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I've never been told what normal ranges are. I take 500mg of Metformin in the morning and one at night. When I eat dinner, i find myself eating more carbs than i should because my testing levels don't get above 150. For instances, i can have a whole baked potato, chicken and veggies and two hours later my testing will only be 140. Seems like it takes me three hours to have it peak. My doctor moved me rom 500mg to 1000mg about a year ago and since then I've lost almost 20 pounds. AIC is 6.3 Can I be taking too much medication?