Low Dose Naltrexone in Veterinary Medicine | A Rising Star?

March 3, 2025
Low Dose Naltrexone in veterinary medicine Cover

Explore how Low Dose Naltrexone in veterinary medicine is revolutionizing treatments for various animal health conditions.

Naltrexone, an opioid antagonist, has been used for several decades in human medicine at relatively high doses to treat opioid addiction and alcohol dependence.

However, over the last decade, an increasing amount of research and evidence would suggest that much lower doses of naltrexone, referred to as LDN, may offer therapeutic benefits in a variety of conditions in both humans and animals.

This article shall explore the emerging applications of Low Dose Naltrexone in veterinary medicine, discussing its possible uses, dosage and administration, possible side effects and precautions, and where to buy LDN for veterinary use. 

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Low Dose Naltrexone in veterinary medicine

High-dose naltrexone blocks opioid receptors; however, LDN, as most would define, from 0.5 to 5 mg in human dosage and suitably adjusted in veterinary doses, is considered to operate under a different mechanism.

It appears that the short-term block of opioid receptors with LDN stimulates a rebound in the release of endogenous opioids increasing the production of enkephalins/endogenous opioids.

This modulation is considered anti-inflammatory and may therefore affect the immune system.

The exact mechanisms, though still in investigation, have raised interest in low dose naltrexone in veterinary medicine for a range of applications.

Although the low dose naltrexone in veterinary medicine is only now being systematically explored, recent research and clinical experience suggest it may be useful in the treatment of several disease conditions

The immunomodulatory actions of LDN have created interest in the drug’s use in autoimmune diseases in animals.

Such conditions, wherein the body’s immune response, in the process of combating some perceived foreign invader, essentially attacks itself may conceivably benefit from LDN treatment.

Very limited research in veterinary medicine by a few veterinarians with LDN as a complementary therapy in such instances.

Several human studies have hinted at the antitumor activity of low dose naltrexone in veterinary medicine, probably because of mediation effects on cell growth and proliferation.

While veterinary oncology needs more studies, several veterinarians are looking into LDN as an additional therapy for specific cancers, especially carcinomas and lymphomas.

It must be strongly stressed that LDN should never replace standard treatments, including chemotherapy, radiation, or surgery, in cancer treatment.

LDN seems to facilitate an increase in endorphin production, further relieving pain.

Whereas classic analgesics target specific pathways, the potential ability of LDN to enhance natural pain-relieving mechanisms might become a very attractive option in chronic pain states.

It can be very useful in a combination of treatments with other analgesics.

This is very promising research for conditions such as osteoarthritis or neuropathic pain.

Because of its possible anti-inflammatory properties, LDN might be used in the treatment of various inflammatory conditions in animals.

This could include conditions like allergies, skin inflammation, and other chronic inflammatory diseases. 

Reports indicate that low dose naltrexone in veterinary medicine might have a calming effect by possibly reducing anxiety and aggression.

The mechanisms in this case are not very well understood but may be related to the influence of LDN on endorphin levels and nervous system activity.

Behavioral issues are complex problems that need comprehensive solutions including environmental management and training.

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Dosage and administration of low dose naltrexone in veterinary medicine are of great concern and must always be elicited under the prescription of a licensed veterinarian.

There is no dosing for all species, as the optimum dose will depend on species, breed, size, and disease.

Dosing is based on weight, and most cases start at a low dose with a gradual titration upward to achieve the desired endpoint.

LDN is most often administered orally, in a capsule, tablet, or liquid.

Since commercially available human LDN products may not be appropriately dosed or formulated for animals, compounding pharmacies often prepare LDN formulations specifically for veterinary use.

It is important to work closely with a veterinarian along with a reputable compounding pharmacy to ensure appropriate dosing and formulation.  

LDN is generally well tolerated in animals; however, there are some common side effects. These include:

  • Changes in appetite: Some animals develop a decrease or increase in appetite.
  • Gastrointestinal upset: Mild nausea, vomiting, or diarrhea may occur.  
  • Changes in sleep patterns: Some animals may exhibit vivid dreams or changes in sleep patterns.
  • Restlessness or hyperactivity: This rarely occurs with LDN.

It is critical to monitor the animals closely for any signs of adverse effects and to consult a veterinarian if there are any concerns.

LDN may not be suitable for all animals, and certain precautions ought to be considered.

Although published case studies on the use of LDN in animals are few and widely scattered, some anecdotal reports and clinical experiences do support its potential benefits.

Several veterinarians have reported successful management of IBD in dogs and cats and symptomatic improvement in the quality of life of dogs with cancer using LDN. These are, however, anecdotal reports, and more research needs to be carried out to confirm such findings.

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Low dose naltrexone in veterinary medicine is a prescription medication and must be obtained through a licensed veterinarian.

Veterinarians can then prescribe LDN and work with a compounding pharmacy to have it prepared specifically for the animal’s needs.

Welltopia Pharmacy is a reputable compounding pharmacy that specializes in preparing medications for animals, including LDN.

They can work with veterinarians to provide accurate dosing and appropriate formulations for various species.  

Low dose naltrexone in veterinary medicine is one of the most promising fields of study, possibly being used to treat autoimmune diseases, cancer, chronic pain, and even inflammatory diseases.

Although more research is necessary to understand its mechanisms of action and standard dosing, LDN may offer an important therapeutic opportunity for some animals when administered in a licensed veterinarian’s care.