When should metformin be held prior to surgery?

When should metformin be held prior to surgery?

• A. Day before
• B. Day of
• C. 1 week before
• D. Day after

Answer: (D)

The key idea is managing metformin to prevent lactic acidosis in the perioperative period. Metformin is cleared by the kidneys, and after surgery kidney function and perfusion can be temporarily impaired. The safest approach in this scenario is to withhold metformin after the operation, not beforehand, so you avoid continued drug accumulation during the immediate postoperative period when renal function may be uncertain. You can restart metformin once renal function is stable and the patient can take oral medications reliably. So, holding it after the procedure aligns with minimizing risk during a time of potential postoperative renal impairment, rather than interrupting it before surgery or unnecessarily extending the hold far in advance.

The key idea is managing metformin to prevent lactic acidosis in the perioperative period. Metformin is cleared by the kidneys, and after surgery kidney function and perfusion can be temporarily impaired. The safest approach in this scenario is to withhold metformin after the operation, not beforehand, so you avoid continued drug accumulation during the immediate postoperative period when renal function may be uncertain. You can restart metformin once renal function is stable and the patient can take oral medications reliably.

So, holding it after the procedure aligns with minimizing risk during a time of potential postoperative renal impairment, rather than interrupting it before surgery or unnecessarily extending the hold far in advance.