The invention provides a transdermal absorption preparation which can realize a constant absorption of drugs, such as imidafenacin and silodosin, via skin.The transdermal absorption preparation of the invention comprises drugs, such as imidafenacin and silodosin； transdermal absorption promoter； and fatty acid ester and/or fatty acid amide for enhancing the efficiency of the transdermal absorption promoter.本發明係提供一種經皮吸收型製劑，該製劑能夠實現透過皮膚安定地吸收咪達那新(imidafenacin)或賽洛多辛(silodosin)等藥物。本發明是在含有咪達那新或賽洛多辛等藥物的經皮吸收型製劑中，含有經皮吸收促進劑，並進而含有脂肪酸酯及/或脂肪酸醯胺，該脂肪酸酯及/或脂肪酸醯胺，使經皮吸收促進劑之機能更加提升。
