to shorten the story, I have diabetes and am taking Glumetza, the brand name of metformin. Last year I was taking the generic metformin. I had 3 months of abdominal pain ,nausea, and diarrhea. Which I found out was from the generic. I have had no problems with the brand Glumetza..Just a heads up on ths possible side effects. It's great that this may be another treatment for cancer.