Low-dose naltrexone presents an innovative approach to addressing various medical conditions. This discussion explores its mechanism of action, diverse applications, and precautionary measures to be mindful of during its administration.

Naltrexone, initially sanctioned by the FDA for managing opioid use disorder (OUD) and alcohol use disorder, has a history dating back to its discovery in 1969, surpassing 50 years. However, it gained prominent recognition in 1972 when the U.S. Congress enacted the Drug Abuse Office and Treatment Act, aiming to counteract substance misuse.

Recent research suggests that low-dose naltrexone (LDN) exhibits efficacy in treating a spectrum of additional conditions. This conversation delves into the nature of LDN, its operational mechanisms, and essential considerations to observe when incorporating it into a treatment regimen.

What is Naltrexone, and What is it Used For?

Naltrexone functions as an opioid antagonist, exerting its effects by inhibiting the opioid and endorphin receptors within the body. Consequently, individuals undergoing naltrexone treatment encounter reduced cravings for substances like opioids and alcohol.

Scientific investigations indicate that individuals using naltrexone exhibit a greater frequency of opioid-free weeks compared to those administered a placebo. Moreover, a noteworthy finding reveals that as many as 36% of individuals with opioid use disorder (OUD) who undergo naltrexone treatment achieve complete abstinence from opioids.

Similarly, results from clinical trials indicate a twofold increase in the proportion of alcohol-dependent patients who can achieve abstinence from alcohol when using naltrexone, in contrast to those given a placebo.

How to Take Naltrexone?

Naltrexone is offered in two formulations:

  1. A 50 mg oral tablet.
  2. A 380 mg intramuscular (IM) injection.

Despite the increased discomfort associated with the intramuscular injection, healthcare professionals often favor this method for two key reasons:

  1. Extended Duration of Action: The effects of the intramuscular injection persist for a month, in contrast to the oral tablets, which provide relief for only a few days. This feature is particularly beneficial for patients who may struggle with adherence to daily medications.
  2. Accessibility for Non-Swallowers: The intramuscular injection emerges as the preferred choice for patients who face challenges in swallowing the oral formulation, addressing the needs of individuals with difficulty taking medication orally.

Read Also: Duphaston 10mg Tablet: Uses, Dosage, Side Effects, Composition, and more.

Pros and Cons of Low Dose Naltrexone

Pros of Low Dose Naltrexone (LDN)

  • Versatile Treatment
  • Low Risk of Side Effects
  • Long-Lasting Effects
  • Potential for Opioid and Alcohol Addiction Treatment

Cons of Low Dose Naltrexone (LDN)

  • Limited FDA Approval
  • Potential Drug Interactions
  • Not Suitable for All Patients

Differences Between Low Dose Naltrexone and Alzam

Low Dose Naltrexone (LDN)

Low dose naltrexone is used for various conditions, including chronic pain, autoimmune disorders, and mental health conditions. It works by modulating the immune system and neurotransmitter activity.

Alzam (Alprazolam)

Alprazolam, sold under the brand name Alzam, is a benzodiazepine primarily prescribed for the treatment of anxiety disorders, panic disorders, and certain other conditions. It acts as a central nervous system depressant.

Alternative to Low Dose Naltrexone

Chronic Pain

  • Alternative Medications: Non-opioid analgesics, such as acetaminophen or nonsteroidal anti-inflammatory drugs (NSAIDs).
  • Physical Therapy: Exercise programs, stretching, and other physical therapy modalities.
  • Antidepressants or Anticonvulsants: Medications like amitriptyline or gabapentin may be considered for certain types of chronic pain.

How is Naltrexone Dosed?

The dosing of naltrexone varies depending on the chosen formulation.

In the case of the oral tablet, the dosage typically falls within the range of 25 to 100 mg, guided by factors such as the patient's substance use history and overall health. Medical practitioners commonly initiate treatment with a 25 mg dose and gradually escalate it, provided users do not encounter withdrawal symptoms.

Conversely, the intramuscular (IM) injection is administered on a monthly basis at a consistent dose of 380 mg, offering a fixed and convenient approach to naltrexone therapy.

What is Low Dose Naltrexone, and How Does it Work?

Low dose naltrexone (LDN) encompasses naltrexone doses ranging from 1 to 5 mg, and its efficacy is attributed to three primary mechanisms of action:

  1. Stimulation of 'Feel Good' Hormones: LDN operates by prompting the release of neurotransmitters associated with positive emotions in the brain, contributing to an enhanced sense of well-being.
  2. Suppression of Inflammatory Chemicals: LDN restricts the production of inflammatory chemicals within the body, thereby exerting anti-inflammatory effects that can be beneficial in various medical conditions.
  3. Modulation of Natural Opioid Production: LDN plays a role in regulating the production of natural opioids in the body, contributing to a balance in the opioid system and potentially influencing pain perception and immune function.

What Are Low Dose Naltrexone Uses?

Due to its versatile mechanism of action, healthcare professionals often employ low dose naltrexone (LDN) off-label, yielding promising outcomes in the management of various conditions. These encompass:

  1. Fibromyalgia
  2. Chronic Fatigue Syndrome
  3. Chronic Pain
  4. Autoimmune Conditions: Such as rheumatoid arthritis, multiple sclerosis, and Crohn's disease.
  5. Obesity
  6. Cholestatic Pruritus
  7. Depression
  8. Post-Traumatic Stress Disorder (PTSD)
  9. Cancer

The utilization of LDN across this spectrum of health issues underscores its potential as a therapeutic option beyond its initially established applications.

What to Avoid When Taking Low Dose Naltrexone

Low dose naltrexone (LDN) is generally associated with a low risk of side effects, and the majority of these effects are mild and self-resolving. Nevertheless, although rare, more severe adverse reactions, including allergic responses, can occur. To minimize the risk of side effects, doctors recommend avoiding the following:

Opioids and Alcohol

Individuals initiating naltrexone treatment should be free from opioids and alcohol for a period of at least 7 to 10 days. Starting naltrexone while still under the influence of opioids or alcohol may precipitate withdrawal symptoms, which can include:

  1. Anxiety
  2. Sleeplessness
  3. Fever
  4. Sweating
  5. Flu-like symptoms
  6. Hot or cold flushes
  7. Muscle aches and twitches
  8. Nausea and vomiting
  9. Diarrhea
  10. Stomach pain

To mitigate the risk of these withdrawal symptoms, it is crucial for patients to adhere to the recommended opioid- and alcohol-free duration before commencing naltrexone therapy. This precaution helps ensure a safe and effective initiation of the treatment.

Certain Medications

Users of low dose naltrexone (LDN) should exercise caution and avoid certain common medications that contain opioids and alcohol to prevent potential interactions. Examples of medications that should be avoided when taking LDN include:

  1. Opioid Analgesics: Examples include hydrocodone, oxycodone, codeine, fentanyl, and tramadol. Combining LDN with these medications can interfere with its intended effects.
  2. Cough and Cold Remedies: Medications such as Phenergan or promethazine, commonly used to alleviate symptoms of coughs and colds, may contain substances that could interact with LDN.
  3. Antidiarrheal Medication: Some antidiarrheal medications may contain opioids, and their use alongside LDN could lead to unintended consequences.

It is crucial for individuals taking LDN to inform their healthcare providers about all the medications, including over-the-counter and prescription drugs, they are using to avoid potential complications and ensure the safe and effective use of LDN.

What Health Conditions Put You at Risk When Taking LDN?

The metabolism of naltrexone occurs in the liver, and its elimination from the body is primarily managed by the kidneys. Consequently, individuals with kidney or liver problems should exercise caution and avoid the use of low dose naltrexone (LDN).

Furthermore, individuals without pre-existing kidney or liver conditions who experience yellow discoloration of their eyes should promptly consult their physician, as this may indicate a potential issue that requires medical attention. Regular monitoring and open communication with healthcare providers are essential to ensure the safe use of LDN and address any emerging concerns related to kidney or liver function.


Low dose naltrexone (LDN) emerges as a multifaceted therapeutic option with its unique mechanisms of action, ranging from the modulation of 'feel good' hormones to the regulation of inflammatory processes and natural opioid production. Its off-label use for various conditions, including fibromyalgia, chronic fatigue syndrome, autoimmune disorders, and mental health conditions, underscores its promising potential in diverse medical realms.

While LDN generally exhibits a low risk of mild and self-resolving side effects, users should be cautious about potential interactions with opioids, alcohol-containing medications, and certain common drugs. Patients initiating naltrexone treatment should adhere to the recommended opioid- and alcohol-free duration to prevent withdrawal symptoms.

Individuals with kidney or liver problems are advised to avoid LDN, given the involvement of these organs in its metabolism and elimination. Additionally, vigilant monitoring and prompt consultation with a healthcare professional are crucial if yellow discoloration of the eyes occurs.

Overall, as research continues to unravel the full scope of LDN's applications, its careful and informed use, under the guidance of healthcare providers, holds promise in enhancing treatment outcomes for a spectrum of medical conditions.


My name is Wisdom Bassey, I'm a blog content writer and graphic designer who provides support and services for brands and different companies. I'm young and versatile, A tech enthusiast. I carry out deep research on every topic I choose to write about. You can reach me through my social media handles, I'm always available and ready to connect.

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