Multi-breath dry powder inhaler for delivery of cohesive powders in the treatment of bronchiectasis

Paul M. Young, Rania O. Salama, Bing Zhu, Gary Phillips, John Crapper, Hak-Kim Chan, Daniela Traini

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


A series of co-engineered macrolide–mannitol particles were successfully prepared using azithromycin (AZ) as a model drug. The formulation was designed to target local inflammation and bacterial colonization, via the macrolide component, while the mannitol acted as mucolytic and taste-masking agent. The engineered particles were evaluated in terms of their physico-chemical properties and aerosol performance when delivered via a novel high-payload dry powder Orbital™ inhaler device that operates via multiple inhalation manoeuvres. All formulations prepared were of suitable size for inhalation drug delivery and contained a mixture of amorphous AZ with crystalline mannitol. A co-spray dried formulation containing 200 mg of 50:50 w/w AZ: mannitol had 57.6% ± 7.6% delivery efficiency with a fine particle fraction (≤6.8 µm) of the emitted aerosol cloud being 80.4% ± 1.1%, with minimal throat deposition (5.3 ± 0.9%). Subsequently, it can be concluded that the use of this device in combination with the co-engineered macrolide–mannitol therapy may provide a means of treating bronchiectasis.
Original languageEnglish
Pages (from-to)859-865
Number of pages7
JournalDrug Development and Industrial Pharmacy
Issue number5
Publication statusPublished - 2015
Externally publishedYes


  • Bronchiectasis
  • dry powder inhaler
  • inhalation
  • macrolides
  • mucolytics
  • orbital


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