A Study to Evaluate the Safety and Tolerability of SAGE-718 in Participants With Parkinson's Disease Mild Cognitive Impairment (PD-MCI)

September 11, 2025 updated by: Supernus Pharmaceuticals, Inc.

An Open-Label Evaluation of the Safety and Tolerability of SAGE-718 in Participants With Parkinson's Disease Mild Cognitive Impairment

The primary purpose of this two-part study was to evaluate the safety and tolerability of SAGE-718 and its effects on cognitive, neuropsychiatric, and motor symptoms in participants with Parkinson's disease mild cognitive impairment (PD-MCI).

Study Overview

Status

Status

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

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.

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 (Actual)

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.
18

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 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • California
      • Long Beach, California, United States, 90806
        • Sage Investigational Site
    • Florida
      • Port Charlotte, Florida, United States, 33980
        • Sage Investigational Site
      • West Palm Beach, Florida, United States, 33407
        • Sage Investigational Site
    • Illinois
      • Chicago, Illinois, United States, 60612
        • Sage Investigational Site

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

50 years to 75 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Meet the following criteria for PD-MCI: Have a confirmed diagnosis of idiopathic PD according to 2015 Movement Disorder Society (MDS) clinical diagnostic criteria; Meet MDS Task Force Criteria for MCI in PD.
  2. Have a score of 20 to 25 (inclusive) on the Montreal Cognitive Assessment (MoCA) at Screening.
  3. Meet criteria for Hoehn & Yahr Stage I to III (mild to moderate motor severity) at Screening.
  4. Have stable motor symptoms for at least 4 weeks prior to screening, in the opinion of the investigator.

Exclusion Criteria:

  1. Have a diagnosis of dementia of any etiology, including but not limited to: Dementia associated with PD (probable or possible), Dementia with Lewy Bodies, Alzheimer's Dementia, and Vascular Dementia.
  2. Have any indication of parkinsonism other than idiopathic PD.
  3. In the opinion of the investigator, be experiencing unpredictable fluctuations in motor and/or nonmotor symptoms associated with PD.
  4. Have an ongoing central nervous system condition other than idiopathic PD, including active neurologic and/or nonremitted psychiatric disorders, in the opinion of the investigator.
  5. Have a history of brain surgery, deep brain stimulation, a significant head injury causing loss of consciousness greater than 30 minutes, or hospitalization due to a brain injury.
  6. Have experienced significant psychotic symptoms within the past 3 months, including those associated with PD medications, as determined by the investigator.

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: Non-Randomized
  • Interventional Model: Sequential Assignment
  • Masking: None (Open Label)

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.
Experimental: Part A: SAGE-718 3 mg
Participants received SAGE-718 3 milligrams (mg) tablets, once daily with food in the morning for 14 days.
Drug: SAGE-718
Oral tablets.
Experimental: Part B: SAGE-718 3 mg
Participants received SAGE-718 3 mg tablets, once daily with food in the morning for 28 days.
Drug: SAGE-718
Oral tablets.

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
Part A: Percentage of Participants With at Least One Treatment-Emergent Adverse Event (TEAE)
Time Frame: From first dose of study drug up to 28 days
An adverse event (AE) was any untoward medical occurrence in a participant administered with a pharmaceutical product and that does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign, symptom, or disease temporally associated with the use of an IP whether or not related to the product. An AE can include any undesirable medical condition, even if no study treatment has been administered. TEAEs were defined as an AE with an onset date on or after the date of the first dose of IP or any worsening of a pre-existing medical condition/AE with onset after the start of IP and throughout the study. Percentages are rounded off to the nearest single decimal.
From first dose of study drug up to 28 days
Part B: Percentage of Participants With at Least One Treatment-Emergent Adverse Event (TEAE)
Time Frame: From first dose of study drug up to 42 days
An AE was any untoward medical occurrence in a participant administered with a pharmaceutical product and that does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign, symptom, or disease temporally associated with the use of an IP whether or not related to the product. An AE can include any undesirable medical condition, even if no study treatment has been administered. TEAEs were defined as an AE with an onset date on or after the date of the first dose of IP or any worsening of a pre-existing medical condition/AE with onset after the start of IP and throughout the study. Percentages are rounded off to the nearest single decimal.
From first dose of study drug up to 42 days

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
Part A and B: Percentage of Participants With Clinically Significant Changes in Vital Sign Measurements
Time Frame: From first dose of study drug up to 28 days for Part A, and up to 42 days for Part B
Vital signs included temperature, respiratory rate, heart rate (supine and standing), systolic blood pressure (supine and standing) and diastolic blood pressure (supine and standing). Percentage of participants with clinically significant change in vital signs measurements which were deemed clinically significant by the investigator were reported.
From first dose of study drug up to 28 days for Part A, and up to 42 days for Part B
Part A and B: Percentage of Participants With Clinically Significant Changes in Laboratory Assessments
Time Frame: From first dose of study drug up to 28 days for Part A, and up to 42 days for Part B
Laboratory tests assessments included hematology, biochemistry, coagulation and urinalysis. Percentage of participants with clinically significant change in laboratory assessments which were deemed clinically significant by the investigator were reported.
From first dose of study drug up to 28 days for Part A, and up to 42 days for Part B
Part A and B: Percentage of Participants With Clinically Significant Changes in Electrocardiogram (ECG) Measurements
Time Frame: From first dose of study drug up to 28 days for Part A, and up to 42 days for Part B
Supine 12-lead ECGs were performed in triplicate and the standard intervals (heart rate, PR interval, QRS duration, QT interval, and corrected QT interval by Fridericia [QTcF]). Percentage of participants with clinically significant change in ECG measurements which were deemed clinically significant by the investigator were reported.
From first dose of study drug up to 28 days for Part A, and up to 42 days for Part B
Part A and B: Percentage of Participants With a Response of 'Yes' to Any Suicidal Ideation or Suicidal Behaviors Item Assessed Using the Columbia Suicide Severity Rating Scale (C-SSRS)
Time Frame: From first dose of study drug up to 28 days for Part A, and up to 42 days for Part B
The C-SSRS scale consisted of a baseline evaluation (at screening) that assessed the lifetime experience of participants with suicidal ideation (SI) and suicidal behavior (SB) and a postbaseline evaluation that focused on suicidality since the last study visit. The C-SSRS included "yes" or "no"' responses for assessment of suicidal ideation and behavior as well as numeric ratings for the severity of ideation, if present (from 1 to 5, with 5 being the most severe). The C-SSRS SI items involved wish to be dead, non-specific active suicidal thoughts, active SI with any methods, active SI with some intent and active SI with a specific plan. The C-SSRS SB items involved preparatory acts or behavior, aborted attempt, interrupted attempt, actual attempt (non-fatal) and completed suicide. Percentage of participants with a response of 'yes' are reported for both suicidal ideation and behavior in this OM.
From first dose of study drug up to 28 days for Part A, and up to 42 days for Part B

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.
Supernus Pharmaceuticals, 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.
July 31, 2020

Primary Completion (Actual)

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.
March 25, 2022

Study Completion (Actual)

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.
March 25, 2022

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).
July 15, 2020

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.
July 15, 2020

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.
July 17, 2020

Study Record Updates

Last Update Posted (Estimated)

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 15, 2025

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.
September 11, 2025

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.
July 1, 2023

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.
  • 718-CNP-201

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

Data sharing will be consistent with the results submission policy of ClinicalTrials.gov.

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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