D-cycloserine: A Novel Treatment for Gulf War Illness (GWDCS) (GWDCS)

August 17, 2026 updated by: RosemaryToomey, Boston University Charles River Campus

D-cycloserine: A Novel Treatment for Gulf War Illness

The purpose of this study is to investigate the efficacy of d-cycloserine (DCS) treatment for Gulf War Illness (GWI). Gulf War veterans with Gulf War Illness experience numerous chronic health symptoms, including cognition and fatigue, which reduces their quality of life. Gulf War veterans are in urgent need of novel treatment plans to tackle elusive symptomatology of Gulf War Illness. By using the literature of previous studies, the investigators have chosen to investigate d-cycloserine as a possible candidate for treating GWI, specifically cognitive symptoms. DCS has been shown to reduce neuroinflammation, regulate glutamate levels, and improve synaptic functioning in key areas of the brain.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Our study is a pilot study for the novel treatment of d-cycloserine to treat GWI. Our study will consist of two experimental groups of equal size (n=28): DCS treatment group and a placebo group. Participants will be randomized into either group; with a double blind study design. Participants will be instructed to self-administer their treatment pills once per day for 28 days. There will be a total of 6 study visits that will include medical and neuropsychological assessment. The first visit will be for establishing eligibility and baseline functioning. Three visits (visits 2-4) will occur during the medication trial (day 1, day 2 and two weeks into medication/placebo). Visit 5 will occur around the time medication/placebo is finished. Visit 6 (follow up) will occur one month after medication/placebo is complete.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
22

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.
  • Name: Allison Coyne, B.S.
  • Phone Number: 617-358-3048
  • Email: afcoyne@bu.edu

Study Contact Backup

  • Name: Rosemary Toomey, Ph.D.
  • Phone Number: 617-358-2037
  • Email: toomey@bu.edu

Study Locations

  • United States
    • Massachusetts
      • Boston, Massachusetts, United States, 02215
        • Boston University

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

43 years to 85 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Veterans of the 1991 Gulf War, male or female
  • Physical examination and laboratory findings within normal limits
  • Willingness and ability to participate in the informed consent process and comply with study protocols
  • Symptom criteria: Meets Gulf War Illness criteria with the cognitive symptom domain being present. Veteran does not have medical exclusions for Gulf War Illness

Exclusion Criteria:

  • Veteran lacks the capacity to provide consent during the informed consent process
  • Veteran has the one of the following medical exclusion conditions and/or has been active or received treatment within the past 5 years: Cancer (except nonmelanoma skin cancer), diabetes (not well managed), seizure disorder, heart disease (except hypertension), liver disease, kidney disease, Lupus, multiple sclerosis, stroke, chronic infectious disease, immune disorder/immunosuppression
  • Veteran has a history of a major psychiatric or central nervous system disorder that can affect cognitive function (ie. epilepsy, brain tumor, Parkinson's Disease)
  • Veteran has been hospitalized in the past 5 years for depression, PTSD, alcohol or drug dependence
  • Veteran has current suicidal ideation or current alcohol or drug dependence
  • Pregnant women, lactating women, women who are breastfeeding, or women of childbearing potential who are not using medically accepted forms of contraception
  • Veteran is active duty personnel

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Active Comparator: D-cycloserine (DCS)
Participants randomized to this arm will receive DCS daily for 4 weeks to compare the efficacy of the novel therapeutic approach of DCS in improving cognitive functioning in Gulf War (GW) veterans with Guld War Illness (GWI).
Drug: D-cycloserine
100mg of DCS will be administered orally in pill form daily for 4 weeks
Other Names:
  • DCS
Placebo Comparator: Placebo
Participants randomized to this arm will receive a placebo daily for 4 weeks to provide a control group for the novel therapeutic approach of DCS in improving cognitive functioning in GW veterans with GWI.
Drug: Placebo
A placebo will be administered orally daily for 4 weeks
Other Names:
  • Sugar pill

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Immediate Recall Using the Logical Memory Test I
Time Frame: 8 weeks
The Logical Memory Test I will be used to evaluate immediate auditory memory and ability to recall details of orally presented stories right after hearing them. Two stories will be presented and each story contains 25 standard memory details (story units). A participant receives 1 point for every detail they successfully recall. Scores can range from 0 to 50.
8 weeks
Delayed Recall Using the Logical Memory Test II
Time Frame: 8 weeks
The Logical Memory Test II will be used to evaluate delayed auditory memory and ability to recall details of orally presented stories after a delay of 20-30 minutes after hearing them. Two stories will be presented and each story contains 25 standard memory details (story units). A participant receives 1 point for every detail they successfully recall. Scores can range from 0 to 50.
8 weeks

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Overall Psychological Distress or Negative Mood State
Time Frame: 8 weeks
The Total Mood Disturbance (TMD) score is a comprehensive metric used in psychology and sports science to quantify an individual's overall psychological distress or negative mood state. It is calculated directly from the 65 item Profile of Mood States (POMS) questionnaire where each item is scored on a 5-point Likert scale: 0 = Not at all, 1 = A little, 2 = Moderately, 3 = Quite a lot, 4 = Extremely. . The TMD score combines multiple subscales of mood by summing negative emotional dimensions and subtracting positive ones. Score ranges from -32 to 200. Higher Scores indicate a greater degree of mood disturbance, affective distress, or psychological stress.
8 weeks
Transient Emotional States and Mood Fluctuations Over Time
Time Frame: 8 weeks
The Profile of Mood States (POMS) is a standard, validated psychological test used to measure transient emotional states and mood fluctuations over time. It consists of 65 words or statements that describe different feelings and emotions. Each item is scored on a 5-point Likert scale: 0 = Not at all, 1 = A little, 2 = Moderately, 3 = Quite a lot, 4 = Extremely. Scores can range from 0-60.
8 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Boston University Charles River Campus

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
United States Department of Defense

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Rosemary Toomey, Ph.D., Boston University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
October 1, 2015

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
September 15, 2019

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
September 15, 2019

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
November 29, 2016

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
December 2, 2016

First Posted (Estimated)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
December 6, 2016

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
September 9, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 17, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
August 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • W81XWH-15-1-0588 (Other Grant/Funding Number: Department of Defense)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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