| abstract |
Provided is a methylphenidate patch preparation superior in the stability of a drug (methylphenidate and/or a salt thereof) in the patch preparation, skin permeability of a drug during use of the patch preparation, and methylphenidate availability. A patch preparation having a support and an adhesive layer formed on at least one surface of the support, wherein the adhesive layer contains methylphenidate and/or a salt thereof, polyisobutylene and a liquid plasticizer. The liquid plasticizer preferably has an HLB value of 1.0-3.3. |