ACE and Hypermagnesemia: Therefore, in patients taking ACE‐I, ARB, or NSAIDs, mildly lowered blood pressure at a systolic blood pressure of approximately 100–115 mmHg needs to be carefully monitored so as not to lead to AKI.19 Elderly people are at risk for developing AKI,20 including normotensive ischemic AKI.19 In this study, even among elderly people without a significant increase in the serum Cre base values, at ≤2.00 mg/dL, and taking regular doses of MgO, all patients had AKI as a complication and presented with hypermagnesemia.