Answer
Metformin can reduce vitamin B12 levels, particularly with longer exposure or other risk factors. Testing is appropriate if anaemia, neuropathy or other features of deficiency develop.
Sources for this answer
- Competact 15 mg/850 mg film coated tablets — Current selected SmPCemc · Summary of Product Characteristics
- NHSNHS · NHS medicine guidance
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.