HD is a 56 year old female who has been taking metformin (Gl…

HD is a 56 year old female who has been taking metformin (Glucophage*) 1000mg BID for 2 years for a “prediabetic state”.  She has a history of pancreatitis and family history of medullary thyroid carcinoma.  Despite this therapy, at her last clinic visit her fasting BS is found to be 189 mg/dl and her HgbA1C is found to be 9.2% and asymptomatic.  Considering the patient is unwilling to use insulin (or other injectable medications) and her other risk factors, what would be the best change to make to her medication therapy?