- Patient with a diagnosis of moderate to severe COPD according to the GOLD Guidelines classification (stages II and III) at the Screening Visit: FEV1 measured between 10-15 minutes post inhalation of 400 micro grams of salbutamol is 30% < FEV1 < 80% of the predicted normal value (i.e., 100 x Post-salbutamol FEV1/ Predicted FEV1 must be < 80% and ≥ 30%).