• L Malet, L Dayot, M Moussy, B de la Gastine, and S Goutelle.
• Service de pharmacie, hospices civils de Lyon, groupement hospitalier Nord, hôpital Pierre Garraud, 136, rue du Commandant-Charcot, 69005 Lyon, France.
• Rev Med Interne. 2020 Feb 1; 41 (2): 126-129.

IntroductionVitamin B6 is contained in a number of over-the-counter drugs and vitamin supplements. It may cause severe neurological troubles in case of overdosage.Case ReportWe report the case of a 92-year-old women with gait disorders. A diagnosis of peripheral neuropathy with both motor and sensitive deficits was established and investigated. Blood level of vitamin B6 was measured to investigate a potential deficiency. Unexpectedly, the results showed hypervitaminosis B6, which appears to be due to self-administration of an over-the-counter drug containing vitamin B6. Discontinuation of this drug was associated with decrease in vitamin B6 level as well as gait improvement. We also discuss the toxicity of vitamin B6.ConclusionHypervitaminosis B6 remains a possible cause of peripheral neuropathy and it may be caused by self-administration of over-the-counter vitamin-containing drugs.Copyright © 2019 Société Nationale Française de Médecine Interne (SNFMI). Published by Elsevier Masson SAS. All rights reserved.

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