Abstract: A method for producing a patch including a support layer and an adhesive layer, comprising the step of forming the adhesive layer with use of an adhesive layer composition obtained by mixing an alkali metal diacetate, a drug, and a nonaqueous adhesive base such that the molar ratio between the drug and the alkali metal diacetate (the number of moles of the drug:the number of moles of the alkali metal diacetate) is from 1:0.5 to 1:15.

Abstract: There is provided a percutaneous absorption preparation that has a simple laminated structure and a long shelf life, while maintaining excellent percutaneous absorption for palonosetron. The percutaneous absorption preparation comprises a support and a drug-containing pressure-sensitive adhesive layer formed on at least one side of the support, wherein the drug-containing pressure-sensitive adhesive layer comprises, as essential constituent components, an adhesive base, palonosetron or a pharmaceutically acceptable acid addition salt thereof, and at least one type of fatty alcohol selected from the group consisting of C6-12 straight-chain saturated alcohols, C10-22 straight-chain unsaturated alcohols, C10-22 branched alcohols and C10-15 cyclic alcohols, and the constituent components other than palonosetron or its pharmaceutically acceptable acid addition salt are carboxyl group-free components.