Key result
Metformin can be safely continued perioperatively for minor surgeries in patients with normal kidney function, but should be discontinued for 48 hours in doubtful situations or major surgeries.
Why the study?
Should metformin be discontinued before general anesthesia in patients with type 2 diabetes?
Should metformin be discontinued before general anesthesia in patients with type 2 diabetes?
There is a need to standardize recommendations for perioperative metformin management to balance the rare risk of metabolic acidosis with optimal glycemic control.
Inconsistent perioperative metformin guidelines persist; leaves open need for standardized protocols from higher-level evidence.
Metformin is one of the main medications in the treatment of type 2 diabetes. Despite its widespread use, there are controversies surrounding the continuation of therapy with this drug during the perioperative period, mainly due to the risk of metabolic acidosis. The likelihood of developing metabolic acidosis associated with the use of metformin is very rare, but it increases in patients with impaired kidney function as well as in conditions of hypoperfusion and hypoxia. There are differences between various recommendations regarding the use of metformin during the perioperative period. The widespread use of the drug, coupled with the lack of consistency in recommendations, should encourage efforts to standardise them, particularly for optimal metabolic control of surgical patients.
No takes yet. Share an insight, caveat, or question.
Dariusz Tomaszewski (2025) conducted a review in Type 2 diabetes requiring general anesthesia. Metformin was evaluated. Metformin can be safely continued perioperatively for minor surgeries in patients with normal kidney function, but should be discontinued for 48 hours in doubtful situations or major surgeries.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: