PROBLEM TO BE SOLVED: To provide methods for treating hyperglycemia such as diabetes mellitus.SOLUTION: The present invention provides use of (R)-(+)-verapamil or a pharmaceutically acceptable salt thereof to produce agents for treating diabetes mellitus and/or disorders related to diabetes mellitus.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2020,JPO&INPIT【課題】真性糖尿病などの高血糖症を処置する方法の提供。【解決手段】真性糖尿病および/または真性糖尿病に関係する障害の処置のための薬物を製造するための、(R)-(+)-ベラパミルまたはその薬学的に許容できる塩の使用。【選択図】図3