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Population Pharmacokinetics of Inhaled Umeclidinium and Vilanterol in Patients with Chronic Obstructive Pulmonary Disease

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Abstract

Background and objectives

A fixed-dose combination of the bronchodilators umeclidinium and vilanterol is in development for the long-term, once-daily treatment of chronic obstructive pulmonary disease (COPD). We characterized the pharmacokinetics of umeclidinium and vilanterol in ≈1,635 patients with COPD, evaluating the impact of patient demographics and baseline characteristics on umeclidinium and vilanterol exposure.

Methods

Plasma concentrations of umeclidinium and vilanterol were evaluated in patients enrolled in two phase III, randomized, double-blind, parallel-group, placebo-controlled trials using inhaled umeclidinium/vilanterol combination therapy and inhaled umeclidinium and vilanterol monotherapies as treatments. Population-pharmacokinetic models were developed using non-linear mixed-effects analyses, performed using NONMEM® software. A likelihood-based approach was used to characterize the data below limit of quantification. Umeclidinium and vilanterol exposures at clinical doses were simulated based on the population model.

Results

For the umeclidinium and vilanterol population-pharmacokinetic analyses, 1,635 and 1,637 patients provided 8,498 and 8,405 observations, respectively. Umeclidinium and vilanterol pharmacokinetics were best described by a two-compartment model with first-order absorption. For umeclidinium, bodyweight, age, and creatinine clearance (CLCR) were statistically significant covariates for apparent inhaled clearance (CL/F); bodyweight was a statistically significant covariate for volume of distribution of central compartment (V 2/F).The population parameter estimates namely CL/F and V 2/F for umeclidinium were 218 L/h and 1,160 L and 40.9 L/h and 268 L for vilanterol.

For vilanterol, bodyweight and age were statistically significant covariates for CL/F. The effect of covariates on umeclidinium and vilanterol systemic exposure was marginal. The population model indicates that a 10 % increase in bodyweight will result in a 2 % increase in CL/F for umeclidinium and vilanterol and 6 % increase in umeclidinium V 2/F. A 10 % increase in age will provide a 7 and 4 % decrease in umeclidinium and vilanterol CL/F, respectively. A 10 % decrease in CLCR will result in a 3 % decrease in umeclidinium CL/F. Umeclidinium and vilanterol population-pharmacokinetic model-based systemic exposure predictions showed no pharmacokinetic interactions between umeclidinium and vilanterol when administered in combination.

Conclusions

There were no apparent pharmacokinetic interactions when umeclidinium and vilanterol were co-administered in patients with COPD. The effects of patient demographics, including age, bodyweight, and CLCR, on umeclidinium or vilanterol systemic exposure were minimal, and therefore no dose adjustments are necessary.

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Acknowledgments

Editorial support was provided by Joanne Parker of Fishawack Indicia Ltd, funded by GlaxoSmithKline.

Ethical standards

All patients were required to give written, informed consent. The studies were approved by local review boards/ethics committees and were conducted in accordance with the Declaration of Helsinki and Good Clinical Practice guidelines.

Financial disclosures

This study was funded by GlaxoSmithKline.

Conflict of interest

All authors are employees of GlaxoSmithKline and own stock/stock options in GlaxoSmithKline.

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Correspondence to Navin Goyal.

Additional information

ClinicalTrials.gov identifiers NCT01313637; NCT01313650.

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Goyal, N., Beerahee, M., Kalberg, C. et al. Population Pharmacokinetics of Inhaled Umeclidinium and Vilanterol in Patients with Chronic Obstructive Pulmonary Disease. Clin Pharmacokinet 53, 637–648 (2014). https://doi.org/10.1007/s40262-014-0143-4

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  • DOI: https://doi.org/10.1007/s40262-014-0143-4

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