This will be the first time that GSK961081 and fluticasone propionate will be administered as a blend in humans. In previous clinical studies conducted in Chronic Obstructive Pulmonary Disease (COPD) patients, GSK961081 has been administered on a background of fluticasone propionate without any observed systemic pharmacodynamic interaction. In this study GSK961081 and fluticasone propionate will be administered in a blended formulation from a single device and compared with GSK961081 and fluticasone propionate administered alone and concurrently. The aim of the study will be to investigate any differences in pharmacodynamics and/or pharmacokinetics for GSK961081 and fluticasone propionate when administered as the blend, concurrently or alone.~Pharmacokinetic, pharmacodynamic and safety information will be gathered to assess the suitability of the GSK9610981/fluticasone propionate blend for further development.Each subject will receive four treatments (GSK961081 alone, fluticasone propionate alone, GSK961081 and fluticasone propionate concurrently, and GSK961081/fluticasone propionate blend) in randomized order, in four treatment periods, each separated by a washout period of at least a week. All treatments will be administered via a DISKUS inhaler.~Pharmacokinetics, pharmacodynamics and safety will be assessed by measurement of plasma GSK961081, plasma fluticasone propionate, serum cortisol, urine cortisol, blood glucose, serum potassium, Forced Expiratory Volume in one second (FEV1), heart rate, 12-lead Electrocardiograms (ECGs), clinical laboratory tests and collection of adverse events (AEs).
In the current study GSK961081 and fluticasone propionate will be administered in a blended formulation from a single device and compared with GSK961081 and fluticasone propionate administered alone and concurrently. This is a single centre, randomized, double-blind, double dummy, single dose, four way cross-over study investigating the pharmacokinetics and pharmacodynamics of GSK961081 and fluticasone propionate when administered alone, concurrently and as a combination blend in healthy subjects.