The doctor is supposed to test your liver enzymes prior to starting Metformin... Since this drug is secreted through the liver, if there are some issues going on there and the enzymes are elevated, the Metformin can cause major health problems, so it is important. My enzymes were slightly elevated, which prevented me from getting on Met for a whole extra year

But I am on it now, and all is well! I would suggest asking your doc if you are concerned. Good luck.