Why Take Low-Dose Naltrexone at Night?
Health & Wellness · Pain & Inflammation
Low-Dose Naltrexone: A Foundational Therapy for Pain, Inflammation, and Immune Health
As an opioid receptor antagonist, naltrexone is well known at higher doses (50 mg) for treating alcohol and drug addiction by blocking the euphoric and sedating effects of addictive substances.1 But at much lower doses — up to 4.5 mg — something different and remarkable happens.
Low-dose naltrexone (LDN) temporarily blocks opioid receptors, prompting the body to respond by producing more of its own endogenous opioids — endorphins and enkephalins. These flood back into the system in a "rebound" effect, supporting immune regulation, reducing inflammation, and promoting a sense of well-being.1,2
Although naltrexone is FDA-approved at higher doses for addiction, LDN is used off-label for a wide range of chronic conditions involving pain and inflammation — and the research is growing.3,4,5,6,7
Off-Label Uses
LDN is non-addictive and has been studied across a broad range of chronic conditions:
Conditions Being Studied or Treated with LDN
- Reduces inflammatory signaling, leading to decreased pain and inflammation
- May reduce brain fog, especially in patients with long COVID — often linked to impaired immune function
- Autoimmune and inflammatory diseases: multiple sclerosis, Crohn's disease, IBD, autoimmune thyroid disease, and arthritis
- Chronic pain syndromes such as fibromyalgia and neuropathic pain
- Erythrodermic psoriasis
- Autoimmune alopecia (hair loss)
- Under investigation as a solo and adjunct treatment for various cancers (lung, breast, ovarian, and others)8
How to Take LDN
Start Low
Your provider will begin at a very low dose and increase it gradually as tolerated. Results may take several months.
Take It at Night
With a half-life of 4–6 hours, bedtime dosing aligns with the body's natural repair cycle — when inflammation is highest and cortisol is lowest.1,6,10
Stay Consistent
LDN is a long-term, foundational therapy. For some, meaningful improvement may take up to a year of consistent use.
Medications to Avoid
LDN is generally safe to combine with most antidepressants and may even enhance their effectiveness, particularly for treatment-resistant depression or co-occurring chronic pain. However, there are important exceptions:
What to Avoid While Taking LDN
- Bupropion (Wellbutrin) — may cause elevated blood pressure and increased heart rate9
- All opioids (including tramadol, oxycodone, and codeine) — can cause severe withdrawal and render pain medication ineffective
- Alcohol — can cause excessive drowsiness
- Immunosuppressants — consult your doctor before combining2
With consistent use over time, many people report a gradual reduction in pain, fewer inflammatory flares with quicker recovery, better sleep quality and clearer thinking, and a general sense of improved resilience and well-being.
The Bottom Line
Safe, effective, and with few side effects, low-dose naltrexone holds genuine promise for alleviating many symptoms of modern life — namely, chronic inflammation. It is best approached as a long-term, foundational therapy: start low, stay consistent, and give it time. For those dealing with autoimmune conditions, chronic pain, long COVID, or treatment-resistant mood disorders, LDN may be one of the most underutilized tools available.
References
- Toljan K, Vrooman B. Low-dose naltrexone (LDN) — review of therapeutic utilization. Med Sci (Basel). 2018;6(4):82.
- Center for Pain Management. Low dose naltrexone. https://www.centerforpain.net/low-dose-naltrexone. Accessed February 5, 2026.
- de Carvalho JF, Skare T. Low-Dose Naltrexone in Rheumatological Diseases. Mediterranean Journal of Rheumatology. 2023;34(1):1–6.
- Bonilla H, et al. Low-dose naltrexone use for the management of post-acute sequelae of COVID-19. International Immunopharmacology. 2023;124(Pt B):110966.
- Isman A, et al. Low-dose naltrexone and NAD+ for the treatment of patients with persistent fatigue symptoms after COVID-19. Brain Behav Immun Health. 2024;36:100733.
- Beltran Monasterio EP. Low-dose Naltrexone: An Alternative Treatment for Erythrodermic Psoriasis. Cureus. 2019;11(1):e3943.
- American Hair Loss Association. Low dose naltrexone: A new frontier in the battle against hair loss. https://www.americanhairloss.org.
- Khan A. Low dose naltrexone in cancer prevention and treatment. LDN Research Trust Conference. 2018.
- MedlinePlus. Naltrexone and bupropion. U.S. National Library of Medicine. https://medlineplus.gov/druginfo/meds/a6190.
- Krueger JM. The role of cytokines in sleep regulation. Current Pharmaceutical Design. 2008;14(32):3408–3416.
Author
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This content is for educational and informational purposes only and is not intended as medical advice. Always consult a licensed healthcare provider before starting any new medication or treatment.
