If the Metformin isn't working, then your diet and exercise routine need to be revised. I was on Metformin for nearly five years. When the sugar started creeping up, instead of increasing the dosage, trying a new drug, or submitting to insulin injections, I looked even harder for solutions. I found one... better diet, including more fruits and vegetables, and more exercise. I quit taking the Metformin on Dec. 13th and my blood sugar has averaged less than 90 mg/dl ever since. You might want to check out the diabetes info links under my profile.