Medical Information Only. Consult your healthcare provider before considering clinical trial enrollment.
Complex Regional Pain Syndrome: later-stage trial registry
2 of 4 indexed Complex Regional Pain Syndrome trials are currently recruiting, with more weight in Phase 3-4.
Corpus placement: #4,115 of 28,707 conditions by registered trial count.
4 US clinical trials · 2 currently recruiting · #4,115 of 28,707 conditions by registered trial count
Complex Regional Pain Syndrome: 4 US clinical trials tracked, 2 recruiting.
Complex Regional Pain Syndrome is the subject of 4 registered US clinical trials on ClinicalTrials.gov, 2 of them currently open to new participants. 2 are in Phase 3-4 (later-stage) and 1 in Phase 1-2 (earlier-stage). The most active sponsor is Grünenthal, running 1 of these trials.
Enrollment posture brief
Registry condition complex-regional-pain-syndrome
OPEN 2 | RECR 50% | LATE 2 | EARLY 1 | RANK #4115 | SPON 1
Volume-matched condition peers
Nearest open-share peer: Abdominal Aortic Aneurysms (50% recruiting · 6 trials)
Complex Regional Pain Syndrome lists 2 open slots (50% of 4 indexed trials). Peers are matched on registered volume, not therapeutic-area browse lists. How peer matching works →
Key findings
What ClinicalTrials.gov does not surface for Complex Regional Pain Syndrome on its own pages , computed from the registry mirror as of 2026-08-08. Each line carries its own denominator so it can be quoted as it stands.
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Complex Regional Pain Syndrome is recruiting above its size-band peers.
2 of 4 indexed trials (50%) are open to enrollment, against a 46.5% average across 27,806 conditions with fewer than 20 trials. The peer set uses the same ClinicalTrials.gov-derived counts as this page.
Open and recent trials
4 total, page 1 of 1
Low-Dose Naltrexone for the Treatment of Complex Regional Pain Syndrome
Stanford University
NCT02502162
The Effects and Mechanisms of a High CBD Cannabis Extract (BRC-002) for the Treatment of Pain and Health in Complex Regional Pain Syndrome
University of California, San Diego
NCT06393101
Safety of Intravenous Neridronic Acid in CRPS
Grünenthal
NCT02972359
A Study Of Lidocaine Patch 5% Alone, Gabapentin Alone, And Lidocaine Patch 5% And Gabapentin In Combination For The Relief Of Pain In Patients With Diverse Peripheral Neuropathic Pain Conditions
Endo Pharmaceuticals
NCT00904202
Phase Distribution
| Phase | Trial count |
|---|---|
| Phase 1 | 1 |
| Phase 3 | 1 |
| Phase 4 | 1 |
Top Sponsors
Named interventions
Most-linked intervention names on Complex Regional Pain Syndrome records (sponsor-reported on ClinicalTrials.gov). Counts are trial links, not unique products.
US sites by state
Facility locations filed on Complex Regional Pain Syndrome trials. A trial with sites in several states counts in each.
Source: ClinicalTrials.gov, National Library of Medicine. Data is informational only.
Related
What to do with this Complex Regional Pain Syndrome page
4 registered trials, 2 currently recruiting, is a starting point for a conversation, not a diagnosis or a recommendation.
- 2 Complex Regional Pain Syndrome trials are currently recruiting, check eligibility criteria before contacting a site. Browse recruiting trials
- Grünenthal sponsors the most Complex Regional Pain Syndrome trials on record, review their full trial history before evaluating a specific study. See Grünenthal's trials
- Bring the specific trial ID (NCT number) to your own doctor before enrolling, this page is a directory, not medical guidance. Read the trial-finding guide
Trial and recruiting counts reflect ClinicalTrials.gov registry status as of the data vintage above; individual trial eligibility and enrollment status can change.
Every figure on PlainTrial is rendered directly from the ClinicalTrials.gov registry, no number is typed in by an editor. This Complex Regional Pain Syndrome condition card totals 4 registered trials; most-linked intervention Gabapentin 300 mg capsules 1800 mg/day + placebo patch; top US site state California. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error.