| abstract |
An aqueous solution containing a pyrazolone derivative or a physiologically acceptable salt thereof, or a hydrate or solvate thereof as an active ingredient, which is stable and suppresses the formation of impurities when stored for a long period of time. To provide an aqueous solution. An aqueous solution containing a pyrazolone derivative or a physiologically acceptable salt thereof, or a hydrate or solvate thereof, an alcohol, and a compound that generates bisulfite ion in an aqueous solution. [Selection figure] None |