A Study to Evaluate Safety, Tolerability, and PK of DA-7503 in Healthy Adult and Elderly Participants

May 19, 2026 updated by: Dong-A ST Co., Ltd.

A Double-blind, Placebo-controlled, Randomized, Phase 1 Study to Evaluate Safety, Tolerability, and Pharmacokinetics of Orally Administered DA-7503 After Single and Multiple Ascending Dose Regimens in Healthy Adult and Elderly Participants

This is a double-blind, placebo-controlled, randomized, phase 1 study to evaluate safety, tolerability, and pharmacokinetics of orally administered DA-7503 after single and multiple ascending dose regimens in healthy adult and elderly participants

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.
90

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 1

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

  • South Korea
      • Seoul, South Korea
        • Seoul National University Hospital

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

Yes

Description

Inclusion Criteria:

  1. Healthy volunteers(Age: 19~55 years, 65~85 years)
  2. Body weight≥50.0kg, 18.0kg/m²≤BMI≤30.0kg/m²

Exclusion Criteria:

  1. Clinically significant Medical History
  2. Allergy or Drug hypersensitivity
  3. AST, ALT, Total billurbin > Upper Normal Range*1.5, eGFR<60mL/min/1.73m²
  4. Positive for serum test results(hepatitis B, hepatitis C, HIV, syphilis test)
  5. Heavy smoker(more than 10 cigarettes/day)
  6. Heavy caffeine intake(more than 5 units/day)
  7. Heavy alcohol intake(more than 210g/week)

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: Double

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: [Single dose] DA-7503
6 subjects in each Cohort(Cohort 1-6)
Drug: DA-7503 Single dose
Oral administration for once; Dose strength is different for each cohort(Cohort 1, 2, 3, 4, 5 and 6).
Placebo Comparator: [Single dose] Placebo
2 subjects in each Cohort(Cohort 1-6)
Drug: Placebo Single dose
Oral administraion for once.
Experimental: [Multiple dose] DA-7503
6 subjects in each Cohort(Cohort 1-5)
Drug: DA-7503 Multiple dose
Oral administration once daily for 7 days; Dose strength or target volunteer is different for each cohort(Cohort 1, 2, 3, 4 and 5)
Placebo Comparator: [Multiple dose] Placebo
2 subjects in each Cohort(Cohort 1-5)
Drug: Placebo Multiple dose
Oral administration once daily for 7 days

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
Pharmacokinetics of DA-7503 single dose oral administration
Time Frame: 5 days
Peak Plasma Concentration of DA-7503 (Cmax)
5 days
Pharmacokinetics of DA-7503 single dose oral administration
Time Frame: 5 days
Area under the plasma concentration versus time curve of DA-7503 (AUClast)
5 days
Pharmacokinetics of DA-7503 multiple dose oral administration
Time Frame: 11 days
Peak Plasma Concentration of DA-7503 (Cmax)
11 days
Pharmacokinetics of DA-7503 multiple dose oral administration
Time Frame: 11 days
Area under the plasma concentration versus time curve of tau (AUCtau)
11 days
Pharmacokinetics of DA-7503 multiple dose oral administration
Time Frame: 11 days
Peak Plasma Concentration of DA-7503 in steady state (Cmax,ss)
11 days
Pharmacokinetics of DA-7503 multiple dose oral administration
Time Frame: 11 days
Area under the plasma concentration versus time curve of tau in steady state (AUCtau,ss)
11 days

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.
Dong-A ST Co., Ltd.

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.
May 27, 2024

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.
January 12, 2026

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.
January 12, 2026

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 21, 2024

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 25, 2024

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.
April 30, 2024

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.
May 22, 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.
May 19, 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.
May 1, 2026

More Information

Terms related to this study

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.
  • DA7503_AD_Ia

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

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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