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Thank you for waiting. You are correct, there are so many different diabetes medications and many do not cause the blood sugar to go too low. If your dad's diabetes has been well controlled, there is no reason to change him from Metformin (that is an excellent medication and all other medications also have possible side effects), but the question is, does he really have lactic acidosis? Normally lactic acidosis would cause nausea, vomiting, muscle weakness and rapid breathing, and you have mentioned none of those symptoms. Chills could be completely unrelated.
If this was my dad I would wait and see what the blood work shows before deciding to change medications while monitoring your dad to make sure he does not get worse with any symptoms.
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