PURPOSE: To obtain a safe and uniform sustained-release drug composition of mucosa application type by gelatinizing a viscous emulsion comprising a combination of a specific fatty acid, benzyl alcohol, octyl dodecanol, etc., polyvinyl alcohol, cationic drug and water.

CONSTITUTION: A uniform viscous emulsion comprising one or a combination of two or more selected from 10-20C fatty acids (e.g. isostearic acid, oleic acid, myristic acid or stearic acid), benzyl alcohol, octyl dodecanol and oleyl alcohol, polyvinyl alcohol, a cationic drug (e.g. pranoprofen, tiaramide chloride or fentanyl citrate) and water is packed into a shaping mold, frozen, thawed and gelatinized to give a drug composition.