Naltrexone is used in opioid addiction. Which of the following is true?
**Core Concept**
Naltrexone is a medication used in the management of opioid addiction, specifically for the treatment of alcohol dependence and opioid use disorder. It is an opioid receptor antagonist, which means it blocks the effects of opioids at their receptor sites in the brain.
**Why the Correct Answer is Right**
Naltrexone works by binding to opioid receptors in the brain, preventing the binding of endogenous opioids (such as endorphins) and exogenous opioids (such as heroin or morphine). This blockade reduces the reinforcing effects of opioids, making it less desirable for individuals to continue using them. By reducing the euphoric effects of opioids, naltrexone helps individuals overcome physical dependence and maintain abstinence.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because naltrexone is not a substitute for opioid therapy, but rather a medication used in conjunction with counseling and other forms of therapy to help individuals overcome addiction.
* **Option B:** This option is incorrect because naltrexone does not directly stimulate dopamine release in the brain, unlike medications like methadone or buprenorphine.
* **Option C:** This option is incorrect because while naltrexone can be used in conjunction with other medications, it is not primarily used to treat withdrawal symptoms.
**Clinical Pearl / High-Yield Fact**
Naltrexone should not be used in individuals who are currently taking opioids or have recently used opioids, as it can precipitate severe withdrawal symptoms. It is essential to ensure that individuals are opioid-free for a specified period before initiating naltrexone therapy.
**Correct Answer:** C.