I am currently taking Metformin as I have almost completely tapered off my Quetiapine. I hate to think this drug has given me diabetes the rest of my life. My regular doctor said nothing about my high blood sugar. My Psychiatrist put me on Quetiapine for sleep never mentioned the risk of high blood sugar. When I told him my sugar levels he said to start immediately tapering a 100mg a week until off completely. He stated the quetiapine would try to defeat the effects of the metformin. Any comments will be appreciated.