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Metformin contrast procedure — GPhC CRA MCQ

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ModerateRenal and Hepatic ImpairmentMetformin contrast procedureGPhC CRA

A patient taking metformin is due to have contrast imaging and has chronic kidney disease. He asks whether his diabetes tablets need changing. What is the most appropriate action?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: B — Advise him to follow the imaging unit plan and ensure renal function guidance for metformin is checked

Metformin management around iodinated contrast depends on renal function, contrast route and local protocol. The key safety issue is kidney function deterioration and lactic acidosis risk. The patient should follow the imaging unit or prescriber plan, and the pharmacist should help clarify if absent. Independent substitution is not appropriate.

Reference: BNF; local renal guidance