Standard metformin practice is:

GFR 45+. No changes
GfR 30-45. Decrease dose
(but don’t initiate new therapy)
GFR <30. Discontinue

But maybe some low risk patients with CKD IV are losing a benefit by discontinuing their metformin?
Reposted from Stephen Jenkins
We often stop metformin when eGFR < 30 (CKD stage 4). In this observational study of 4,278 patients with type 2 diabetes and CKD stage 4, stopping metformin (40.1% of patients) was associated with lower 3-year survival (63.7% vs 70.5%). Time for an RCT? #MedSky #NephSky www.ajkd.org/article/S027...

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