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dc.contributor.authorAssi, Khaled H.*
dc.contributor.authorChrystyn, Henry*
dc.contributor.authorPearson, S.B.*
dc.contributor.authorTarsin, W.*
dc.date.accessioned2009-12-17T13:49:41Z
dc.date.available2009-12-17T13:49:41Z
dc.date.issued2006
dc.identifier.citationAssi, K.H., Chrystyn, H., Pearson, S.B. and Tarsin, W. (2006). Emitted dose estimates from Seretide® Diskus® and Symbicort® Turbuhaler® following inhalation by severe asthmatics. International Journal of Pharmaceutics. Vol. 316, No. 1-2, pp. 131-137.en
dc.identifier.urihttp://hdl.handle.net/10454/4128
dc.descriptionNoen
dc.description.abstractThe dose emitted from dry powder inhalers may be inhalation flow-dependent. Using an ex vivo method, the Electronic Lung¿, we have measured the aerodynamic characteristics of the emitted dose for both active constituents from Seretide® Diskus® (salmeterol xinafoate 50 mcg; fluticasone propionate 500 mcg) and Symbicort® Turbuhaler® (formoterol 6 mcg; budesonide 200 mcg).1 Electronic inhalation profiles were collected from 20 severe asthmatics (mean PEFR 53% predicted) when they inhaled using a placebo Seretide® Diskus® and a placebo Symbicort® Turbuhaler®. These were replayed in the Electronic Lung¿ with the respective active inhaler in situ. Mean(S.D.) peak inhalation flow rates (PIFR) through the Diskus® and Turbuhaler® were 94.7(32.9) and 76.8(26.2) l min¿1, respectively. From the Electronic Lung¿ the Diskus® inhalation profiles provided a mean(S.D.) fine particle dose (FPD) for fluticasone propionate and salmeterol of 20.4(4.8) and 18.4(4.4)% labelled dose. For Turbuhaler® inhalation profiles the FPD was 23.1(12.9) and 20.7(11.1)% labelled dose for budesonide and formoterol, respectively. The linear (p < 0.001) relationships between FPD against PIFR for budesonide and formoterol were 3 (p = 0.002) and 2.8 (p = 0.007) times steeper than fluticasone propionate and salmeterol, respectively. The results highlight a more significant effect of inspiratory flow on variable dosage emission when using the Symbicort® Turbuhaler® compared with the Seretide® Diskus®.en
dc.language.isoenen
dc.relation.isreferencedbyhttp://dx.doi.org/10.1016/j.ijpharm.2006.02.040en
dc.subjectDiskus®en
dc.subjectTurbuhaler®en
dc.subjectElectronic Lung¿en
dc.subjectDoseen
dc.subjectAsthmaen
dc.titleEmitted dose estimates from Seretide® Diskus® and Symbicort® Turbuhaler® following inhalation by severe asthmaticsen
dc.status.refereedYesen
dc.typeArticleen
dc.type.versionNo full-text available in the repositoryen


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