I had various bowel problems while on it, which were slightly unusual and hard to relate back to taking metformin, but they all cleared up when I stopped taking

I had various bowel problems while on it, which were slightly unusual and hard to relate back to taking metformin, but they all cleared up when I stopped taking it. It's a very well-known drug, and a lot of patients have taken it for a long time. Side-effects are rare.