DerivativesBronchodilator AgentsAlbuterolEthanolaminesAdministration, InhalationChlorofluorocarbons, MethaneBupranololReceptors, Adrenergic, beta-2AerosolsAerosol PropellantsAsthmaProcaterolForced Expiratory VolumePeak Expiratory Flow RateBudesonideReceptors, Adrenergic, betaClenbuterolReceptors, Adrenergic, beta-3Double-Blind MethodPowdersAdrenergic beta-AntagonistsHypokalemiaCross-Over StudiesPropanolaminesAtenolol