Metered Dose InhalersNebulizers and VaporizersDry Powder InhalersAdministration, InhalationChlorofluorocarbonsAerosol PropellantsBronchodilator AgentsPowdersAlbuterolAerosolsBeclomethasoneInhalation SpacersFenoterolAsthmaIpratropiumAnti-Asthmatic AgentsHydrocarbons, FluorinatedBudesonideTerbutalineRespiratory System AgentsEquipment DesignEthanolaminesPregnenedionesForced Expiratory VolumeChlorofluorocarbons, MethaneDouble-Blind MethodCross-Over StudiesHoarsenessPeak Expiratory Flow RateAndrostadienesAtropine DerivativesParticle SizeAdrenergic beta-AgonistsCromolyn SodiumPregnadienediolsPulmonary Disease, Chronic ObstructiveDrug Delivery SystemsRespiratory TherapyLung Diseases, ObstructiveChemistry, PharmaceuticalTechnetiumTechnology, PharmaceuticalBiological AvailabilityLungDrug Administration ScheduleTreatment OutcomeGlucocorticoidsScopolamine DerivativesAdrenal Cortex HormonesVital CapacityAnti-Inflammatory AgentsDrug CombinationsPatient Education as TopicHydrocortisoneTherapeutic EquivalencyAdrenergic beta-2 Receptor AgonistsCholinergic AntagonistsPatient ComplianceDose-Response Relationship, DrugInspiratory CapacityDrug Therapy, CombinationSelf AdministrationMaximal Expiratory Flow RateBronchiRespiratory Function TestsOzone DepletionAdministration, OralTime FactorsPatient PreferenceBronchial SpasmMedication AdherenceRadiation DosageInhalationLethal Dose 50