Healthy Participants Will Take One Dose of a Drug After Eating a Meal, Then Test for Drowsiness and Fall Risk With Brain Wave Monitoring Throughout the Testing. Participants Will Take a Second Dose of the Drug With the Same Testing.

August 28, 2026 updated by: Primus Pharmaceuticals

A Prospective, Randomized, Single-blind, Study to Assess Drowsiness, Cognition, Fall Risk, and Electroencephalographic (EEG) Dynamics Following Oral Metaxalone Tablets 640 mg (M640) Versus Metaxalone 800 mg in Healthy Participants: A Bootstrap Validation.

Healthy participants will take one dose of a drug after eating a meal. When the drug is at the highest level in their blood, testing for drowsiness and the risk of falling will take place. Brain wave monitoring known as an EEG will take place throughout the testing. Participants will take a second dose of the drug with the same testing one week later.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

20

Phase

  • Phase 4

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 Backup

Study Locations

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

Ages Eligible for Study

  • Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Healthy adults aged 18 to 55 years old
  • Weigh at least 120 pounds
  • Medically healthy
  • Able to sign and date informed consent form

Exclusion Criteria:

  • Current use of any medications known to affect the sleep-wake cycle
  • Sleep disorder diagnosis
  • Positive urine test for drugs
  • Known history of alcohol use disorder
  • Having a history of cognitive disorders, depression, schizophrenia, panic disorder, or dementia
  • Having difficulty eating high fat meal
  • Participants who are pregnant, nursing or intending to become pregnant during the period of study.
  • Blood Pressure > 160/110 or <90/50 mmHg.
  • Heart Rate >100 or < 50/ beats per minute.
  • Having a history of seizure disorder or epilepsy.

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: Basic Science
  • Allocation: Randomized
  • Interventional Model: Crossover Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Active metaxalone m640 mg
One dose administered after a standard meal with testing Baseline dose to time of maximum concentration (Tmax)
Drug: Metaxalone 640 mg
Dose micronized 640 mg
Active Comparator: Active metaxalone 800 mg
One dose administered after a standard meal with testing Baseline dose to time of maximum concentration (Tmax)
Drug: Metaxalone 800 MG
The dose is 800 mg

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Change from baseline to approximately 4 hours post-dose, in mean reaction time to a stimulus as measured in milliseconds by the Reaction Time Test (RTT)
Time Frame: Baseline dose to four (4 ) hours post-dose
Baseline dose to four (4 ) hours post-dose
Change from baseline to approximately 4 hours post-dose of delayed response exceeding a predefined threshold >300 ms as measured by the Reaction Time Test (RTT)
Time Frame: Baseline dose to approximately 4 hours post-dose
Baseline dose to approximately 4 hours post-dose

Collaborators and Investigators

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

Sponsor

Primus Pharmaceuticals

Collaborators

AMR Clinical

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 (Estimated)

September 15, 2026

Primary Completion (Estimated)

January 15, 2027

Study Completion (Estimated)

January 15, 2027

Study Registration Dates

First Submitted

August 28, 2026

First Submitted That Met QC Criteria

August 28, 2026

First Posted (Actual)

September 3, 2026

Study Record Updates

Last Update Posted (Actual)

September 3, 2026

Last Update Submitted That Met QC Criteria

August 28, 2026

Last Verified

August 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • PMMD-02

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

No plan for publication at this time.

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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