Pharmacokinetics of chlorofluorocarbon and hydrofluoroalkane metered-dose inhaler formulations of beclomethasone dipropionate

B J Lipworth, C M Jackson

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31 Citations (Scopus)


Aims To compare the pharmacokinetic profile of Beclazone(TM) (beclomethasone dipropionate) in its chlorofluorocarbon (CFC)-based and CFC-free formulations.

Methods Ten healthy adults received a single 1000 mu g nominal dose (ex-valve) of beclomethasone dipropionate from a CFC inhaler (BEC-CFC) or from a CFC-free inhaler containing hydrofluoroalkane (HFA)-134a (BEC-HFA) in an open-label, randomized, two-way, crossover study. Blood samples were collected predose and over 12 h after inhalation. Comparisons were made of maximum plasma concentration of beclomethasone 17-monopropionate (17-BMP) (C-max ), and area under the plasma concentration vs time curve (AUC).

Results The t(max) was significantly (P < 0.05) earlier with BEC-HFA and plasma levels were significantly higher following administration of BEC-HFA than BEC-CFC. Geometric mean values for AUC were 1.5 fold greater (90% CI 1.3-1.9) and for C-max were 1.9 fold greater (90% CI 1.6-2.6) following BEC-HFA than BEC-CFC.

Conclusions Our data in healthy volunteers would not be consistent with the manufacturers' recommendation for a microgram equivalent (1:1) nominal dose switch between these HFA and CFC formulations. Further well designed trials are required in asthmatic patients to properly define their respective dose-response relationships for antiasthmatic and systemic adverse effects.

Original languageEnglish
Pages (from-to)866-868
Number of pages3
JournalBritish Journal of Clinical Pharmacology
Issue number6
Publication statusPublished - 1999


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