Stability of refrigerated miglustat after preparation in InOrpha® flavored suspending excipient for compounding of oral solutions and suspensions
Authors Riahi S, Ambühl M, Stichler J, Bandilla D
Received 17 September 2014
Accepted for publication 10 November 2014
Published 17 January 2015 Volume 2015:9 Pages 561—566
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 3
Editor who approved publication: Professor Shu-Feng Zhou
Sofyen Riahi, Michael Ambühl, Jürgen Stichler, Dirk Bandilla
Actelion Pharmaceuticals Ltd, Allschwil, Switzerland
Background: Miglustat (Zavesca®) is an oral treatment for type 1 Gaucher disease and Niemann–Pick disease type C. Patients with Niemann–Pick disease type C often have difficulties swallowing, and miglustat has an unpleasant taste. The stability of miglustat at 2°C–8°C prepared in InOrpha® suspending vehicle, a liquid taste-masking agent, was assessed.
Methods: The contents of Zavesca® 100 mg capsules (a powder blend comprising miglustat and several excipients) were transferred into InOrpha®. Although miglustat was soluble in InOrpha® at all concentrations tested, some of the excipients were not. An InOrpha® suspension containing 20 mg/mL miglustat was investigated initially. Subsequently, a pH-adjusted suspension of 20 mg/mL, and non-adjusted 10 and 5 mg/mL suspensions were evaluated. All suspensions were stored under refrigerated conditions. Physicochemical and microbiological challenge testing was performed at 0 hours and after 14 and 28 days. Degradation was assessed by high-performance liquid chromatography, appearance was assessed visually, and pH was recorded. Suspensions were inoculated with seven species of bacteria, yeast, and mold, and growth evaluated using membrane filtration.
Results: Miglustat 20 mg/mL suspension changed from yellow (0 hours) to brown (days 14 and 28); pH remained stable at 7.4–7.6. Pure InOrpha® (pH 4.6) remained yellow throughout the study. Pure InOrpha® adjusted to pH 7.5 displayed a brownish discoloration after 9 days. Miglustat 5 and 20 mg/mL suspensions, adjusted to pH 6.5 and 4.4, respectively, remained yellow at days 14 and 28. Miglustat 10 mg/mL suspension (pH 7.3) changed from yellow to brown on day 9. No degradates were detected for any of the concentrations tested. There was no proliferation of microorganisms over the study period; in all cases the level of contamination was clearly reduced.
Conclusion: InOrpha® suspensions containing miglustat 5 mg/mL (without pH adjustment) and 20 mg/mL (with pH adjusted to 4.4) display stable physicochemical and microbiological properties over 28 days.
Keywords: microbiological challenge, Niemann–Pick disease type C, type 1 Gaucher disease
This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution - Non Commercial (unported, v3.0) License. By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms.Download Article [PDF] View Full Text [HTML][Machine readable]