Which precaution MUST be taken prior to treatment with naltrexone?

Which precaution MUST be taken prior to treatment with naltrexone?

• A. Check BUN to see if within normal range.
• B. Check Hgb and Hct for pre-existing anemia.
• C. Check WBC for pre-existing neutropenia.
• D. Client must be opiate free for 7-10 days prior to use of this medication.

Answer: (D)

The key safety issue with naltrexone is that it is an opioid receptor antagonist. If opioids are still in the body, blocking the receptors will precipitate an acute opioid withdrawal. Therefore, naltrexone must be started only after the patient has been opioid-free for a period, typically about 7–10 days, to allow opioids to clear and withdrawal to resolve. In patients using long-acting opioids (like methadone), the washout may need to be longer. While baseline liver function can be considered due to possible hepatotoxicity with naltrexone, the most important precaution before starting is ensuring there are no opioids in the system.

The key safety issue with naltrexone is that it is an opioid receptor antagonist. If opioids are still in the body, blocking the receptors will precipitate an acute opioid withdrawal. Therefore, naltrexone must be started only after the patient has been opioid-free for a period, typically about 7–10 days, to allow opioids to clear and withdrawal to resolve. In patients using long-acting opioids (like methadone), the washout may need to be longer. While baseline liver function can be considered due to possible hepatotoxicity with naltrexone, the most important precaution before starting is ensuring there are no opioids in the system.