The present invention provides a gel patch comprising a base fabric, an adhesive layer, and a release liner in this order, wherein the adhesive layer contains a physiologically active substance, a water-soluble (meth)acrylic polymer, water, a surfactant, and poly(methyl acrylate/2-ethylhexyl acrylate), and the surfactant comprises a polyethylene glycol fatty acid ester or a polyoxyethylene sorbitan fatty acid ester.本發明提供一種膏劑，其係依序具備基布、膏體層及剝離襯墊之膏劑，上述膏體層含有生理活性物質、(甲基)丙烯酸聚合物、水、界面活性劑及聚(丙烯酸甲酯/丙烯酸2-乙基己酯)，上述界面活性劑包含聚乙二醇脂肪酸酯或聚氧乙烯山梨糖醇酐脂肪酸酯。
