A nurse is reviewing the medication list of a client with type 2 diabetes who has recently been diagnosed with stage 1 renal failure. The client is currently prescribed the biguanide medication, metformin. What is the most appropriate nursing action regarding metformin therapy for this client?

A. Advise the client to monitor blood glucose more frequently but continue metformin as prescribed: While monitoring blood glucose is important, continuing metformin in the presence of renal impairment can increase the risk of lactic acidosis. Dose adjustment or discontinuation may be required based on kidney function. B. Suggest administering metformin with meals to reduce gastrointestinal side effects and continue therapy: Taking metformin with meals may reduce GI upset, but it does not address the serious risk of lactic acidosis in clients with renal impairment. This intervention alone is insufficient for patient safety. C. Notify the provider to consider discontinuing metformin due to the risk of lactic acidosis from renal impairment: Metformin is contraindicated or used with caution in clients with reduced kidney function because impaired renal clearance increases the risk of lactic acidosis, a rare but potentially fatal adverse effect. Prompt communication with the provider is the safest action. D. Encourage the client to increase fluid intake to enhance metformin clearance: Increasing fluids does not significantly reduce the risk of lactic acidosis in renal impairment. Kidney function, not hydration status, primarily determines metformin clearance, making this action insufficient.