Disclosed is an adhesive composition for medical use, which contains an acrylic copolymer, a medicament having a carboxyl group, and a base. The acrylic copolymer is obtained by copolymerizing a monomer mixture that contains 0.1-2% by mass of a monomer A which is an ethylenically unsaturated carboxylic acid monomer, 58-99.9% by mass of a monomer B which is an alkyl (meth)acrylate ester having an alkyl group with 4-12 carbon atoms, 30% by mass or less of a monomer C which is an alkyl (meth)acrylate ester having 1-3 carbon atoms, and 30% by mass or less of a monomer D which is a monomer that is different from the monomers A-C and has an ethylenically unsaturated group (provided that the total of the monomers A-D is 100% by mass). The sulfuric acid content in the acrylic copolymer is 700 ppm by mass or less. Consequently, the adhesive composition for medical use has excellent adhesion to the skin, while giving little pain when removed from the skin, and also has excellent stability of the medicament in the adhesive composition.本發明提供一種具有優異之皮膚接著性，並且剝離時之疼痛感較少，而且黏著劑組成物中之藥物之穩定性亦優異的醫療用黏著劑組成物。本發明之醫療用黏著劑組成物包含丙烯酸系共聚物、具有羧基之藥物、及基劑，上述丙烯酸系共聚物係將包含以下單體之單體混合物共聚合而獲得：單體A之乙烯性不飽和羧酸單體0.1～2質量%、單體B之具有碳數為4～12之烷基之(甲基)丙烯酸烷基酯58～99.9質量%、單體C之碳數為1～3之(甲基)丙烯酸烷基酯30質量%以下、及單體D之與上述單體A～C不同的具有乙烯性不飽和基之單體30質量%以下[其中，單體A～D合計為100質量%]；且上述丙烯酸系共聚物中之硫酸含量為700質量ppm以下。
