This invention provides a budesonide/formoterol dry powder inhaler comprising: a reservoir containing a dry powder medicament and an arrangement for delivering a metered dose of the medicament from the reservoir； a cyclone deagglomerator for breaking up agglomerates of the dry powder medicament； a delivery passageway for directing an inhalation-induced air flow through a mouthpiece, the delivery passageway extending to the metered dose of medicament, wherein the medicament comprises micronised formoterol fumarate, micronised budesonide and a lactose carrier, the lactose carrier having a particle size distribution of d10 = 20-65 μm, d50 = 80-120 μm, d90 = 130-180 μm and <；10 μm = <；10%.本發明提供一種布地奈德(budesonide)/福莫特羅(formoterol)乾燥粉末吸入器，其包括：裝納乾燥粉末藥劑之貯集槽及用於自該貯集槽傳遞計量劑量之藥劑之配置；用於粉碎乾燥粉末藥劑之聚結物之旋風解黏聚器；用於導引吸入誘導的氣流通過吹嘴之傳遞通道，該傳遞通道係延伸至計量劑量之藥劑，其中該藥劑包含微粒化富馬酸福莫特羅、微粒化布地奈德及乳糖載體，該乳糖載體具有d10=20至65μm、d50=80至120μm、d90=130至180μm及<；10μm=<；10%之粒度分佈。
