A 68-year-old diabetic patient on metformin develops acute kidney injury (eGFR 28 mL/min/1.73m²). What is the recommended action?
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A
Reduce metformin dose by 50%
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B
Continue metformin with increased monitoring
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C
Discontinue metformin due to lactic acidosis risk
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D
Switch to insulin only if eGFR falls below 15