PROBLEM TO BE SOLVED: To provide long-acting osteoclasis inhibitor.SOLUTION: The present invention provides a long-acting/sustained-release osteoclasis inhibitor containing as an active ingredient an aqueous composition comprising a complex of catechins and gelatin as well as water.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2019,JPO&INPIT【課題】持効性骨破壊阻止剤を提供する。【解決手段】カテキン類とゼラチンの複合体及び水を含む水性組成物を有効成分とする持効性/徐放性骨破壊阻止剤。【選択図】図2