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ClinicalTrials.gov public records Last synced Oct 22, 2026, 4:18 PM EDT

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Showing 1–4 of 4 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: metaxalone m640 mg Clear all
Not yet recruiting Phase 4 Interventional Accepts healthy volunteers

Testing Healthy Participants for Drowsiness After Single Dosing of Two Different Doses of Muscle Relaxer

NCT07801066
View directory record Official record
Conditions
Healthy Participants
Interventions
Metaxalone 640 mg, Metaxalone 800 MG
Drug
Lead sponsor
Primus Pharmaceuticals
Industry
Eligibility
18 Years to 55 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 16, 2026 · Synced Oct 22, 2026, 4:18 PM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

Efficacy of M640 in Acute Lumbosacral Musculoskeletal Conditions.

NCT06157177
View directory record Official record
Conditions
Sciatica Acute, Lumbar Spinal Stenosis
Interventions
Metaxalone 640 mg Oral Tablet
Drug
Lead sponsor
Primus Pharmaceuticals
Industry
Eligibility
18 Years to 80 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
24
States / cities
Auburn, Alabama • Valley Village, California • Aventura, Florida + 21 more
Source: ClinicalTrials.gov public record
Updated Sep 14, 2026 · Synced Oct 22, 2026, 4:18 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Assess the Effect of Metaxalone 640 mg (M640) Compared to Tizanidine 8 mg on Truck Driving Ability and Cognition

NCT06382662
View directory record Official record
Conditions
Cognitive Impairment
Interventions
metaxalone m640 mg, tizanidine 8mg
Drug
Lead sponsor
Primus Pharmaceuticals
Industry
Eligibility
18 Years to 65 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Peoria, Arizona
Source: ClinicalTrials.gov public record
Updated Sep 11, 2026 · Synced Oct 22, 2026, 4:18 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Study to Assess Drowsiness, Cognition, Fall Risk After Metaxalone 640 mg and Metaxalone 800 mg

NCT06348303
View directory record Official record
Conditions
Healthy Participants
Interventions
Metaxalone m640 mg oral tablet, Metaxalone 800 mg oral tablet
Drug
Lead sponsor
Primus Pharmaceuticals
Industry
Eligibility
18 Years to 55 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Aug 7, 2025 · Synced Oct 22, 2026, 4:18 PM EDT