Your creatinine level has increased slightly, indicating a mild change in kidney function. Because metformin is processed by the kidneys, we monitor this closely. A creatinine of 1.3 mg/dL is often still safe for metformin, but doctors use this value to calculate your eGFR (estimated Glomerular Filtration Rate), which is a more accurate measure of kidney health. It is generally safe to continue your current dose for now. However, please consult your prescribing doctor soon. They will calculate your eGFR to confirm if 1500 mg daily remains safe or if a minor dose adjustment is needed. Do not stop taking your medication without their guidance.