Disclosed is a medicinal composition for iontophoresis, in which a medicinal agent has excellent stability, and which can be prepared and filled readily in the production process and can be produced at low cost. The medicinal composition for iontophoresis is characterized by comprising a nonionic synthetic polymer, betamethasone sodium phosphate, and a solvent. A preferred embodiment of the medicinal composition is characterized in that the nonionic synthetic polymer substance is polyvinyl alcohol (PVA). A preferred embodiment of the medicinal composition is characterized in that the content of polyvinyl alcohol (PVA) is 0.5 to 30 wt%.
