After screening, subjects will enter a 4 week open-label run-in period with fluticasone furoate (FF)/vilanterol (VI) 100/25 mcg administered once daily via dry powder inhaler (DPI). Subjects will then be randomized to receive any one of the 3 treatments (umeclidinium bromide \[UMEC\] \[62.5 mcg\] administered once daily via a DPI; OR UMEC \[125 mcg\] administered once daily via a DPI; OR matching placebo administered once daily via a DPI), while continuing treatment with open label FF/VI 100/25 mcg during a 12-week treatment period. There will be a total of eight scheduled clinic visits at Pre-Screening (Visit0), Screening (Visit 1), blinded treatment Day 1(Visit2), 2(Visit3), 28 (Visit4), 56 (Visit5), 84 (Visit6) and 85 (Visit7). A follow-up phone contact will be conducted approximately 7 days after the last clinic visit. The total duration of subject participation in the study from Screening to Follow-up will be approximately 17 weeks.
Dry white powder containing 100mcg of Fluticasone Furoate blended with lactose per blister was administered by DPI.
Dry white powder containing 25mcg of Vilanterol micronised drug (as the 'M' salt triphenylacetate) blended with lactose and magnesium stearate per blister was administered by DPI.
Umeclidinium bromide in a powder blend with lactose and magnesium stearate was used at two different doses 62.5mcg and 125mcg.
The matching placebo DPI identical in appearance to the inhaler containing active study medication.
Buenos Aires, Argentina
Buenos Aires, Argentina
Buenos Aires, Argentina
Buenos Aires, Argentina
Mendoza, Argentina
Mendoza, Argentina
San Miguel de Tucumán, Argentina