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Taking people in United StatesPhase 2

Low-Dose Naltrexone for the Treatment of Painful Diabetic Neuropathy

Key facts

Who runs it
Dartmouth-Hitchcock Medical Center
Where
Lebanon, United StatesSee the site
Trial code
Status
Recruiting
Phase
Phase 2
People taking part
35 people, planned
Started
22 Dec 2020
Expected to end
Dec 2026
Type of study
Interventional, 2 groups
Treatments tested
  • Naltrexone
  • Placebo
Record updated
6 May 2026

Who can take part

Age
18 years and older
Sex
Women and men
Healthy volunteers
Cannot take part

The registry criteria, word for word

Show all 12 criteriaShow less

Who can take part

  • Diagnosis of Painful Diabetic Neuropathy (PDN) for >6 months
  • Has failed at least one prior standard treatment for PDN (Gabapentin, duloxetine, etc)
  • No other known causes of lower extremity neuropathic pain
  • Subjects capable of giving informed consent
  • Greater than 18 years of age
  • Stable on all current non-opioid pain medication for at least 1 month
  • English as primary language

Who cannot take part

  • Current opioid therapy or on opioid therapy within the past 1 month
  • Known allergy to naltrexone or naloxone
  • Active substance use disorder or alcohol use disorder as defined by DSM-V (The Diagnostic and Statistical Manual of Mental Disorders)
  • Current treatment for substance use disorder or alcohol use disorder
  • Presence of known causes of lower extremity neuropathic pain not attributed to PDN

Where in United States

  • Dartmouth Hitchcock Medical CenterLebanon, United StatesContact: Bruce M Vrooman, MDTaking people

About the trial

What the trial wants to find out

Diabetes affects more than 30 million people in the United States and is a leading cause of morbidity. Over 25% diabetics also suffer from debilitating painful diabetic neuropathy in the lower legs and feet. This pain can be severe, difficult to control, and have a significant negative impact on quality of life. Opioid medications have historically been a mainstay of treatment for this pain, despite the risks. As the death toll from the U.S. opioid epidemic continues to rise, the need for quality alternative non-opioid medications to treat pain becomes more urgent. One of these potential medications is Low-Dose Naltrexone (LDN). This drug is reported to work by enhancing the body's natural pain relieving mechanisms and decreases inflammation by targeting specific cells called microglia which have been shown to influence chronic pain. LDN has been shown to be a safe medication with minimal side effects. Its efficacy has been demonstrated in other painful conditions but has never been fully studied for treating painful diabetic neuropathy. The goal of this randomized, placebo-controlled trial is to determine if LDN is effective for treating the pain caused by diabetic neuropathy. LDN's mechanism of action is well suited to treating painful diabetic neuropathy, and LDN shows significant promise as a safe, non-opioid alternative that can decrease pain and improve quality of life for those suffering from this painful condition.

The 2 groups in the trial

  • Group A, Low-Dose Naltrexone, Then PlaceboTreatment being tested

    Group A will receive active drug (Naltrexone 1 capsule by mouth daily, 1.5mg x1 week, 3mg x1 week, and 4.5 mg x6 weeks) for the first 8 weeks. Capsules of different dosages will be indistinguishable. Then followed by 4 weeks of placebo (placebo capsule will be matched with LDN capsule, microcrystalline cellulose filler, 1 capsule daily).

    Treatment: Naltrexone and Placebo

  • Group B, Placebo, Then Low-Dose NaltrexoneTreatment being tested

    Group B will receive 4 weeks of placebo (placebo capsule will be matched with LDN capsule, microcrystalline cellulose filler, 1 capsule daily). Then followed by active drug (Naltrexone 1 capsule by mouth daily, 1.5mg x1 week, 3mg x1 week, and 4.5 mg x6 weeks) for the last 8 weeks. Capsules of different dosages will be indistinguishable.

    Treatment: Naltrexone and Placebo

Questions to ask the study team

  1. How often do I need to come in, and for how long each time?
  2. Are travel costs paid?
  3. Can I keep my own doctor?
  4. What happens if I want to stop?

Contact the study team: see the registry record → Contacts and Locations

Print a page for my doctor

Data and sources

Registry record
Listed on ClinicalTrials.gov.
Official title
Low-Dose Naltrexone for the Treatment of Painful Diabetic Neuropathy, a Small, Randomized, Double-blind, Placebo-controlled Crossover Trial
Record updated
6 May 2026