PROBLEM TO BE SOLVED: To obtain an external composition that has improved solubility of aciclovir and improved absorption of aciclovir into mucous membrane and skin.SOLUTION: This water-soluble external composition includes aciclovir in an amount more than the saturation concentration at ordinary temperature as well as at least one selected from the group consisting of naphazoline hydrochloride tetracaine hydrochloride benzyl alcohol caffeine diphenhydramine hydrochloride pyridoxine hydrochlorid...

PROBLEM TO BE SOLVED: To obtain an external composition that has improved solubility of aciclovir and improved absorption of aciclovir into mucous membrane and skin. SOLUTION: This water-soluble external composition includes aciclovir in an amount more than the saturation concentration at ordinary temperature as well as at least one selected from the group consisting of naphazoline hydrochloride tetracaine hydrochloride benzyl alcohol caffeine diphenhydramine hydrochloride pyridoxine hydrochlor...