Overview Airway Clearance Study Status: Completed Trial end date: 2007-07-01 Target enrollment: Participant gender: Summary The purpose of the study is to evaluate how the airways in COPD patients, compared to healthy volunteers, absorb steroid drugs from Symbicort Turbuhaler and Seretide Diskus. The blood concentrations of the steroids will be used as surrogate marker. Phase: Phase 4 Details Lead Sponsor: AstraZenecaTreatments: BudesonideBudesonide, Formoterol Fumarate Drug CombinationFluticasoneFormoterol FumarateSalmeterol Xinafoate