A 40 year old man presents to casualty with history of regular and heavy use of alcohol for 10 years and morning drinking for 1 year. The last alcohol intake was 3 days back. There is no history of head injury or seizures. On examination, there is no icterus, sign of hepatic encephalopathy or focal neurological sign. The patient had coarse tremors, visual hallucinations and had disorientation to time. Which of the following is the best medicine to be prescribed for such a patient?

**Core Concept**
Wernicke's encephalopathy is a serious condition caused by thiamine (vitamin B1) deficiency, often associated with chronic alcohol abuse. It presents with classic triad of confusion, ataxia, and ophthalmoplegia. The patient's symptoms of disorientation, coarse tremors, and visual hallucinations are suggestive of Wernicke's encephalopathy.

**Why the Correct Answer is Right**
The patient's history of chronic alcohol use and morning drinking for 1 year indicates a high risk of thiamine deficiency. The symptoms of disorientation, coarse tremors, and visual hallucinations are classic for Wernicke's encephalopathy. Thiamine supplementation is essential to prevent progression to Korsakoff's psychosis. Thiamine helps in stabilizing the neuronal membranes and maintaining the electrolyte balance.

**Why Each Wrong Option is Incorrect**
**Option A:** Benzodiazepines are not the first-line treatment for Wernicke's encephalopathy, as they can exacerbate the condition by depressing the respiratory center and worsening the encephalopathy.

**Option B:** Haloperidol is a typical antipsychotic that can worsen the symptoms of Wernicke's encephalopathy due to its potential to cause extrapyramidal side effects and worsening of the confusion.

**Option C:** There is no evidence to suggest that this patient has a seizure disorder, and antiepileptics are not indicated as a first-line treatment for Wernicke's encephalopathy.

**Option D:** This option is not relevant to the treatment of Wernicke's encephalopathy.

**Clinical Pearl / High-Yield Fact**
Wernicke's encephalopathy is a medical emergency requiring immediate treatment with thiamine. Delay in treatment can lead to severe consequences, including Korsakoff's psychosis and death.

**Correct Answer:** B. Thiamine

✓ Correct Answer: C. Diazepam & thiamine