Single Dose Pharmacokinetics of Intranasal Azelastine Delivered by a Fixed Combination With Fluticasone in Comparison to Azelastine Nasal Sprays Single-centre, Randomised, Open-label, Three-period, Six-sequence Cross-over Trial (William's Design)

The primary objective is to assess the effect of fluticasone propionate (FLU) on the relative bioavailability (AUC0-∞) of azelastine hydrochloride (AZE) when administered as fixed AZE-FLU combination product (TEST) compared to a similar formulation without containing FLU (i.e. AZE alone; REF). The secondary objectives are to compare the relative bioavailability (AUC0-∞) of AZE when administered either as fixed AZE-FLU combination product (TEST) or as marketed AZE product Astelin® Nasal Spray (COMP); To compare the effects of FLU on other pharmacokinetic parameters of AZE (AUC0-tlast, CL/f, Cmax, tmax, t½); To assess adverse events.