Normal Range
I believe that the maximum dosage of Metformin is 2000 mg per day.
If you think that you are taking too much Metformin, you should consult your doctor. You should strive to keep your blood sugar in the neighborhood of 100 mg/dl during the day. It appears that you may be eating too many carbs. Read the first three threads in the Type 2 Section when you get a chance, they may help you a lot.