In the management of alcohol withdrawal, which supplementation should be given before glucose to prevent Wernicke's encephalopathy?

• A. IV thiamine and magnesium
• B. IV calcium and vitamin D
• C. Folic acid and B12
• D. Vitamin C and potassium

Answer: (A)

Thiamine deficiency is common in people with chronic alcohol use, and giving glucose without enough thiamine can precipitate Wernicke's encephalopathy. Thiamine is a crucial cofactor for enzymes that metabolize glucose; when glucose is provided first, the brain’s already-limited thiamine stores are quickly depleted, leading to acute neuro illness. Administering thiamine intravenously before or with glucose ensures the brain has the needed cofactor to properly metabolize glucose and maintain energy production. Magnesium is included because it is a necessary cofactor for thiamine’s activity, and many alcohol-dependent patients are magnesium-deficient, which can blunt the benefits of thiamine. So, IV thiamine (often high-dose) with magnesium before giving glucose prevents this complication. The other options don’t address this specific risk and won’t prevent Wernicke’s in this scenario.