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Related Experiment Videos

Do all dry powder inhalers show the same pharmaceutical performance?

A Taylor1, P Gustafsson

  • 1GlaxoSmithKline Research and Development, Harlow, UK. anthony.j.taylor@gsk.com

International Journal of Clinical Practice. Supplement
|November 11, 2005
PubMed
Summary

Dry powder inhaler performance varies significantly. In vitro measures like total emitted dose and fine particle mass show device-dependent differences, potentially impacting patient usability.

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Area of Science:

  • Pharmaceutical science
  • Inhaler technology

Background:

  • Dry powder inhalers (DPIs) are crucial for drug delivery.
  • Key performance metrics include total emitted dose (TED) and fine particle mass (FPM).
  • DPI designs are diverse, leading to varied pharmaceutical performance.

Purpose of the Study:

  • To analyze the variability in in vitro pharmaceutical performance of DPIs.
  • To assess the relationship between in vitro performance and potential in vivo variability.

Main Methods:

  • Review of in vitro studies measuring TED and FPM for various DPIs.
  • Analysis of flow rate sensitivity and inter-device variability in performance metrics.

Main Results:

  • Significant variations in TED and FPM were observed across different DPIs.

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  • In vitro performance metrics demonstrated considerable flow rate sensitivity.
  • High variability in in vitro behavior is likely to translate to variable patient use.

    • Conclusions:

    • In vitro performance of DPIs is highly variable and device-dependent.
    • Variability in TED and FPM suggests potential for inconsistent drug delivery in patients.
    • In vitro characterization is essential for understanding potential in vivo performance challenges.