Overview Study to Investigate the Effect of Formoterol vs Salmeterol on Small Airways Physiological Parameters in COPD Patients Status: Completed Trial end date: 2012-09-01 Target enrollment: Participant gender: Summary This is a crossover Study to investigate the effect of Formoterol versus Salmeterol on small airways physiological parameters in COPD patients. Phase: Phase 4 Details Lead Sponsor: Chiesi Farmaceutici S.p.A.Treatments: Formoterol FumarateSalmeterol Xinafoate