Pharmacology Which of the following characteristics make metformin a preferred biguanide than phenformin ? A It is more potent B It is less liable to cause lactic acidosis C It does not interfere with vitamin B12 absorption D It is not contraindicated in patients with kidney disease 💡 Explanation Which of the following characteristics make metformin a preferred biguanide than phenformin ? ✓ Correct Answer: B. It is less liable to cause lactic acidosis