PROBLEM TO BE SOLVED: To provide a pharmaceutical aerosol formulation for use in a pressurized metered dose inhaler (abbreviated as pMDI or MDI), particularly an improved pharmaceutical aerosol formulation for aerosol administration.SOLUTION: The present invention provides a pharmaceutical aerosol suspension formulation for MDI administration, comprising: (a) an atomization β2-stimulant, (b) micronized corticosteroid, (c) a quasi-therapeutic amount of a moisture scavenging excipient, and (d) an HFA propellant. The (a), (b) and (c) and their respective relevant amounts are selected such that they associate to form fluorocarbon having substantially the same density as that of the HFA (hydrofluoroalkane) propellant.SELECTED DRAWING: NoneCOPYRIGHT: (C)2020,JPO&INPIT【課題】加圧定量吸入器(pMDIまたはMDIと略記)に使用するための医薬エアゾール製剤、特にエアゾール投与用の改善された医薬エアゾール製剤に関する。【解決手段】a)微粒化β2-刺激薬、b)微粒化コルチコステロイド、c)準治療量の水分捕捉賦形剤およびd)HFA噴射剤を含み、ここで(a)、(b)および(c)ならびにその各々の相対量は、これらが会合してHFA(ハイドロフルオロアルカン)噴射剤のものと実質的に同じ密度を有するフロキュールを形成するように選択されるMDI投与用医薬エアゾール懸濁液製剤の提供。【選択図】なし