IpratropiumAlbuterolAtropine DerivativesBronchodilator AgentsNebulizers and VaporizersFenoterolAerosolsAdministration, InhalationCholinergic AntagonistsCromolyn SodiumOzone DepletionLung Diseases, ObstructiveScopolamine DerivativesForced Expiratory VolumeDrug IncompatibilityAsthmaBromidesAirway ResistancePeak Expiratory Flow RateDouble-Blind MethodPharmaceutic AidsChlorofluorocarbonsMetered Dose InhalersBronchoconstrictionRespiratory Function TestsAdrenergic beta-AgonistsBronchitis