Blonanserin-containing patch preparation

A patch preparation containing a support and an adhesive layer formed on one surface of the support, wherein the adhesive layer contains 2-(4-ethyl-1-piperazinyl)-4-(4-fluorophenyl) -5,6,7,8,9,10-hexahydrocycloocta[b]pyridine or a physiologically acceptable acid addition salt thereof, an acrylic polymer, lactic acid, sesame oil and one or more kinds of stabilizers selected from 2-mercaptobenzimidazole, 2,6-di-tert -butyl-4-methylphenol and propyl gallate. A patch preparation containing a support and an adhesive layer containing lactic acid and magnesium aluminometasilicate and formed on at least one surface of the support, which preparation is superior in both skin permeability and adhesiveness in the presence of water.