Metformin use is not associated with B12deficiency or neuropathy in patients with type 2 diabetes Mellitus in Qatar
Peripheral Nervous System Diseases
© 2018 Elhadd, Ponirakis, Dabbous, Siddique, Chinnaiyan and Malik. Background: Metformin may lead to B 12 deficiency and neuropathy. There are no published data on the prevalence of Metformin-related B 12 deficiency and neuropathy in the Arabian Gulf. Aims: Determine whether Metformin intake is associated with B 12 deficiency and whether B 12 deficiency is associated with diabetic peripheral neuropathy (DPN) and painful diabetic neuropathy. Methods: Patients with type 2 diabetes mellitus (T2DM) (n = 362) attending outpatient clinics at HMC underwent assessment of B 12 levels, the DN4 questionnaire, and vibration perception threshold (VPT). Results: Comparing Metformin to non-Metformin users there were no differences in B 12 levels, VPT, or DN4. The prevalence of B 12 deficiency (B 12 < 133 pmol/l) was lower (P < 0.01) in Metformin (8%) compared to non-Metformin (19%) users. Patients with B 12 deficiency had a comparable prevalence and severity of sensory neuropathy and painful neuropathy to patients without B 12 deficiency. Conclusion: Serum B 12 levels were comparable between Metformin and non-Metformin users with T2DM in Qatar. T2DM patients on Metformin had a lower prevalence of B 12 deficiency. Furthermore, the prevalence and severity of neuropathy and painful diabetic neuropathy were comparable between patients with and without B 12 deficiency.
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