A nurse is assisting in the care of a client in an outpatient substance use disorder clinic who has been taking naltrexone for the past 30 days. Which of the following client statements indicates an expected response to the treatment?

Rationale: A. "My anxiety has been getting a little easier to deal with every day." Naltrexone is not primarily used to treat anxiety. While improvement in anxiety may occur secondarily as alcohol use decreases, this statement does not directly reflect the intended therapeutic effect of naltrexone in substance use treatment. B. "I have not had any cravings to drink since my visit last week." Naltrexone works by blocking opioid receptors involved in the brain’s reward system, reducing cravings and the pleasurable effects of alcohol. Decreased alcohol craving is a direct and expected response to naltrexone therapy in clients with alcohol use disorder. C. "When I had one drink last week. I had extreme nausea and vomited several times." This describes the effect of disulfiram, not naltrexone. Disulfiram causes an aversive reaction to alcohol, while naltrexone does not produce sickness when alcohol is consumed; it simply reduces the reward response. D. “Since I quit drinking. I have not had any hallucinations." Hallucinations are associated with alcohol withdrawal, not the effect of naltrexone. Naltrexone does not prevent withdrawal symptoms or hallucinations; it is used after detox to help maintain abstinence and reduce relapse.