An oral cavity patch comprising: a drug layer and an adhesive layer, wherein the drug layer comprises a drug-release-controlling agent consisting or at least one selected from the group consisting of a hydroxyalkyl alkyl cellulose, hydroxypropyl cellulose, a sodium carboxyalkyl cellulose, ethyl cellulose, hydrogenated castor oil, and a sucrose fatty acid ester.本發明為一種口腔貼附劑，其係具備藥物層與附著層的口腔貼附劑，前述藥物層係含有選自羥烷基烷基纖維素、羥丙基纖維素、羧烷基纖維素鈉、乙基纖維素、硬化蓖麻油及脂肪酸蔗糖酯所成之群中至少1種所構成的藥物釋放控制劑。
