Theophilus, A., Moore, A., Prime, D., Rossomanno, S., Whitcher, B. and Chrystyn, Henry (2006) Co-deposition of salmeterol and fluticasone propionate by a combination inhaler. International Journal of Pharmaceutics, 313. pp. 14-22. ISSN 0378-5173
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The combination of the long-acting β2-agonist, salmeterol xinafoate (salmeterol) and inhaled corticosteroid, fluticasone propionate (FP) (Seretide®/Advair®) has shown enhanced efficacy compared with concurrent administration of the two drugs from individual inhalers at the same dose. A possible explanation for this increased effect is a higher degree of co-deposition of the two drugs from the combination (Seretide) inhaler compared with the component drugs administered separately.
Raman laser spectroscopy, a technique capable of identifying individual drug particles, has been used with novel statistical methodology that we have developed, to determine whether there is any co-association between drug particles and whether this occurs in the Seretide formulation rather than by chance. Samples from a combined Seretide metered dose inhaler (MDI, 25/50 mcg) and salmeterol (25 mcg) with FP (50 mcg) from separate MDI's taken from Plate 4 of an Anderson Cascade Impactor were analysed.
Using a statistical test based on the bootstrap technique, it was found that the co-deposition of FP and salmeterol particles from the combination MDI was significantly greater than from the separate inhalers group (p < 0.001). A higher degree of co-deposition on the same cells of the airways may possibly account for the increased efficacy observed in patients prescribed Seretide MDI.
|Additional Information:||Copyright © 2006 Elsevier B.V. All rights reserved.|
|Uncontrolled Keywords:||Synergy; Salmeterol; Fluticasone propionate; Combination therapy|
|Subjects:||R Medicine > RS Pharmacy and materia medica|
|Schools:||School of Applied Sciences|
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|Depositing User:||Briony Heyhoe|
|Date Deposited:||09 Oct 2007|
|Last Modified:||10 Dec 2016 05:16|
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