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
- How often do I need to come in, and for how long each time?
- Are travel costs paid?
- Can I keep my own doctor?
- What happens if I want to stop?
Contact the study team: see the registry record → Contacts and Locations
Print a page for my doctorData 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