Efficacy and Safety of NYX-2925 in Subjects With Fibromyalgia
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The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. |
ClinicalTrials.gov Identifier: NCT04147858 |
Recruitment Status :
Completed
First Posted : November 1, 2019
Last Update Posted : October 27, 2022
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Condition or disease | Intervention/treatment | Phase |
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Fibromyalgia | Drug: NYX-2925 Drug: Placebo | Phase 2 |
This is a randomized, double-blind, placebo-controlled study to assess the efficacy and safety of NYX-2925 in subjects with fibromyalgia.
This 13- to 16-week study will include a 1- to 4-week Screening Period followed by a 12-week double-blind, randomized, placebo-controlled Treatment Period.
Study Type : | Interventional (Clinical Trial) |
Actual Enrollment : | 305 participants |
Allocation: | Randomized |
Intervention Model: | Parallel Assignment |
Masking: | Triple (Participant, Investigator, Outcomes Assessor) |
Masking Description: | Randomization algorithm, randomization allocation, allocation to study drug or placebo. |
Primary Purpose: | Treatment |
Official Title: | A Randomized, Double-Blind, Placebo-Controlled Study to Assess the Efficacy and Safety of NYX-2925 in Subjects With Fibromyalgia |
Actual Study Start Date : | November 12, 2019 |
Actual Primary Completion Date : | June 16, 2022 |
Actual Study Completion Date : | June 16, 2022 |

Arm | Intervention/treatment |
---|---|
Experimental: NYX-2925 50 mg
NYX-2925 50 mg administered orally.
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Drug: NYX-2925
NYX-2925 administered orally |
Experimental: NYX-2925 100 mg
NYX-2925 100 mg administered orally.
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Drug: NYX-2925
NYX-2925 administered orally |
Placebo Comparator: Placebo
Placebo administered orally.
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Drug: Placebo
Placebo administered orally |
- Change in the mean Numerical Rating Scale (NRS) score [ Time Frame: Week 12 ]Change from baseline to Week 12 in the weekly mean of the daily Numerical Rating Scale (NRS) score assessing average pain intensity in the past 24 hours
- Patient Global Impression of Change (PGI-C) [ Time Frame: Week 12 ]Percentage of subjects "much improved" or "very much improved" on the Patient Global Impression of Change (PGI-C) at Week 12
- Daily Sleep Interference (DSIS) score [ Time Frame: Week 12 ]Change from baseline in the weekly mean of the Daily Sleep Interference Scale (DSIS) scores at Week 12
- Percentage of subjects achieving ≥30% pain reduction [ Time Frame: Week 12 ]Percentage of subjects achieving ≥30% reduction from baseline in the weekly mean NRS average pain intensity at Week 12
- Percentage of subjects achieving ≥50% pain reduction [ Time Frame: Week 12 ]Percentage of subjects achieving ≥50% reduction from baseline in the weekly mean NRS average pain intensity at Week 12
- Fibromyalgia Impact Questionnaire-Revised (FIQR) score [ Time Frame: Week 12 ]Change from baseline to Week 12 in the Fibromyalgia Impact Questionnaire - Revised (FIQR) score
- Patient Reported Outcomes Measurement Information System - Fibromyalgia (PROMIS-FM) sleep disturbance score [ Time Frame: Week 12 ]Change from baseline to Week 12 in the PROMIS-FM sleep disturbance score
- Patient Reported Outcomes Measurement Information System - Fibromyalgia (PROMIS-FM) fatigue profile score [ Time Frame: Week 12 ]Change from baseline to Week 12 in the PROMIS-FM fatigue profile score
- Patient Reported Outcomes Measurement Information System - Fibromyalgia (PROMIS-FM) physical function score [ Time Frame: Week 12 ]Change from baseline to Week 12 in the PROMIS-FM physical function score
- Cumulative response (percent reduction from baseline) in weekly mean NRS [ Time Frame: Week 12 ]Cumulative response (percent reduction from baseline) in the weekly mean NRS average pain intensity at Week 12
- Use of rescue medication [ Time Frame: Week 12 ]Use of rescue medication, including the proportion of subjects using rescue medication, the frequency and amount used
- Change in the mean NRS score at each week [ Time Frame: Week 1 - Week 12 ]Change from baseline in the weekly mean of the daily Numerical Rating Scale (NRS) at each week from Week 1 through Week 12

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.
Ages Eligible for Study: | 18 Years to 75 Years (Adult, Older Adult) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | No |
Inclusion criteria:
- Informed consent
- Subject has a history of fibromyalgia that was diagnosed >1 year prior to screening and reports at least moderate pain over the last week
- Stable protocol allowed medication and other therapies during the study
- Agrees to use highly effective birth control during the study
- Has not participated in an interventional study for at least 30 days and agrees not to participate in another interventional study during the study
Exclusion Criteria:
- Pain due to other conditions or diseases that would complicate participation in the study or pain reporting
- Current or historical serious medical conditions
- Prior participation in NYX-2925 clinical trial

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04147858
United States, Arizona | |
Aptinyx Clinical Site | |
Phoenix, Arizona, United States, 85012 | |
United States, California | |
Aptinyx Clinical Site | |
Culver City, California, United States, 90230 | |
Aptinyx Clinical Site | |
Fresno, California, United States, 93710 | |
Aptinyx Clinical Site | |
Orange, California, United States, 92868 | |
Aptinyx Clinical Site | |
Redlands, California, United States, 92374 | |
Aptinyx Clinical Site | |
Temecula, California, United States, 92591 | |
Aptinyx Clinical Site | |
Torrance, California, United States, 90502 | |
United States, Florida | |
Aptinyx Clinical Site | |
Fernandina Beach, Florida, United States, 32034 | |
Aptinyx Clinical Site | |
Jacksonville, Florida, United States, 32224 | |
Aptinyx Clinical Site | |
Jacksonville, Florida, United States, 32256 | |
Aptinyx Clinical Site | |
Lady Lake, Florida, United States, 32159 | |
Aptinyx Clinical Site | |
Miami, Florida, United States, 33165 | |
Aptinyx Clinical Site | |
Orlando, Florida, United States, 32801 | |
Aptinyx Clinical Site | |
Palmetto Bay, Florida, United States, 33157 | |
Aptinyx Clinical Site | |
Winter Park, Florida, United States, 32789 | |
United States, Georgia | |
Aptinyx Clinical Site | |
Alpharetta, Georgia, United States, 30022 | |
United States, Illinois | |
Aptinyx Clinical Site | |
Chicago, Illinois, United States, 60607 | |
Aptinyx Clinical Site | |
Flossmoor, Illinois, United States, 60422 | |
Aptinyx Clinical Site | |
Gurnee, Illinois, United States, 60031 | |
Aptinyx Clinical Site | |
Skokie, Illinois, United States, 60076 | |
United States, Indiana | |
Aptinyx Clinical Site | |
Evansville, Indiana, United States, 47714 | |
United States, Iowa | |
Aptinyx Clinical Site | |
West Des Moines, Iowa, United States, 50265 | |
United States, Kansas | |
Aptinyx Clinical Site | |
Newton, Kansas, United States, 67114 | |
Aptinyx Clinical Site | |
Prairie Village, Kansas, United States, 66208 | |
Aptinyx Clinical Site | |
Wichita, Kansas, United States, 67205 | |
United States, Massachusetts | |
Aptinyx Clinical Site | |
Roslindale, Massachusetts, United States, 02131 | |
United States, Missouri | |
Aptinyx Clinical Site | |
Hazelwood, Missouri, United States, 63042 | |
United States, Nebraska | |
Aptinyx Clinical Site | |
Omaha, Nebraska, United States, 68114 | |
United States, Nevada | |
Aptinyx Clinical Site | |
Las Vegas, Nevada, United States, 89102 | |
United States, New York | |
Aptinyx Clinical Site | |
Brooklyn, New York, United States, 11235 | |
Aptinyx Clinical Site | |
New York, New York, United States, 10017 | |
Aptinyx Clinical Site | |
New York, New York, United States, 10036 | |
Aptinyx Clinical Site | |
Staten Island, New York, United States, 10312 | |
Aptinyx Clinical Site | |
Williamsville, New York, United States, 14221 | |
United States, Ohio | |
Aptinyx Clinical Site | |
Cincinnati, Ohio, United States, 45219 | |
United States, Oklahoma | |
Aptinyx Clinical Site | |
Oklahoma City, Oklahoma, United States, 73106 | |
United States, Pennsylvania | |
Aptinyx Clinical Site | |
Duncansville, Pennsylvania, United States, 16635 | |
United States, Tennessee | |
Aptinyx Clinical Site | |
Memphis, Tennessee, United States, 38119 | |
United States, Texas | |
Aptinyx Clinical Site | |
Austin, Texas, United States, 78737 | |
Aptinyx Clinical Site | |
Houston, Texas, United States, 77077 | |
United States, Virginia | |
Aptinyx Clinical Site | |
Danville, Virginia, United States, 24541 | |
United States, Washington | |
Aptinyx Clinical Site | |
Bellevue, Washington, United States, 98007 |
Responsible Party: | Aptinyx |
ClinicalTrials.gov Identifier: | NCT04147858 |
Other Study ID Numbers: |
NYX-2925-2005 |
First Posted: | November 1, 2019 Key Record Dates |
Last Update Posted: | October 27, 2022 |
Last Verified: | October 2022 |
Individual Participant Data (IPD) Sharing Statement: | |
Plan to Share IPD: | No |
Studies a U.S. FDA-regulated Drug Product: | Yes |
Studies a U.S. FDA-regulated Device Product: | No |
Fibromyalgia Myofascial Pain Syndromes Muscular Diseases Musculoskeletal Diseases |
Rheumatic Diseases Neuromuscular Diseases Nervous System Diseases |