Patients taking metformin should be instructed to watch for which of the following adverse…

3. How do patients recognize lactic acidosis from metformin?
Watch for increasing shortness of breath, rapid breathing, unusual muscle aches, extreme fatigue, stomach pain, nausea, vomiting, and dizziness. Mental confusion or decreased alertness can occur. These signs suggest metabolic acidosis and require immediate medical attention, blood tests for lactate and pH, and evaluation of kidney function.