Effect of the Moisture Content in Aerosol on the Spray Performance of Stmerin^[○!R] D HFA Preparations

概要

論文の詳細を見る
Stmerin^[〇!R] D, a pressurized metered dose inhaler (MDI) for treatment of asthma, contains CFCs (chlorofluo-rocarbons) as a propellant. For the CFC replacement study, two formulations were prepared using hydrofluo-roalkanes (HFA-134a and HFA-227) and the effect of storage on the spray performance was investigated under accelerated stress conditions. Drug stability, moisture content and spray performances such as the emitted dose uniformity and aerodynamic particle size distribution were evaluated. Drug content did not change after 3 months storage at 40℃/75% RH. However, the emitted dose uniformity varied and the respirable fraction (RF) was reduced remarkably. While stored at 40℃/ambient for 3 months, no change was observed in either drug content or spray performances. This study clarified that the moisture content in the canister played an important role on the spray performance, and it changed not only the emitted dose uniformity but also the particle size distribution. Consequently, in order to improve the stability of the spray performance of aerosol prepared with HFAs, moisture permeation into the canister must be controlled.
公益社団法人日本薬学会の論文
2006-09-01