My surgery was 10/13/2008. Before surgery I was taking 2000mg of metformin a day along with two 10mg of byetta shots a day. Before surgery, my doctor took me off the byetta. After surgery, I went down to 1000mg of metformin a day. Just went to my diabetes doctor and my diabetes is under control. She is putting me on 500mg time released per day and does not want to see me for six months. Hopefully by then, she will take me off all medicine. Just listen to your doctor. He will do what is right for you.