Title:Efficiency of a Lyophilizate for Dry Powder Inhalation System for Drug
Delivery of Ghrelin in Monkeys
Volume: 14
Issue: 1
Author(s): Tomomi Akita*, Kahori Miyamoto and Chikamasa Yamashita*
Affiliation:
- Department of Pharmaceutics and Drug Delivery, Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641, Yamazaki, Noda, Chiba 278-8510, Japan
- Department of Pharmaceutics and Drug Delivery, Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641, Yamazaki, Noda, Chiba 278-8510, Japan
Keywords:
Dry powder inhalation, bioavailability, transpulmonary drug delivery, ghrelin, monkey, pharmacokinetics.
Abstract:
Background: A lyophilizate for dry powder inhalation (LDPI) system is unique in that
its formulation, a lyophilized cake, is aerosolized just upon inhalation by convection flow of air.
An LDPI system may be advantageous, especially for biopharmaceutics, such as proteins and
peptides, because formulations can be manufactured without high temperature and shear stress. It
was already reported that formulations of peptides used in an LDPI system showed high aerosolization
performance. However, it was not confirmed whether the LDPI system could deliver drugs
efficiently enough for practical use.
Objective: In this study, we compared the drug delivery efficiency of an LDPI system with intravenous
and subcutaneous injections.
Methods: We administered LDPI formulations containing ghrelin as model formulations to monkeys
and measured pharmacokinetic profiles.
Results: As a result of pharmacokinetics testing in the monkeys, the bioavailability of an inhaled
drug was 5-15%.
Conclusion: It is expected that the LDPI system can deliver drugs efficiently enough for practical
use even in the systemic application of bio-pharmaceutics.