Final answer:
Naltrexone works by decreasing the pleasant effects of alcohol and blocking the intoxicating effects of alcohol. It is an opiate antagonist used to help individuals with alcohol or opioid dependence.
Step-by-step explanation:
The drug naltrexone works by decreasing the pleasant effects of alcohol and blocking the intoxicating effects of alcohol. It is not an antidepressant and does not cause illness when alcohol is consumed. Naltrexone is classified as an opiate antagonist and is used to help individuals with alcohol or opioid dependence reduce their cravings and relapse rates.