The present invention is directed to crystalline addition salts of (i) 8-hydroxyquinolin-2(1H)-one derivatives and (ii) a hydroxycarboxylic acid, a sulfonic acid or a sulfimide, or a pharmaceutically acceptable solvates thereof.本發明針對(i)8-羥基喹啉-2(1H)-酮衍生物和(ii)羥基羧酸、磺酸或磺醯亞胺之結晶加成鹽類,或其醫藥上可接受之溶劑化物。