**Question:** Which of the following drugs reduces alcohol craving and chances of resumed heavy drinking by alcoholics after they have undergone a detoxification programme with this drug?

A. Acamprosate
B. Disulfiram
C. Naltrexone
D. Oxazepam

**Correct Answer:** C. Naltrexone

**Core Concept:**
Alcoholism is a chronic disease characterized by compulsive alcohol consumption despite adverse consequences. Detoxification aims to eliminate alcohol from the body, but long-term management focuses on reducing craving and preventing relapse. Several drugs are available for this purpose, including Acamprosate, Disulfiram, Naltrexone, and Oxazepam.

**Why the Correct Answer is Right:**
Naltrexone is an opioid receptor antagonist that reduces alcohol craving and relapse rates in alcohol-dependent individuals. By blocking opioid receptors, Naltrexone prevents the rewarding effects of alcohol consumption, decreasing the drive to drink. Naltrexone is particularly useful for patients who have completed detoxification and continue to face challenges in maintaining sobriety.

**Why Each Wrong Option is Incorrect:**

A. Acamprosate (A): Acamprosate is an amino acid derivative that helps restore the imbalance of neurotransmitters (gamma-aminobutyric acid and glutamate) in alcohol-dependent patients. It reduces the typical withdrawal symptoms and prevents craving for alcohol. However, unlike Naltrexone, Acamprosate does not block any receptors, making Naltrexone a better choice for reducing relapse risk.

B. Disulfiram (D): Disulfiram is a widely known "anti-drinking" medication, often referred to as the "alcohol disulfiram reaction." It interferes with alcohol breakdown, causing severe side effects when alcohol is consumed. Disulfiram is not effective in reducing craving once alcohol withdrawal is complete, unlike Naltrexone, which is beneficial even after detoxification.

C. Oxazepam (D): Oxazepam is a benzodiazepine, primarily used for anxiety, insomnia, and seizures. It is not specifically designed to reduce alcohol craving or prevent relapse, unlike Naltrexone, which directly targets the brain's reward system and relapse prevention.

D. Naltrexone (C): Naltrexone, an opioid antagonist, is the correct option for reducing alcohol craving and preventing relapse after detoxification. By blocking mu-opioid receptors, Naltrexone reduces the hedonic response to alcohol, making it less appealing and reducing the likelihood of relapse. The other options do not target this specific mechanism.

**Clinical Pearls:**

1. In clinical practice, Naltrexone is often prescribed as part of a comprehensive relapse prevention plan, including psychosocial interventions, for alcohol-dependent patients.
2. Naltrexone is typically used in combination with other medications like Acamprosate and/or cognitive-behavioral therapy (CBT) to increase treatment efficacy for alcohol dependence.
3. Naltrexone is administered or