Study Evaluating the Efficacy and Safety of RAP-219 in Adult Participants With Focal Seizures FOCUS-1 (FOCUS 1)

August 31, 2026 updated by: Rapport Therapeutics Inc.

A Phase 3, Randomized, Double-blind, Placebo-controlled Study to Evaluate the Efficacy and Safety of RAP-219 in Adult Participants With Focal Seizures

This is a clinical research study for an investigational drug called RAP-219 in adult participants with focal seizures. This study is being conducted to determine if RAP-219 is safe and effective in reducing focal seizure frequency.

Study Overview

Status

Status

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

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

Approximately 333 subjects will be randomized into one of two active treatment groups or placebo in a 1:1:1 randomization ratio (High Dosage, Medium Dosage and Placebo). After completing the Double-blind Treatment Period, participants will either transition into the RAP-219-FOS-901 long-term safety (open-label extension) study or enter the 8-week post-treatment Follow-up Period of this study.

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 (Estimated)

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.
333

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 3

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.

Study Locations

  • United States
    • California
      • Palmdale, California, United States, 91324
        • Recruiting
        • Amicis Research Center
    • Florida
      • Gulf Breeze, Florida, United States, 32561
        • Recruiting
        • Panhandle Research and Medical Clinic, LLC
    • Georgia
      • Atlanta, Georgia, United States, 30329
        • Recruiting
        • Emory Brain Health Center
    • Idaho
      • Boise, Idaho, United States, 83702
        • Recruiting
        • Consultants in Epilepsy & Neurology, PLLC
    • Indiana
      • Fort Wayne, Indiana, United States, 46804
        • Recruiting
        • Indiana University Health Fort Wayne Neurology
    • Maryland
      • Bethesda, Maryland, United States, 20817
        • Recruiting
        • Mid-Atlantic Epilepsy and Sleep Center
    • New Jersey
      • Hackensack, New Jersey, United States, 07601
        • Recruiting
        • Northeast Regional Epilepsy Group
    • North Carolina
      • Asheville, North Carolina, United States, 28806
        • Recruiting
        • Asheville Neurology Specialists
    • Ohio
      • Cleveland, Ohio, United States, 44109
        • Recruiting
        • Cleveland Clinic
    • Pennsylvania
      • Philadelphia, Pennsylvania, United States, 19107
        • Recruiting
        • Thomas Jefferson University
    • Virginia
      • Richmond, Virginia, United States, 23236
        • Recruiting
        • Neurological Associates

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

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Age 18 - 75
  2. BMI 18-45 kg/m2
  3. Diagnosis of focal epilepsy for ≥24 months prior to Visit 1
  4. Report from at least 1 brain MRI or CT scan and 1 EEG study, each completed within 10 years prior to Visit 1, consistent with focal epilepsy diagnosis
  5. Concomitant use of between 1 and 3, inclusive, antiseizure medication(s) ASM(s) as maintenance, not including rescue or pro re nata (PRN) ASMs
  6. Ability to keep accurate daily focal seizure records using an e-diary

Exclusion Criteria:

  1. Known hypersensitivity or prior exposure to RAP-219.
  2. Unstable or uncontrolled serious medical, neurologic (other than focal epilepsy), or psychiatric condition that is ongoing or considered likely to recur
  3. Anticipated need for surgery during the study period

  4. Medical history of any of the following:

    1. generalized epilepsy
    2. focal preserved consciousness without observable manifestations (also known as focal aware nonmotor) as the participant's only seizure type
    3. psychogenic nonepileptic seizure (PNES)
    4. status epilepticus or seizure clusters (when individual seizures cannot be counted) within 12 months prior to Visit 1 (Day -56).
    5. epilepsy surgery within 12 months prior to Visit 1 (Day -56).
  5. Participation in another clinical study of an investigational product within 12 weeks or 5 half-lives of this other investigational product

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: Quadruple

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.
Placebo Comparator: Placebo
Inert comparator matching the active treatment
Other: Placebo
Matching placebo tablets administered orally daily
Experimental: Active Arm- High Dose
RAP-219 daily tablets administered orally
Drug: RAP-219
RAP-219 high dose tablets administered orally daily
Drug: RAP-219
RAP-219 medium dose tablets administered orally daily
Experimental: Active Arm- Medium Dose
RAP-219 daily tablets administered orally
Drug: RAP-219
RAP-219 high dose tablets administered orally daily
Drug: RAP-219
RAP-219 medium dose tablets administered orally daily

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
Median Percent Change in Seizure Frequency
Time Frame: End of double-blind treatment period (end of week 14) vs Baseline
Median percent change in seizure frequency and ≥ 50% seizure frequency reduction responder rates:
End of double-blind treatment period (end of week 14) vs Baseline

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
≥50% seizure frequency reduction responder rates
Time Frame: End of double-blind treatment period (end of week 14) vs Baseline.
Proportion of participants with at least 50% reduction from baseline in seizure frequency after treatment with RAP-219 compared with placebo
End of double-blind treatment period (end of week 14) vs Baseline.
Longest Seizure Free Interval
Time Frame: Across the entire 14-week double-blind treatment period
To evaluate the longest seizure-free interval after treatment with RAP-219 compared with placebo
Across the entire 14-week double-blind treatment period

Other Outcome Measures

Other Outcome Measures

For clinical trials, a planned measurement described in the protocol that is used to determine the effect of an intervention/treatment on participants. For observational studies, a measurement or observation that is used to describe patterns of diseases or traits, or associations with exposures, risk factors, or treatment. Types of outcome measures include primary outcome measure and secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
RAP-219 safety and tolerability
Time Frame: From Visit 1 through End of Study, on average Week 22.
incidence of treatment-emergent adverse events (TEAEs), serious adverse events (SAEs), and AEs leading to discontinuation
From Visit 1 through End of Study, on average Week 22.

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.
Rapport Therapeutics Inc.

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 (Actual)

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.
June 5, 2026

Primary Completion (Estimated)

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.
July 1, 2029

Study Completion (Estimated)

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 1, 2029

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).
April 16, 2026

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.
April 30, 2026

First Posted (Actual)

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.
May 4, 2026

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 1, 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 31, 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.
  • RAP-219-FOS-301

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

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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