Permanently stop taking metformin

This is not the most appropriate response. Metformin remains a foundational therapy for Mr Green, unless there is a persistent contraindication, for example eGFR <30 mL/min/1.73 m², severe hepatic disease, significant hypoxia, or drug intolerance. In Mr. Green’s case the concern is temporary, contrast‑related kidney risk rather than a permanent reason to discontinue. Please reconsider.