Low-Dose Naltrexone (LDN): Uses, Dosing, and Why It Must Be Compounded
LDN is one of the most widely requested compounded medications. Here's what the research says, how dosing works, and why you can't get it at a chain pharmacy.
The short answer: low-dose naltrexone (LDN) is naltrexone prescribed at 0.5–4.5 mg, roughly a tenth of its FDA-approved 50 mg dose, used off-label for autoimmune conditions, fibromyalgia, and chronic pain. Because no manufacturer makes tablets that small, every LDN prescription in the United States is prepared by a compounding pharmacy.
KeyPoints
- LDN uses doses of 0.5–4.5 mg, far below the 50 mg addiction-treatment dose
- It is prescribed off-label. Your provider decides if it fits your case
- Typical protocols start low (0.5–1.5 mg) and titrate up over 4–8 weeks
- LDN cannot be combined with opioid pain medications
- Only compounding pharmacies can prepare LDN capsules and titration packs
EndKeyPoints
How does low-dose naltrexone work?
At 50 mg, naltrexone fully blocks opioid receptors for a day or more, that's its FDA-approved role in addiction medicine. At 0.5–4.5 mg taken at bedtime, the blockade is brief. The hypothesis supported by current research: this short blockade triggers a compensatory rise in endorphins and modulates microglial cells, dialing down neuroinflammation. That dual action, endorphin rebound plus glial modulation, is why researchers have studied LDN across so many inflammatory and pain conditions.
What conditions is LDN prescribed for?
All LDN use is off-label, meaning your prescriber applies clinical judgment to published evidence. Conditions where clinicians commonly prescribe it include:
- Fibromyalgia, small randomized trials at Stanford reported reduced pain severity
- Inflammatory bowel disease, pilot studies in Crohn's disease showed mucosal improvement
- Multiple sclerosis, studied for fatigue and quality-of-life measures
- Hashimoto's thyroiditis and other autoimmune thyroid conditions
- Chronic pain syndromes and long COVID, areas of active ongoing research
How is LDN dosed?
| Phase | Typical Dose | Duration | Notes |
|---|---|---|---|
| Starting | 0.5–1.5 mg nightly | 2–4 weeks | Minimizes sleep disturbance |
| Titration | Increase by 0.5–1 mg | Every 2–4 weeks | Per prescriber protocol |
| Target | 3–4.5 mg nightly | Ongoing | Common maintenance range |
| Re-evaluation | , | 8–12 weeks at target | Assess response with prescriber |
What should you expect for side effects?
Vivid dreams and lighter sleep in the first one to two weeks are the most reported effects, usually transient. Switching to morning dosing typically resolves persistent sleep issues. The critical safety rule: LDN blocks opioid receptors, so it cannot be combined with opioid medications, surgery or acute pain management requires a plan with your prescriber.
Getting LDN in Los Angeles
Generation Pharmacy compounds LDN capsules from 0.5 to 4.5 mg, including custom titration packs, typically ready in 1–2 business days from our West LA pharmacy. Learn more about low-dose naltrexone in our ingredient library, or see our longevity and wellness formulations. Questions about an LDN prescription? Call 424-228-1049 and talk directly with a compounding pharmacist.
Frequently Asked Questions
What is low-dose naltrexone used for?
Clinicians prescribe LDN off-label for conditions including fibromyalgia, Crohn's disease, multiple sclerosis, Hashimoto's thyroiditis, chronic pain, and long COVID. At 0.5–4.5 mg it is thought to briefly block opioid receptors, prompting a rebound in endorphins and modulating inflammation, a different mechanism than the 50 mg dose used for addiction treatment.
Why does LDN have to be compounded?
Commercial naltrexone only comes in 50 mg tablets, more than ten times the typical LDN dose. A compounding pharmacy prepares precise 0.5–4.5 mg capsules, including titration packs that step the dose up gradually over weeks.
How long does LDN take to work?
Most prescribers evaluate response after 8–12 weeks at the target dose. Some patients notice changes in sleep or pain earlier; others need several months. Patience and consistent dosing matter.
What are the side effects of low-dose naltrexone?
The most common are vivid dreams and sleep disturbance during the first weeks, which often resolve. Some prescribers start with morning dosing or a lower starting dose to minimize this. LDN should not be combined with opioid medications.
Is LDN safe to take long-term?
Published studies and decades of clinical use at low doses suggest a favorable safety profile, but long-term use should always be supervised by your prescriber with periodic re-evaluation.
Disclaimer: This content is provided for informational purposes only and is not intended as medical advice, diagnosis, or treatment. Always consult with a qualified healthcare professional regarding any medical condition or before starting any new treatment.
Related Articles
Compounded Peptides in 2026: What the FDA Panel Changed, and What a Non-Sterile Pharmacy Can Make Today
In July 2026 an FDA advisory committee recommended six peptides for the 503A list. None of them is legal to compound yet. Here is where each one stands, which peptides are components of approved drugs, and the non-peptide formulas prescribers are asking for most.
Compounded Testosterone: How Prescribing Works in California
Testosterone is a Schedule III controlled substance. Here is how a compounded testosterone prescription reaches a California pharmacy: who can write it, how it has to be sent, and why the pharmacy needs a DEA registration. Rx-only, prescriber-directed.
Understanding Hyperpigmentation and the Ingredients that Target it
Learn about the science behind hyperpigmentation and the ingredients prescribers use for different types of skin discoloration.