What Is Low-Dose Naltrexone?
Low-dose naltrexone, often called LDN, refers to naltrexone prescribed at much lower doses than the standard doses used for alcohol or opioid use disorder treatment. Standard naltrexone is commonly prescribed at doses such as 50 mg orally or as a monthly extended-release injection. Low-dose naltrexone is usually discussed in much smaller doses, often around 1.5 mg to 4.5 mg, although exact dosing depends on the prescribing provider.
Naltrexone is an opioid antagonist. That means it blocks opioid receptors in the brain and body. At standard doses, naltrexone may be used to help reduce alcohol cravings or block the effects of opioids after a person has fully stopped using opioids. Low-dose naltrexone is different. LDN is often discussed in relation to chronic pain, inflammation, autoimmune conditions, fibromyalgia, and other off-label uses.
At Brooks Healing Center, it is important to separate low-dose naltrexone from standard naltrexone used in medication-assisted treatment. They involve the same medication, but the dose, purpose, and clinical context may be very different.
Is Low-Dose Naltrexone the Same as Regular Naltrexone?
Low-dose naltrexone and regular naltrexone use the same active medication, but they are not used in the same way.
Standard naltrexone may be used as part of treatment for alcohol use disorder or opioid use disorder. It can help reduce alcohol cravings or block opioid effects after the body is opioid-free.
Low-dose naltrexone is usually used off-label. “Off-label” means a medication is being prescribed for a purpose that is not specifically approved by the FDA, even though a licensed provider may still legally prescribe it when medically appropriate.
The key differences include:
| Category | Standard Naltrexone | Low-Dose Naltrexone |
|---|---|---|
| Typical dose | Often 50 mg orally or monthly injection | Often around 1.5–4.5 mg |
| Common use | Alcohol or opioid use disorder treatment | Off-label chronic pain/inflammatory conditions |
| FDA-approved use | Alcohol and opioid use disorder | Not FDA-approved as LDN for chronic pain or autoimmune conditions |
| Addiction treatment role | May be part of MAT | Not a replacement for MAT |
| Opioid warning | Must be opioid-free before starting | Also may cause issues if opioids are present |
How Does Low-Dose Naltrexone Work?
Researchers are still studying exactly how low-dose naltrexone may work. At standard doses, naltrexone blocks opioid receptors. At low doses, some researchers believe it may temporarily block certain receptors in a way that influences endorphin activity, immune signaling, and inflammation.
LDN has been studied for conditions involving chronic pain or immune system activity, including:
- Fibromyalgia
- Chronic pain
- Multiple sclerosis symptoms
- Crohn’s disease
- Complex regional pain syndrome
- Some inflammatory conditions
- Long COVID symptoms in emerging research
However, the evidence is still developing. Some studies suggest possible benefits, but many have been small, early-stage, or limited in design. LDN should not be presented as a cure or guaranteed treatment.
Is Low-Dose Naltrexone Used for Addiction Treatment?
Low-dose naltrexone is not the same as standard naltrexone treatment for alcohol or opioid use disorder.
In addiction recovery, naltrexone is usually discussed at standard therapeutic doses. It may be prescribed to help reduce alcohol cravings or prevent opioid effects after a person has completed opioid withdrawal and is no longer physically dependent on opioids.
LDN may come up in recovery conversations because some people in recovery also deal with chronic pain, inflammation, fatigue, or autoimmune symptoms. For people with a history of opioid addiction, pain management can be complicated. Non-opioid options may be especially important, and some providers may consider LDN in certain cases.
That said, low-dose naltrexone should not be viewed as a standalone addiction treatment. It does not replace therapy, relapse-prevention planning, medical care, residential treatment, peer support, or standard medication-assisted treatment when those services are clinically appropriate.
Why People in Recovery Ask About LDN
People in recovery may ask about low-dose naltrexone for several reasons. Some are looking for non-opioid options for chronic pain. Others have heard online claims about LDN and want to know whether it is safe. Some may be trying to understand how LDN differs from standard naltrexone, Vivitrol, Suboxone, methadone, or other medications used in addiction treatment.
Common reasons people ask about LDN include:
- Chronic pain after stopping opioids
- Fibromyalgia symptoms
- Inflammation concerns
- Fatigue
- Autoimmune symptoms
- Fear of opioid pain medications
- Interest in non-controlled medication options
- Confusion between LDN and MAT medications
These are valid questions. But they should be discussed with a qualified medical provider who understands both the person’s health history and substance use history.
Low-Dose Naltrexone and Chronic Pain
Chronic pain is one of the most common reasons people search for low-dose naltrexone. Some research has explored LDN for fibromyalgia and other pain-related conditions. Early findings suggest that some people may experience symptom improvement, but the research is not strong enough to say LDN works for everyone.
This matters in addiction recovery because untreated pain can increase relapse risk. When someone has a history of opioid addiction, pain treatment should be handled carefully. The goal is to manage pain while reducing the risk of returning to opioid misuse.
LDN may be one possible discussion point with a medical provider, but it is only one piece of a broader pain-management plan. Other supports may include physical therapy, behavioral health care, non-opioid medications, movement, sleep support, trauma-informed care, and coping-skills development.
Can Low-Dose Naltrexone Cause Withdrawal?
Yes, naltrexone can cause opioid withdrawal if opioids are still active in the body. This risk applies to naltrexone generally, including low-dose use.
Because naltrexone blocks opioid receptors, it can displace opioids from those receptors and trigger sudden withdrawal in someone who is physically dependent on opioids. This is why people should not start naltrexone without medical guidance, especially if they have recently used opioids, take opioid pain medication, or may need opioid medication for surgery or injury.
Opioids may include:
- Heroin
- Fentanyl
- Oxycodone
- Hydrocodone
- Morphine
- Codeine
- Methadone
- Buprenorphine
- Opioid pain medications after surgery or injury
Anyone considering LDN should tell their provider about all medications, recent opioid use, and substance use history.
Side Effects of Low-Dose Naltrexone
Low-dose naltrexone is often described as well tolerated, but side effects can still happen. Possible side effects may include:
- Vivid dreams
- Sleep changes
- Headache
- Nausea
- Fatigue
- Anxiety or restlessness
- Dizziness
- Stomach discomfort
- Mood changes
Some people may need dose adjustments or may not tolerate LDN well. People with liver concerns, kidney concerns, pregnancy, breastfeeding, or complex medical histories should discuss risks with a medical provider.
Who Should Be Careful With Low-Dose Naltrexone?
Low-dose naltrexone may not be appropriate for everyone. Extra caution may be needed for people who:
- Currently use opioids
- Recently stopped opioids
- Take methadone or buprenorphine
- May need opioid pain medication
- Have liver disease or abnormal liver tests
- Have kidney disease
- Are pregnant or breastfeeding
- Have complex psychiatric or medical conditions
- Are taking multiple medications
Because LDN is often compounded, quality and dosing consistency may also depend on the pharmacy. It should only be used under medical supervision.
Low-Dose Naltrexone vs. Vivitrol
Vivitrol is the brand name for extended-release injectable naltrexone. It is given as a monthly injection and is used for alcohol use disorder or opioid use disorder treatment when clinically appropriate.
LDN is different. It is typically taken by mouth in much smaller doses and is usually discussed for off-label uses such as chronic pain or inflammation.
| Category | Low-Dose Naltrexone | Vivitrol |
|---|---|---|
| Form | Usually oral compounded capsule or tablet | Monthly injection |
| Dose | Much lower dose | Extended-release standard dose |
| Primary use | Off-label symptom management | Alcohol or opioid use disorder treatment |
| FDA approval | Not FDA-approved as LDN for chronic pain | FDA-approved for alcohol and opioid use disorder |
| Treatment setting | Often outpatient medical prescribing | Addiction treatment or medical setting |
Low-Dose Naltrexone vs. Suboxone
Suboxone and low-dose naltrexone are very different medications.
Suboxone contains buprenorphine and naloxone. Buprenorphine is a partial opioid agonist, meaning it activates opioid receptors in a controlled way. It may be used to reduce opioid withdrawal symptoms and cravings.
Naltrexone is an opioid antagonist. It blocks opioid receptors. It does not activate them.
Because of this, naltrexone can trigger withdrawal if started too soon after opioids or buprenorphine. A person should never switch from Suboxone to naltrexone or LDN without medical supervision.
Is Low-Dose Naltrexone Addictive?
Naltrexone is not considered addictive and does not create a euphoric high. It is not a controlled substance. However, that does not mean it is risk-free. It can interact with opioid medications, cause side effects, and create serious problems if used without medical guidance in someone who is opioid-dependent.
For people in recovery, the question is not only whether a medication is addictive. The question is whether it is appropriate, safe, monitored, and part of a larger recovery plan.
Should People in Recovery Take Low-Dose Naltrexone?
Some people in recovery may be candidates for LDN, and others may not be. The answer depends on the person’s medical history, substance use history, pain condition, current medications, mental health needs, and recovery plan.
LDN may be worth discussing with a provider if a person:
- Has chronic pain or inflammatory symptoms
- Wants to avoid opioid pain medications
- Is not currently using opioids
- Has been medically cleared for naltrexone
- Understands that LDN is off-label
- Has realistic expectations
- Is also receiving appropriate recovery support
LDN may not be appropriate if a person is currently using opioids, taking buprenorphine or methadone, at risk of needing opioid pain medication, or has medical concerns that make naltrexone unsafe.
The Bottom Line on Low-Dose Naltrexone
Low-dose naltrexone is a lower-dose form of naltrexone that is most often discussed for off-label uses such as chronic pain, fibromyalgia, inflammation, and certain immune-related conditions. Some early research is promising, but LDN is not a cure-all and is not FDA-approved for those uses.
For people in addiction recovery, LDN can be confusing because standard naltrexone is also used in alcohol and opioid use disorder treatment. The key point is that dose, purpose, and timing matter.
LDN should never be started casually, especially by someone who uses opioids or recently stopped opioids. It should be discussed with a qualified medical provider who understands the person’s full health and recovery history.
Addiction Treatment and Medication Support at Brooks Healing Center
Brooks Healing Center provides addiction treatment for people who need structure, support, and evidence-informed care. Medication questions can be an important part of recovery, especially when someone is managing cravings, withdrawal history, chronic pain, or co-occurring mental health symptoms.
Our team helps clients understand treatment options in context. Recovery is not about chasing one medication or one quick fix. It is about building a stable plan that supports physical health, emotional healing, relapse prevention, and long-term change.
If you have questions about naltrexone, low-dose naltrexone, MAT, chronic pain in recovery, or treatment options for substance use, Brooks Healing Center can help you take the next step.
FAQ: Low-Dose Naltrexone
What is low-dose naltrexone?
Low-dose naltrexone is naltrexone prescribed at much lower doses than standard naltrexone treatment. It is often discussed for off-label uses such as chronic pain, fibromyalgia, inflammation, and certain immune-related conditions.
Is low-dose naltrexone FDA-approved?
Naltrexone is FDA-approved for alcohol use disorder and opioid use disorder at standard doses. Low-dose naltrexone is not FDA-approved specifically for chronic pain, fibromyalgia, autoimmune conditions, or inflammation-related uses.
Is low-dose naltrexone used for addiction?
Low-dose naltrexone is not the standard form of naltrexone used for addiction treatment. Standard-dose naltrexone may be used for alcohol or opioid use disorder. LDN is more commonly discussed for off-label pain or inflammatory conditions.
Can low-dose naltrexone help with chronic pain?
Some research suggests LDN may help certain people with chronic pain or fibromyalgia symptoms, but the evidence is still limited. More large, high-quality studies are needed.
Can low-dose naltrexone cause opioid withdrawal?
Yes. Naltrexone can trigger opioid withdrawal if opioids are still in the body or if someone is physically dependent on opioids. This includes people taking opioid pain medications, methadone, or buprenorphine.
Is low-dose naltrexone addictive?
No. Naltrexone is not considered addictive and does not create a high. However, it can still cause side effects and should only be used with medical guidance.
What are common side effects of low-dose naltrexone?
Possible side effects may include vivid dreams, sleep changes, headache, nausea, fatigue, dizziness, anxiety, or stomach discomfort.
Can I take low-dose naltrexone with Suboxone?
Do not combine or switch between Suboxone and naltrexone without medical supervision. Naltrexone can trigger withdrawal in people taking buprenorphine.
Is LDN the same as Vivitrol?
No. Vivitrol is an extended-release injectable form of naltrexone used for alcohol or opioid use disorder treatment. LDN is a much lower-dose oral form usually discussed for off-label uses.
Should I ask my doctor about low-dose naltrexone?
Yes, especially if you have chronic pain, inflammation-related symptoms, or a history of substance use. A provider can help determine whether LDN is safe and appropriate based on your full medical history.
Sources
Kim, P. S., & Fishman, M. A. (2020). Low-dose naltrexone for chronic pain: Update and systemic review. Current Pain and Headache Reports, 24, 64. https://pubmed.ncbi.nlm.nih.gov/32845365/
National Institute on Alcohol Abuse and Alcoholism. (n.d.). Alcohol treatment navigator: Medications. https://alcoholtreatment.niaaa.nih.gov/treatments-medications/medications
Substance Abuse and Mental Health Services Administration. (n.d.). Medications for substance use disorders. https://www.samhsa.gov/substance-use/treatment/options
Toljan, K., & Vrooman, B. (2018). Low-dose naltrexone (LDN)—review of therapeutic utilization. Medical Sciences, 6(4), 82. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6313374/
Younger, J., Parkitny, L., & McLain, D. (2014). The use of low-dose naltrexone as a novel anti-inflammatory treatment for chronic pain. Clinical Rheumatology, 33, 451–459. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3962576/
