Low-Dose Naltrexone 4.5mg Capsules
Immune Modulation and Inflammation Support
Low Dose Naltrexone (LDN) is a compounded formulation of naltrexone at significantly lower doses than those used for addiction treatment. At these low doses, naltrexone is believed to work by briefly blocking opioid receptors, prompting the body to increase its natural endorphin production and modulate immune system function. LDN is being studied and used by practitioners for a wide range of conditions associated with immune dysregulation, chronic inflammation, and neurological conditions. It has been explored in the context of autoimmune diseases, fibromyalgia, chronic fatigue, and Crohn's disease, among others. AllMedRx compounds LDN in 1.5mg, 3mg, and 4.5mg capsules to allow for precise dose titration as directed by your healthcare provider.
This product requires a valid prescription from a licensed healthcare provider. LDN is a compounded medication not FDA-approved at these doses.
Custom Compounded Medications, Made Just for You

Overview
Click through below to see the questions we’re asked most about this medication.
How do I know if 4.5mg is right for me?
Your provider sets the strength on your prescription. We compound exactly what is prescribed.
Is 4.5mg the highest LDN strength offered?
Among our 1.5mg, 3mg, and 4.5mg options, this is the highest. Your provider decides what fits your needs.
Why is naltrexone compounded at this dose?
Low-dose strengths are not available in standard tablets, so they are compounded to order.
Is a prescription required?
Yes. This is a prescription-only medication, compounded only from a valid prescription.
How many capsules will I receive?
Each prescription is filled as 30 capsules unless your provider specifies otherwise.
Your personalized pharmacy care starts now
Tell us who you are and we’ll get you to the right place — or call our pharmacy team directly at 561-557-1645.
I’m a Patient
Transfer, refill, and receive your compounded medications — shipped straight to your door.
I’m a Provider
Partner with a 503A compounding lab that prepares every formulation to your exact prescription.
I’m a Pharmacy
Transfer or refer compound prescriptions your pharmacy can’t prepare — your patient stays yours.
Explore Our Compounded Medications
561-557-1645
Fax (providers): 561-557-1649
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Licensed in 31 states
USP <795> & <797>
DEA-registered
AllMedRx is a licensed 503A specialty compounding pharmacy in Palm Beach Gardens, Florida. From our state-of-the-art facility, we ship custom compounded medications straight to patients and coordinate care with their providers.
USP <795> Compliant
USP <797> Compliant
State Board of Pharmacy Licensed
DEA Registered Facility
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