The invention relates to a salt of 3-methyl-1-phenyl-2-pyrazolin-5-one (edaravone), wherein the salt is 3-methyl-1-phenyl-2-pyrazolin-5-one napadisylate or 3-methyl-1-phenyl-2-pyrazolin-5-one hemi-napadisylate. These napadisylate salts of edaravone are easy to manufacture and dissolve more rapidly in water than the free edaravone base. In addition, the edaravone salts of the present invention are very stable and easy to handle.;The invention also relates to a pharmaceutical composition comprising the aforementioned edaravone salt and to a method of preparing such edaravone salt.
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