Potential risks may include but are not limited to: vasovagal response (passing out), new or increased pain, infection, bleeding, permanent skin changes, allergic or unexpected drug reaction with minor or major consequences, and unintended nerve injury
Seek prompt medical attention if you experience: New or worsening numbness, tingling, or burning sensations in your feet, legs, hands, or arms Sharp, shooting, or electric-shock-like pains, particularly if they interfere with daily activities or sleep Loss of balance, coordination problems, or difficulty walking Muscle weakness or difficulty with fine motor tasks like buttoning clothes Foot injuries or sores that you didn't notice due to reduced sensation Unexplained fatigue, weakness, or cognitive changes that may suggest B12 deficiency Seek immediate medical care (same day/emergency department) for: Rapidly progressive weakness or numbness Marked asymmetry in symptoms (significantly worse on one side) New bladder or bowel dysfunction Signs of foot infection (redness, warmth, swelling, drainage) Foot deformity with warmth and redness (possible Charcot foot) Severe autonomic symptoms (significant blood pressure or heart rate changes) Schedule a routine appointment to discuss: Any subtle changes in sensation, even if mild, to establish baseline documentation Whether you should have vitamin B12 levels checked, especially if you've been on metformin for over a year Symptoms that might indicate B12 deficiency: fatigue, pale skin, shortness of breath, glossitis (inflamed tongue), or memory problems Concerns about medication side effects or questions about continuing metformin therapy Your healthcare provider will conduct a thorough neurologic examination, including assessment of sensation, reflexes, and proprioception
European Journal of Endocrinology , 139 (5), 552561
This is achieved in two key ways
Estimated at 46 hours based on pharmacokinetic modeling
