A patient on metformin with tingling feet – why?
Share what could be the reason and how to manage it.
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Because long-term metformin use can cause vitamin B12 deficiency, leading to peripheral neuropathy and tingling sensations in the feet
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Good insight @alf1ya. Any ideas on how to manage it?
Management includes checking B12 levels and supplementing appropriately.
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Metformin interferes with vitamin B12 absorption in the gut :-low B12 ….nerve damage….. paresthesia.
For precaution,Check serum vitamin B12 level.Give vitamin B12 supplementation (oral or IM).Continue metformin if needed but monitor B12 periodically (especially long-term users).
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Right B12 deficiency
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A known side effect of long term metformin use is Vit B12 deficiency. Metformin interferes with B12 absorption in the gut, which can lead to peripheral neuropathy—manifesting as tingling, numbness, or burning in the extremities like the feet.
Metformin can also trigger via electrolyte imbalance or treatment induced neuropathy. So checking blood levels and supplementing accordingly would be the best management.
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Metformin is well known to interfere with the absorption of Vitamin B12 in the intestine, especially with long-term use. Over time, this reduced absorption can lead to Vitamin B12 deficiency, which may manifest as neurological symptoms such as numbness, tingling sensations (paresthesia), burning feet, fatigue, memory issues, or even peripheral neuropathy. Because these symptoms can sometimes mimic diabetic neuropathy, the deficiency may go unnoticed unless specifically investigated.
Patients who are on metformin for prolonged periods should have their serum Vitamin B12 levels checked periodically, particularly if they show signs of anemia or nerve-related complaints. If levels are low, Vitamin B12 supplementation can be given either orally or through intramuscular injections, depending on severity. Importantly, metformin usually does not need to be discontinued, as its benefits in glycemic control are significant; instead, the focus should be on regular monitoring and timely supplementation to prevent long-term complications.
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Great insight @lakshmi. You’ve highlighted the management well.
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And what do you think will be the management @mehjabeenjaved200?
Excellent @Rituparna25. That is exactly what metformin does, and yes, the management should be symptomatic and not the discontinuation of the drug.
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Metformin causes vitamin B12 deficiency; manage with testing and supplementation.
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Good insight @AmrutaS. You’ve described it in a nutshell.
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due to long term use causes b12 deficiency which leads to peripheral neuropathy
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Good @sanghavideshpande. What might be the management?
supplementation
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Metformin makes interference with vitamin B12 absorption. And lack of B12 causes tingling numbness sensations. Because B12 is responsible for your better nerve conduction and if it’s less it causes paraesthesia.
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Great explanation @Uchi. Do we then require to change the medication? What’s your thoughts?
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I am not from the medicine field; hence, I cannot say about medications, but yeah, we can focus on increasing the dosage of vitamin B12, so I think adding B12 supplements along with folic acid and changes in diet should work. What do you say? Please guide.
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A patient on long-term metformin may develop tingling in the feet due to vitamin B12 deficiency, as metformin reduces intestinal absorption of B12. This deficiency can cause peripheral neuropathy, leading to symptoms such as numbness, tingling, or burning sensation in the feet. Regular monitoring of vitamin B12 levels is therefore recommended in patients taking metformin.