Metformin didn't really do anything for me weight loss-wise, either. I did lose about 25 pounds after switching out Zyprexa for Geodon about a year and a half ago, but have gained most of them back because I had to go back on the Zyprexa after all. I take the metformin for diabetes too.....I was diagnosed with DM the year before I was diagnosed with BP. Two devastating diagnoses almost exactly one year apart.