PROBLEM TO BE SOLVED : To provide a drug which is highly stable and which contains a pyrazolone derivative such as edaravone, but does not contain sodium bisulfite. SOLUTION : The present invention provides a drug which is deoxygenated and which contains (a) a pyrazolone derivative such as 3-methyl-1-phenyl-2-pyrazolin-5-one, (b) a glutathione, and (c) an aqueous solvent, but does not contain sulfites, bisulfites, or pyrosulfites. SELECTED DRAWING : None COPYRIGHT : (C)2019, JPO&INPIT