A patient with T2DM and an eGFR of 38 mL/min/1.73m² is currently on metformin 1000 mg twice daily. What is the most appropriate action?
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A
Continue metformin at current dose
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B
Reduce metformin dose to 500 mg twice daily
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C
Discontinue metformin
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D
Switch to metformin XR 2000 mg daily