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Related Experiment Videos

Targeting inhaled steroids.

C Leach1

  • 13M Pharmaceuticals, St Paul, Minnesota, USA.

International Journal of Clinical Practice. Supplement
|May 27, 1999
PubMed
Summary
This summary is machine-generated.

New beclomethasone dipropionate (BDP) inhalers offer improved lung deposition compared to older CFC-BDP metered-dose inhalers (MDIs). These advancements ensure better asthma treatment by delivering medication effectively throughout the airways.

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Area of Science:

  • Pulmonology
  • Pharmacology
  • Drug Delivery Systems

Background:

  • Asthma management requires effective drug delivery to both large and small airways.
  • Chlorofluorocarbon (CFC)-beclomethasone dipropionate (BDP) metered-dose inhalers (MDIs) result in suboptimal lung deposition (<10%), with most of the dose depositing in the oropharynx.
  • Improved inhaler technology is crucial for enhancing therapeutic outcomes in asthma patients.

Purpose of the Study:

  • To evaluate the lung deposition characteristics of a novel hydrofluoroalkane (HFA)-BDP inhaler (Qvar) and its breath-actuated version (Autohaler).
  • To compare the efficacy of new BDP inhaler formulations with traditional CFC-BDP MDIs in delivering medication to the lungs.
  • To assess the potential for reduced oropharyngeal deposition with advanced BDP inhaler technologies.

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Main Methods:

  • Utilized animal and mechanical models to predict lung deposition of HFA-BDP.
  • Conducted clinical studies using radiolabeled Qvar in asthma patients and healthy volunteers.
  • Employed breath-actuated technology in the Autohaler device for optimized drug delivery.
  • Assessed the need for spacer devices with the new inhaler formulations.

Main Results:

  • HFA-BDP inhalers (Qvar) deliver a significantly smaller particle size (approx. 1.1 microns) compared to CFC-BDP MDIs.
  • Predicted and clinically demonstrated lung deposition for HFA-BDP formulations is substantially higher (50-60%) than for CFC-BDP MDIs.
  • The breath-actuated Autohaler achieves lung deposition comparable to an optimally used Qvar MDI.
  • Oropharyngeal deposition was reduced to approximately 30% with HFA-BDP formulations.

Conclusions:

  • Newer HFA-BDP inhaler formulations, including Qvar and the Autohaler, significantly improve lung drug deposition in asthma patients.
  • These advanced inhaler technologies offer a more effective delivery of beclomethasone dipropionate throughout the respiratory tract.
  • The improved deposition characteristics suggest enhanced therapeutic potential for asthma management with these novel devices, potentially reducing reliance on spacers.