A Different Approach to Treating Opioid Use Disorder
Opioid use disorder (OUD) is a chronic condition that affects brain chemistry, behavior and physical health. Medications are widely recognized as the most effective treatment, but not all medications work the same way.
Unlike methadone or Suboxone, which activate opioid receptors, naltrexone takes a different approach. It blocks opioids entirely. For certain individuals, especially those who’ve already completed detox, naltrexone can play an important role in relapse prevention.
What Is Naltrexone?
Naltrexone is an opioid antagonist, meaning it blocks opioid receptors rather than activating them. It’s approved by the FDA for the treatment of opioid use disorder and alcohol use disorder.
Naltrexone is available in two forms:
- Oral naltrexone, taken daily
- Extended-release injectable naltrexone, administered once a month
Both forms work the same way in the brain, but the injectable version provides consistent coverage without daily dosing.
How Naltrexone Works in the Brain
Opioids produce euphoria and pain relief by activating opioid receptors in the brain. Naltrexone binds to these receptors and prevents opioids from attaching.
If someone takes opioids while on naltrexone, they don’t experience the expected effects. This blockade removes the reward associated with opioid use, reducing the incentive to relapse.
Because naltrexone displaces opioids from receptors, people must be fully detoxed before starting it. Starting naltrexone too soon can trigger sudden and severe withdrawal.
How Naltrexone May Help With Opioid Use Disorder
Naltrexone is primarily used as a relapse-prevention tool rather than a withdrawal-management medication.
It may help by:
- Blocking the euphoric effects of opioids
- Reducing the perceived payoff of relapse
- Supporting abstinence-based recovery goals
For individuals who are committed to remaining opioid-free, naltrexone can act as a protective layer during early recovery.
Who Naltrexone May Help Most
Naltrexone isn’t the best choice for everyone, but it may be helpful for people who:
- Have completed detox and are opioid-free
- Are highly motivated for abstinence
- Don’t want to use opioid-based medications
- Have stable housing and support
Medical and psychological readiness is critical when considering naltrexone, especially due to the detox requirement.
What Naltrexone Doesn’t Do
Understanding naltrexone’s limits is essential.
Naltrexone:
- Doesn’t relieve opioid withdrawal symptoms
- Doesn’t reduce cravings for everyone
- Doesn’t prevent all relapse risk
- Doesn’t work without engagement in care
Because it doesn’t address withdrawal or cravings directly, some individuals find it harder to stay on naltrexone compared to agonist medications.
Effectiveness and What Research Shows
Research shows naltrexone can be effective in reducing relapse among people who adhere to treatment. However, adherence has historically been a challenge, especially with oral naltrexone.
The extended-release injectable form improves adherence and has been shown to reduce relapse risk compared to no medication. Still, overall retention rates are often lower than with methadone or buprenorphine.
These differences highlight the importance of matching the medication to the individual rather than assuming one approach fits all.
Side Effects and Safety Considerations
Most people tolerate naltrexone well, but side effects can occur. Common ones include:
- Nausea
- Headache
- Fatigue
- Dizziness
Naltrexone is processed by the liver, so liver function testing is required before starting and monitored during treatment. People with acute hepatitis or severe liver disease may not be candidates.
Another safety concern is overdose risk after discontinuation. Because naltrexone reduces opioid tolerance, relapse after stopping the medication can increase overdose risk if previous doses are resumed.
Naltrexone Compared to Other Medications for OUD
Naltrexone differs significantly from other FDA-approved OUD medications.
- Methadone and Suboxone (buprenorphine) activate opioid receptors to reduce withdrawal and cravings. They have higher retention rates and strong evidence for reducing overdose deaths.
- Naltrexone blocks receptors and requires detox, making it better suited for relapse prevention rather than stabilization.
- Vivitrol is the injectable form of naltrexone and follows the same principles with improved adherence.
No medication is universally better. Effectiveness depends on readiness, medical factors and treatment goals.
Common Myths and Misconceptions
Some people assume naltrexone is safer because it’s not an opioid. While it avoids opioid-related risks, it also lacks the protective effects against withdrawal and cravings that agonist medications provide.
Others believe naltrexone guarantees abstinence. In reality, it reduces reward but doesn’t eliminate risk, especially if treatment engagement declines.
When Naltrexone Is Part of a Treatment Plan
Naltrexone works best as part of a comprehensive plan that includes counseling, relapse-prevention strategies and regular follow-up. Clear planning around triggers, support systems and emergency response is essential.
For the right individual, naltrexone can provide structure and protection during a vulnerable stage of recovery. If you or a loved one needs help with opioid addiction, contact the National Rehab Hotline for assistance.
FAQ: Can Naltrexone Help With Opioid Use?
- Is Naltrexone Addictive?
No. Naltrexone isn’t habit-forming and doesn’t produce euphoria. - Do You Have to Be Fully Detoxed First?
Yes. Starting naltrexone before opioids are fully cleared can cause severe withdrawal. - Does Naltrexone Stop Cravings?
It can reduce cravings for some people, but not everyone. - Can You Overdose While on Naltrexone?
Naltrexone blocks opioid effects, but overdose risk increases if opioids are used after stopping the medication.
Is Naltrexone Better Than Methadone or Suboxone?
Not universally. The best option depends on individual needs, readiness and medical history.
