Trials / Completed
CompletedNCT00001344
Dextromethorphan Versus Placebo for Neuropathic Pain
- Status
- Completed
- Phase
- Phase 2
- Study type
- Interventional
- Enrollment
- 129 (planned)
- Sponsor
- National Institute of Dental and Craniofacial Research (NIDCR) · NIH
- Sex
- All
- Age
- —
- Healthy volunteers
- Not accepted
Summary
In our current clinical trial, we are comparing the effects of two NMDA receptor antagonists to placebo in patients with painful distal symmetrical diabetic neuropathy or post-herpetic neuralgia. The treatments in this three-period crossover study are dextromethorphan, up to 920 mg/day (about 8 times the antitussive dose), memantine, 30-50 mg/day, and placebo. Memantine is an NMDA antagonist used in Europe to treat Parkinson's disease and Alzheimer's disease. The underlying hypothesis, based on studies of painful neuropathies in animal models, is that neuropathic pain is caused largely by sensitization of central nervous system neurons caused by excitatory amino acid neurotransmitters, acting largely through NMDA receptors. A previous small trial of dextromethorphan suggested efficacy in diabetic neuropathy pain. The study requires one visit to the NIH outpatient Pain Research Clinic, and consists of three 9-week treatment periods. Patients who respond to one of the medications will be invited to participate in further controlled studies of the medication followed by up to several years of open-label treatment under continued observation.
Detailed description
In our current clinical trial, we are comparing the effects of two NMDA receptor antagonists to placebo in patients with painful distal symmetrical diabetic neuropathy or post-herpetic neuralgia. The treatments in this three-period crossover study are dextromethorphan, up to 920 mg/day (about 8 times the antitussive dose), memantine, 30-50 mg/day, and placebo. Memantine is an NMDA antagonist used in Europe to treat Parkinson's disease and Alzheimer's disease. The underlying hypothesis, based on studies of painful neuropathies in animal models, is that neuropathic pain is caused largely by sensitization of central nervous system neurons caused by excitatory amino acid neurotransmitters, acting largely through NMDA receptors. A previous small trial of dextromethorphan suggested efficacy in diabetic neuropathy pain. The study requires one visit to the NIH outpatient Pain Research Clinic, and consists of three 9-week treatment periods. Patients who respond to one of the medications will be invited to participate in further controlled studies of the medication followed by up to several years of open-label treatment under continued observation.
Conditions
Interventions
| Type | Name | Description |
|---|---|---|
| DRUG | dextromethorphan |
Timeline
- Start date
- 1993-03-01
- Completion
- 2001-02-01
- First posted
- 2002-12-10
- Last updated
- 2008-03-04
Locations
1 site across 1 country: United States
Source: ClinicalTrials.gov record NCT00001344. Inclusion in this directory is not an endorsement.