Clinical trial Recruiting at 8 sites Phase 4 Interventional Ages 18 to 80

Testing a new medication for low back and leg pain relief.

Official title: Efficacy of Modified Release Metaxalone 640 mg in Acute Lumbosacral Musculoskeletal Conditions With Spinal Stenosis and Sciatica

Run by Primus Pharmaceuticals · NCT06157177 · Data updated 2026-11-12

This study is testing a new medication to see if it can help people aged 18 to 80 with back and leg pain feel better.

Quick facts

PhasePhase 4
Study typeInterventional
Ages18 Years to 80 Years
SexAll
Enrollment50 (estimated)
SponsorPrimus Pharmaceuticals
Industry-sponsored
Locations24 sites (Auburn, Alabama and 23 other locations)
StatusRecruiting
StartedNovember 15, 2023
Main results expectedNovember 15, 2026
Study endsNovember 15, 2026
Registry record updatedSeptember 14, 2026
Trial IDNCT06157177 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults aged 18 to 80 experiencing newly occurring low back pain with or without sciatica and a baseline pain score of 6 or higher.

Probably not a fit

Patients currently using other skeletal relaxants, pain relievers, or specific medications like cimetidine or monoamine oxidase inhibitors may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This clinical trial aims to evaluate the effectiveness of a modified metaxalone 640 mg in alleviating pain associated with acute lumbosacral musculoskeletal conditions, specifically sciatica and lumbar spinal stenosis. Participants aged 18 to 80 with newly occurring back or leg pain will be randomly assigned to receive either the active treatment or a placebo in a double-blind manner. The study will assess pain levels, physical activity interference, and sleep disruption through surveys conducted before treatment and one week after. The trial is designed to gather robust data on the medication's efficacy compared to a look-alike substance without active ingredients.

Why it matters

Potential benefit: If successful, this treatment could significantly reduce pain and improve quality of life for patients suffering from acute low back and leg pain.

How similar studies have gone: Other studies have shown promise in using modified formulations of existing medications for pain relief, suggesting potential success for this approach.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* No clinically significant conditions impacting quality or quantity of pain
* Baseline Numeric Pain Scale ≥ 6
* Capable of answering text or email survey reminders
* Low back pain with or without sciatica

Exclusion Criteria:

* Current use of other skeletal relaxants
* Current use of other pain relievers
* Current use of cimetidine or monoamine oxidase inhibitors

Where it's running

  • Robert Levin, MD
    Clearwater, Florida, United States
    Recruiting
  • 5. CZ Rheumatology
    Coral Springs, Florida, United States
    Recruiting
  • Arthritis and Osteoporosis Treatment and ResearchCenter
    Miami, Florida, United States
    Recruiting
  • CZ Rheumatology
    Miami Beach, Florida, United States
    Recruiting
  • Bay Area Rheumatology
    Oldsmar, Florida, United States
    Recruiting
  • Arthritis and Rheumatology Center of MI
    Sterling Heights, Michigan, United States
    Recruiting
Show 18 more locations
  • Cumberland Rheumatology
    Crossville, Tennessee, United States
    Recruiting
  • Heritage Rheumatology & Arthritis Care
    Colleyville, Texas, United States
    Recruiting
  • East Alabama Arthritis Center
    Auburn, Alabama, United States
    Active not recruiting
  • Sean Wollaston, MD
    Valley Village, California, United States
    Active not recruiting
  • Arthritis and Osteoporosis Center
    Aventura, Florida, United States
    Active not recruiting
  • William Sunshine, MD
    Boca Raton, Florida, United States
    Active not recruiting
  • 4. Palm Beach Rheumatology and Wellness
    Jupiter, Florida, United States
    Active not recruiting
  • Family Arthritis Center
    Loxahatchee Groves, Florida, United States
    Active not recruiting
  • Arthritis and Rheumatology Center of South Florida
    Margate, Florida, United States
    Active not recruiting
  • Arthritis and Rheumatic Care Center
    South Miami, Florida, United States
    Active not recruiting
  • Arthritis Research and Treatment Center
    Stockbridge, Georgia, United States
    Active not recruiting
  • Jayashree Sinha, MD 1
    Clovis, New Mexico, United States
    Active not recruiting
  • Carolina Rheumatology
    Fayetteville, North Carolina, United States
    Active not recruiting
  • Ohio Arthritis and Osteoporosis Center of Southwest Ohio
    Springboro, Ohio, United States
    Active not recruiting
  • Integrative Rheumatology of South Texas
    Harlingen, Texas, United States
    Active not recruiting
  • Southwest Research Group
    Mesquite, Texas, United States
    Active not recruiting
  • DFW Rheumatology
    Red Oak, Texas, United States
    Active not recruiting
  • Northern Virginia Center for Arthritis
    Annandale, Virginia, United States
    Active not recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.