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Metformin and Glucose Levels

To E.W., Arley, Alabama:

The hemoglobin A1c level indicates a person’s average blood glucose over the prior three months. It is a better measure of glucose control than a finger stick test that measures glucose at one specific time. In general, taking metformin lowers one’s A1c level. A desirable A1c reading is less than 7 percent. An A1c of 9 percent indicates the average blood sugar level is 240 Side effects of metformin may include GI upset, headache, and weakness. Patients with kidney, liver, or heart problems may experience a rare but serious condition called lactic acidosis.

Controlling your blood sugar is important. I would not recommend stopping your medication without further conversation with your doctor.

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