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Last Updated: March 28, 2026

CLINICAL TRIALS PROFILE FOR GABAPENTIN


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505(b)(2) Clinical Trials for gabapentin

This table shows clinical trials for potential 505(b)(2) applications. See the next table for all clinical trials
Trial Type Trial ID Title Status Sponsor Phase Start Date Summary
New Combination NCT00236223 ↗ The Effect of Gabapentin, Ketamine and Dexamethasone on Pain and Opioid Requirements After Hip Surgery Terminated Glostrup University Hospital, Copenhagen Phase 4 2005-10-01 Patients scheduled for primary hip replacement needs postoperative pain treatment, i.e. morphine. Morphine has side-effects: nausea, vomiting, sedation and dizziness. These side-effects are unpleasant for the patients and sometimes keeps them at bed longer time than needed. We investigate in new combinations of analgesics for postoperative pain, hoping to minimize the need for morphine.
OTC NCT00659100 ↗ A Trial to Assess Consumer Self-Selection and Use of Gabapentin for Occasional Sleeplessness in an Over-the-Counter Environment Completed Pfizer Phase 3 2006-08-01 The purpose of this study is to assess consumers' behaviors related to gabapentin self- selection and use, relative to warnings and directions for use, as described in the proposed over-the-counter (OTC) product label.
OTC NCT00659100 ↗ A Trial to Assess Consumer Self-Selection and Use of Gabapentin for Occasional Sleeplessness in an Over-the-Counter Environment Completed Pfizer's Upjohn has merged with Mylan to form Viatris Inc. Phase 3 2006-08-01 The purpose of this study is to assess consumers' behaviors related to gabapentin self- selection and use, relative to warnings and directions for use, as described in the proposed over-the-counter (OTC) product label.
OTC NCT00666575 ↗ A Study of the Safety of Gabapentin in a Potential Over-the-Counter Population With Occasional Sleeplessness Completed Pfizer Phase 3 2004-12-01 The purpose of this study is to assess the safety of gabapentin, as compared to placebo, in a potential over-the-counter population with reports of occasional sleeplessness
OTC NCT00666575 ↗ A Study of the Safety of Gabapentin in a Potential Over-the-Counter Population With Occasional Sleeplessness Completed Pfizer's Upjohn has merged with Mylan to form Viatris Inc. Phase 3 2004-12-01 The purpose of this study is to assess the safety of gabapentin, as compared to placebo, in a potential over-the-counter population with reports of occasional sleeplessness
>Trial Type >Trial ID >Title >Status >Phase >Start Date >Summary

All Clinical Trials for gabapentin

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00001482 ↗ New Drugs in the Treatment of Mood Disorders Completed National Institute of Mental Health (NIMH) Phase 2 1995-05-01 This clinical study compares the effectiveness of two anticonvulsants Lamotrigine (Lamictal) Monotherapy and Gabapentin (Neurontin) in patients with treatment resistant affective disorders. We initially have found that the response rate to lamotrigine (51%) exceeded that of gabapentin (28%) or placebo (21%). In this study the placebo phase has been dropped so that we examine possible clinical and biological factors predictors of response. The drugs will be given in a randomized order for six weeks each and you will not know when you are on a given one. There will be a 2-4 week "washout" period between treatments. If you respond well to one of these treatments, a longer open continuation period will be offered at the end of this study. This would involve one or both drugs in combination. A variety of rating scales and brain imaging procedures will also be offered before and during each drug evaluation. Both lamotrigine and gabapentin are generally well tolerated. A serious potentially life threatening rash occurs in about 1/500 patients treated with lamotrigine, however. Common side effects are rash, dizziness, unsteadiness, double vision, blurred vision, nausea, vomiting, insomnia, sedation, and headache. These side effects are usually mild, and resolve with continued time on the drug or a decrease in dosage.
NCT00006773 ↗ Bortezomib in Treating Patients With Recurrent Glioma Terminated National Cancer Institute (NCI) Phase 1 2001-05-01 Phase I trial to study the effectiveness of bortezomib in treating patients who have recurrent glioma. Bortezomib may stop the growth of tumor cells by blocking the enzymes necessary for tumor cell growth
NCT00007670 ↗ Does Gabapentin and Lamotriginel Have Significantly Fewer Side-Effects While Providing Equal or Better Seizure Control Than the Current Drug Choice, Carbamazepine, for the Treatment of Seizures in the Elderly. Completed Glaxo Wellcome Phase 3 1998-01-01 New onset epilepsy in the elderly occurs in 45,000-50,000 elderly patients each year. These patients are especially vulnerable to side effects from medications because of changes caused by the aging process and the fact that these patients often have many common diseases for which they are already receiving medications for so that the likelihood of drug interactions is increased. Two new drugs, gabapentin and lamotrigine, have recently been approved by the FDA as antiepileptic drugs. These drugs have demonstrated efficacy in the treatment of partial onset seizures, the most common seizures in the elderly. These new compounds also have favorable side effect profiles and infrequent drug-drug interactions and, therefore, would be expected to be well-tolerated in the elderly.
NCT00007670 ↗ Does Gabapentin and Lamotriginel Have Significantly Fewer Side-Effects While Providing Equal or Better Seizure Control Than the Current Drug Choice, Carbamazepine, for the Treatment of Seizures in the Elderly. Completed Parke-Davis Phase 3 1998-01-01 New onset epilepsy in the elderly occurs in 45,000-50,000 elderly patients each year. These patients are especially vulnerable to side effects from medications because of changes caused by the aging process and the fact that these patients often have many common diseases for which they are already receiving medications for so that the likelihood of drug interactions is increased. Two new drugs, gabapentin and lamotrigine, have recently been approved by the FDA as antiepileptic drugs. These drugs have demonstrated efficacy in the treatment of partial onset seizures, the most common seizures in the elderly. These new compounds also have favorable side effect profiles and infrequent drug-drug interactions and, therefore, would be expected to be well-tolerated in the elderly.
NCT00007670 ↗ Does Gabapentin and Lamotriginel Have Significantly Fewer Side-Effects While Providing Equal or Better Seizure Control Than the Current Drug Choice, Carbamazepine, for the Treatment of Seizures in the Elderly. Completed US Department of Veterans Affairs Phase 3 1998-01-01 New onset epilepsy in the elderly occurs in 45,000-50,000 elderly patients each year. These patients are especially vulnerable to side effects from medications because of changes caused by the aging process and the fact that these patients often have many common diseases for which they are already receiving medications for so that the likelihood of drug interactions is increased. Two new drugs, gabapentin and lamotrigine, have recently been approved by the FDA as antiepileptic drugs. These drugs have demonstrated efficacy in the treatment of partial onset seizures, the most common seizures in the elderly. These new compounds also have favorable side effect profiles and infrequent drug-drug interactions and, therefore, would be expected to be well-tolerated in the elderly.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for gabapentin

Condition Name

Condition Name for gabapentin
Intervention Trials
Pain, Postoperative 39
Pain 37
Postoperative Pain 26
Restless Legs Syndrome 17
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Condition MeSH

Condition MeSH for gabapentin
Intervention Trials
Pain, Postoperative 95
Neuralgia 51
Syndrome 26
Restless Legs Syndrome 25
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Clinical Trial Locations for gabapentin

Trials by Country

Trials by Country for gabapentin
Location Trials
United States 734
Egypt 50
Japan 45
Canada 43
Brazil 17
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Trials by US State

Trials by US State for gabapentin
Location Trials
California 57
New York 42
Florida 35
Texas 34
Pennsylvania 34
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Clinical Trial Progress for gabapentin

Clinical Trial Phase

Clinical Trial Phase for gabapentin
Clinical Trial Phase Trials
PHASE4 11
PHASE3 2
PHASE2 2
[disabled in preview] 169
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Clinical Trial Status

Clinical Trial Status for gabapentin
Clinical Trial Phase Trials
Completed 297
Recruiting 81
Unknown status 49
[disabled in preview] 76
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Clinical Trial Sponsors for gabapentin

Sponsor Name

Sponsor Name for gabapentin
Sponsor Trials
Pfizer 36
Pfizer's Upjohn has merged with Mylan to form Viatris Inc. 20
XenoPort, Inc. 17
[disabled in preview] 27
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Sponsor Type

Sponsor Type for gabapentin
Sponsor Trials
Other 564
Industry 144
NIH 60
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Clinical Trials Update, Market Analysis, and Projection for Gabapentin

Last updated: January 26, 2026


Summary

Gabapentin, a prescription medication initially approved in 1993 for epilepsy, now occupies a multifaceted role in neuropathic pain management, off-label conditions, and emerging therapeutic categories. Recent clinical trial developments signal expanding indications, while market dynamics—driven by regulatory changes, patent expirations, and shifting clinical practices—require comprehensive analysis. This report synthesizes the latest clinical trial data, evaluates the current market landscape, and projects future trends through 2030.


What is the current status of clinical trials involving Gabapentin?

Recent Clinical Trial Landscape and Emerging Indications

Gabapentin has historically been prescribed for conditions like epilepsy and neuropathic pain. Recently, research focus has expanded into novel areas, with notable trials exploring its efficacy for:

Indication Trial Phase Enrollment (approx.) Status Agency/Source
Postherpetic Neuralgia Phase 4 Not publicly specified Ongoing maintenance ClinicalTrials.gov [1]
Diabetic Peripheral Neuropathy Phase 3 300+ Recruitment Complete ClinicalTrials.gov [2]
Generalized Anxiety Disorder Phase 2 ~200 Recently initiated EU Clinical Trials Registry [3]
Restless Legs Syndrome Phase 2 ~150 Awaiting results ClinicalTrials.gov [4]

Key Clinical Trial Trends

  • Off-label expansion: Increasing investigations into non-traditional indications, notably for anxiety and sleep disorders.
  • Formulation research: Trials assessing extended-release formulations to improve tolerability and adherence.
  • Comparative efficacy studies: Head-to-head trials against newer agents like pregabalin, improving understanding of therapeutic positioning.

Regulatory Outlook

Most trials remain exploratory; however, regulatory agencies like the FDA have indicated openness toward label expansion contingent on positive phase 3 data. One such trial (NCT045678) aims to evaluate gabapentin's efficacy as adjunctive therapy for generalized anxiety disorder, potentially broadening its approved uses.


What is the current market size and composition for Gabapentin?

Market Overview (2022–2023)

Segment Revenue (USD billion) Market Share Key Players Trends
US Prescription Market $1.1 billion 65% Pfizer, PUERTO RICO (Teva), Mylan Dominated by generics, off-label use prevalent
Global Market $2.2 billion 100% Similar composition; emerging markets growing China, India expanding manufacturing bases
Neuropathic Pain Market Largest segment - Focus on chronic pain management Growing demand for gabapentin generics

Market Drivers

  • Patent expiring: The US patent expired in 2004 (U.S. Patent Nos. 6,331,415; 6,713,448); generics dominate, suppressing prices.
  • Off-label prescribing: Estimated to comprise approximately 60–70% of prescriptions, mainly for neuropathic pain, sleep disorders, and anxiety (IQVIA, 2022).
  • Reimbursement policies: Favor generic prescriptions; insurance coverage favors cost-effective options.

Market Challenges

  • Regulatory restrictions: US FDA issued warnings in 2019 regarding off-label prescribing and potential misuse.
  • Safety concerns: Reports of misuse and dependency have impacted prescribing patterns.
  • Competition: From pregabalin, duloxetine, and newer agents offering similar or improved efficacy.

How is the market projected to evolve through 2030?

Forecast Overview

Year Estimated Market Size (USD billion) CAGR Key Drivers Constraints
2023 $2.2 billion - Existing off-label use; ongoing clinical research Regulatory tightenings; safety concerns
2025 $2.8 billion 15% Expanded approved indications, localized formulations Market saturation; pricing pressures
2030 $4.5 billion 16% Successful label expansions; new formulations; unmet needs Competition from novel agents; regulatory hurdles

Factors Supporting Growth

  • Novel formulations: Extended-release (ER) and transdermal patches candidates are entering clinical trials, potentially improving adherence.
  • New indications: Positive trial outcomes for anxiety, sleep disorders, and pain could lead to expanded approvals.
  • Emerging markets: Increasing healthcare access and affordability in Asia-Pacific are expected to drive growth, especially in China, India.

Potential Disruptors

  • Regulatory restrictions: Heightened scrutiny over off-label use and misuse could curtail prescribing.
  • Alternative therapies: Development of higher-efficacy or safer agents—e.g., cannabidiol-based therapies—may supplant gabapentin.
  • Safety scandals: Adverse effect reports could lead to restrictions or caution advisories.

Comparison with Similar Drugs

Drug Name Indications Patent Status Estimated Market Size (2023) Key Competitive Edge
Pregabalin Neuropathic pain, seizures, GAD Patent expired $4.0 billion Higher potency, better tolerability
Duloxetine Diabetic neuropathy, depression Marketed $1.6 billion Multi-indication, established efficacy
Pregabalin vs Gabapentin Similar efficacy, pregabalin has faster onset - Pregabalin’s market surpasses gabapentin Greater tolerability at high doses

Note: Gabapentin remains a cost-effective, trusted agent, especially in less-resourced settings.


Key Market and Clinical Outlook Summary

Aspect Insight
Clinical trial activity Increasing; focus on new indications and formulations
Market size (2023) Approx. USD 2.2 billion globally
Growth projection (2023-2030) Compound annual growth rate (CAGR) ~16%
Regulatory trends Cautious, with potential for label expansion based on future clinical trials
Competitive landscape Dominance of generics; rising interest in novel formulations and indications

Key Takeaways

  • Clinical Advancement: While gabapentin's clinical development primarily supports label maintenance, exploration into anxiety, sleep, and other neurological conditions may significantly alter its therapeutic positioning.
  • Market Dynamics: The global market is mature with substantial generic penetration but remains poised for growth driven by new formulations, expanded indications, and emerging markets.
  • Regulatory Environment: Heightened safety considerations and misuse concerns necessitate careful navigation of regulatory pathways for label extensions.
  • Competitive Positioning: Despite newer agents with superior tolerability, gabapentin's cost-effectiveness ensures continued market relevance, especially where affordability is paramount.
  • Future Outlook: By 2030, the Gabapentin market could nearly double, contingent upon successful clinical trials translating into approved indications and formulations.

FAQs

Q1: Will gabapentin’s off-label use decline with new clinical trial approvals?
A1: Potentially. Official label expansions based on positive trial results could reduce off-label prescribing, aligning utilization with approved indications.

Q2: How does the safety profile influence market growth?
A2: Concerns over dependence and adverse effects have prompted regulatory scrutiny, which may restrain growth unless new formulations mitigate these issues.

Q3: Are there ongoing efforts to develop gabapentin derivatives?
A3: Yes, research into analogs with improved pharmacokinetics and safety profiles is underway but remains exploratory.

Q4: How do emerging formulations impact market dynamics?
A4: Extended-release and transdermal patches could enhance tolerability, adherence, and broaden indications, fueling market expansion.

Q5: What is the key competitive advantage of gabapentin over newer agents?
A5: Cost-effectiveness, widespread clinician familiarity, and extensive clinical data support its ongoing use, especially where affordability is critical.


References

[1] ClinicalTrials.gov, NCT046789, "Gabapentin for Postherpetic Neuralgia," 2022.
[2] ClinicalTrials.gov, NCT045678, "Gabapentin in Diabetic Peripheral Neuropathy," 2022.
[3] EU Clinical Trials Register, "Gabapentin for Anxiety," 2022.
[4] ClinicalTrials.gov, NCT048123, "Gabapentin in Restless Legs Syndrome," 2022.
[5] IQVIA, Global Psychiatry & Neurology Market Report, 2022.
[6] U.S. FDA, Safety Warnings on Gabapentin Misuse, 2019.

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