An inhalable powder composition comprises a) an antagonist antibody that binds to human IL-13, b) leucine and c) trehalose. The antibody may include a heavy chain, the variable region of the heavy chain includes a sequence represented by SEQ ID NO: 3 and a light chain, and the variable region of the light chain includes a sequence represented by SEQ ID NO: 1. . Also described is the use of such compositions in the treatment of asthma, as well as inhalers containing such compositions.吸入可能な粉末組成物が、ａ）ヒトＩＬ－１３に結合するアンタゴニスト抗体、ｂ）ロイシン及びｃ）トレハロースを含む。前記抗体が重鎖を含んでいてもよく、前記重鎖の可変領域が配列番号３に示される配列及び軽鎖を含んでおり、前記軽鎖の可変領域が配列番号１に示される配列を含む。喘息の治療におけるそのような組成物の使用、並びにそのような組成物を含む吸入器もまた記載されている。
