PROBLEM TO BE SOLVED: To provide an ALS treating agent having an excellent treating effect on ALS.SOLUTION: The treating agent for amyotrophic lateral sclerosis has tetrathiomolybdic acid or its salt as an active ingredient. This agent is orally administered.COPYRIGHT: (C)2008,JPO&INPIT【課題】より優れたALS治療薬の提供。【解決手段】テトラチオモリブデン酸又はその塩を有効成分とする筋萎縮性側索硬化症治療薬。【選択図】なし