My 83 yo grandmother was recently hospitalized for lactic acidosis caused by her Metformin intake. She does not consume alcohol at all but has had mild congestive heart failure for some time (a risk factor for Metformin users in addition to her 80+ age). I'm wondering if anyone has any knowledge or experience with this situation and what medication(s) were prescribed to replace the Metformin in order to manage the underlying Diabetes.