PROBLEM TO BE SOLVED: To provide inhalation powder of benz [d] [1,3] oxazine-derivative maleate which is excellent in inhalation characteristics.SOLUTION: The invention provides a formulation for inhalation containing benz [d] [1,3] oxazine-derivative maleate, where the active ingredient concerned is a crystal which has a characteristic peak of 8.4° as an angle of diffraction (2θ±0.5°) in X-ray power diffraction, the crystal having a characteristic peak of 7.7° is an active ingredient which is not contained substantially, and a 10% accumulation particle diameter of the carrier particles concerned is 20 μm or more.COPYRIGHT: (C)2015,JPO&INPIT【課題】吸入特性の優れたベンズ[d][1,3]オキサジン誘導体マレイン酸塩の吸入粉末剤を提供する。【解決手段】ベンズ[d][1,3]オキサジン誘導体マレイン酸塩を含有する吸入用製剤であって、当該有効成分が、粉末X線回折において、回折角(2θ±0.5°)として、8.4°に特徴的なピークを有する結晶であり、7.7°に特徴的なピークを有する結晶は実質的に含まない有効成分であり、当該担体粒子の累積10%粒子径が20μm以上である、吸入粉末剤。【選択図】図6
