Which of the following medications is NOT used to decrease alcohol cravings?

Fluoxetine, commonly known as Prozac, is a selective serotonin reuptake inhibitor (SSRI) primarily used to treat major depressive disorder, anxiety disorders, and some other mood-related conditions. While it can have a positive effect on mood and may alleviate depression that sometimes accompanies alcohol use disorders, it is not specifically indicated for reducing alcohol cravings.

In contrast, the other medications listed have a direct role in addressing alcohol cravings. Naltrexone works by blocking the receptors in the brain that are involved in the rewarding effects of alcohol, thus reducing the desire to consume it. Disulfiram acts as a deterrent by causing unpleasant reactions if alcohol is consumed, promoting abstinence. Acamprosate helps to restore the balance of neurotransmitters in individuals who are abstinent from alcohol, reducing cravings to drink by stabilizing the brain's chemistry.

Understanding the specific functions and indications of these medications helps clarify why Fluoxetine does not fit in the category of treatments aimed at decreasing alcohol cravings.