The Comparative Bioavailability of Fluticasone and Azelastine Delivered as a Single Fixed Dose Combination

Objective: Two studies (Study I and Study II) were conducted in healthy Chinese volunteers to confirm that there was no pharmacokinetic drug interaction between AZE and FLU in MP-AzeFlu. The secondary objective was to evaluate the pharmacokinetic parameters of MP-AzeFlu compared with the commercially available mono-components. Methods: Both studies were a randomized, open-label, three-period, six-sequence, single-dose cross-over trial (William's design) conducted at Beijing Hospital (Beijing, China) in September and October of 2019 in 30 healthy adult male and female volunteers. The natural log transformed parameters: [AUC.sub.0-tlast], [AUC.sub.0-[infinity]] and [C.sub.max] were analyzed. Results: The comparison of PK parameters between MP-AzeFlu and Aze (commercially available) showed that the LS mean ratios (90% CI) values for, [AUC.sub.0-tlast], [AUC.sub.0-[infinity]] and [C.sub.max] were 100.29% (94.31-106.66%), 100.76% (94.60-107.32%) and 93.14% (81.47-106.48%). The comparison of PK parameters between MP-AzeFlu and Flu (commercially available) for the bioavailability evaluation showed that the LS mean ratios (90% CI) values for, [AUC.sub.0-tlast], [AUC.sub.0-[infinity]] and [C.sub.max] were 83.48% (69.81-99.82%), 100.19% (87.34-114.94%) and 81.91% (68.50-97.95%). Conclusion: The study results confirm that neither the FLU or the AZE component in the combination product (MP-AzeFlu), nor the existing qualitative and quantitative differences in the formulation between the currently marketed AZE and FLU mono-product, display significant potential to impact the systemic exposure of AZE or FLU in Chinese subjects. Keywords: MP-AzeFlu, azelastine, fluticasone, allergic rhinitis, pharmacokinetics