The purpose of the present invention is to provide a slow-releasable, non-aqueous skin patch composition of favorable adhesive strength. The addition of a powder component (a filler or the like) allows this skin patch to achieve improved adhesive strength of the skin patch and improved release of the drug. As a result, the adhesive strength of the skin patch is maintained for a long time, thereby making it possible to improve percutaneous absorption and enable slow release. The use of the skin patch composition containing this powder component causes a drug, regardless of the type of drug, to be dissolved into an organic solvent or ionic liquid and to be incorporated into the non-aqueous skin patch as a principal drug solution along with the organic solvent, thereby realizing a preparation of both improved percutaneous absorption and improved slow release.
