A Study of TAK-360 in Adults With Narcolepsy Type 1 (Narcolepsy With Cataplexy)

June 2, 2026 updated by: Takeda

A Randomized, Double-Blind, Placebo-Controlled Trial to Evaluate the Safety, Tolerability, and Efficacy of TAK-360 for the Treatment of Narcolepsy With Cataplexy (Narcolepsy Type 1)

Narcolepsy is a sleep disorder that disrupts a person's regular sleep-wake cycle. It causes extreme sleepiness during the day (called excessive daytime sleepiness [EDS]), where a person may fall asleep without warning. Narcolepsy Type 1 (NT1) is a form of the condition in which people also have sudden, unexpected muscle weakness while staying conscious (called cataplexy).

The main aim of this study is to learn how safe TAK-360 is and how well adults with NT1 tolerate it. Adults who can participate in the study will have to stop taking their existing medicines for NT1 before study treatment starts. Participants may be randomly (by chance, like drawing names from a hat) assigned to get either TAK-360 or placebo during the treatment period. The placebo looks just like TAK-360 but does not have any medicine in it. After the treatment period, participants can be monitored for another 2 weeks. Participants can restart their usual NT1 treatment after study treatment ends.

The participants will have to visit the clinic multiple times during this study.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

92

Phase

  • 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 Contact

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
  • Older Adult

Accepts Healthy Volunteers

No

Description

Key Inclusion Criteria:

  1. The participant has a body mass index within the range 18 to 40 kilograms per meter square (kg/m^2) (inclusive).
  2. The participant has an International Classification of Sleep Disorders, Third Edition (ICSD-3) or ICSD-3 Text Revision diagnosis of NT1.

Key Exclusion Criteria:

  1. The participant has a current medical disorder, other than narcolepsy with cataplexy, associated with excessive daytime sleepiness.
  2. The participant: (a) has a history of myocardial infarction; (b) has a history of clinically significant thyroid disease, coronary artery disease, cardiac rhythm abnormality or heart failure.
  3. The participant has a clinically significant history of head injury or head trauma.
  4. The participant has a history of epilepsy, seizure, or convulsion (except for a single febrile seizure in childhood).
  5. The participant has a history of cerebral ischemia, transient ischemic attack (<5 years from screening), intracranial aneurysm, or arteriovenous malformation.
  6. The participant has a history of cancer in the past 5 years (does not apply to participants with carcinoma in situ that has been resolved without further treatment or basal cell carcinoma; these participants may be included after approval by the medical monitor).
  7. The participant has a positive test result for hepatitis B surface antigen, hepatitis B core antibody, hepatitis C virus antibody, or human immunodeficiency virus (HIV) antibody/antigen at screening.
  8. The participant plans to participate in any other interventional trial while participating in TAK-360-2004 or has previously participated in another part in TAK-360-2004.
  9. The participant has a known hypersensitivity to any component of the formulation of TAK-360 or related compounds.

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: Triple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Part A: TAK-360
Participants will receive TAK-360 tablets, orally.
Drug: TAK-360
TAK-360 tablet
Placebo Comparator: Part A: Placebo
Participants will receive TAK-360 matching placebo tablets, orally.
Drug: Placebo
TAK-360 matching placebo tablet
Experimental: Part B: TAK-360
Participants will receive TAK-360 tablets, orally.
Drug: TAK-360
TAK-360 tablet
Placebo Comparator: Part B: Placebo
Participants will receive TAK-360 matching placebo tablets, orally.
Drug: Placebo
TAK-360 matching placebo tablet
Experimental: Part C
Participants will receive TAK-360 tablets, orally.
Drug: TAK-360
TAK-360 tablet

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Parts A, B and C: Number of Participants With at Least One Treatment-emergent Adverse Events (TEAEs)
Time Frame: Up to approximately 28 weeks
An adverse event (AE) is any untoward medical occurrence in a clinical trial participant, temporally associated with the use of the trial intervention, whether or not the occurrence is considered related to the trial intervention. A TEAE is defined as any event emerging or manifesting at or after the initiation of treatment with a study intervention or medicinal product or any existing event that worsens in either intensity or frequency following exposure to the study intervention or medicinal product.
Up to approximately 28 weeks

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Parts A and B: Change from Baseline in Mean Sleep Latency From the Maintenance of Wakefulness Test (MWT) at Week 6
Time Frame: Baseline, Week 6
The MWT evaluates a person's ability to remain awake under soporific conditions for a defined period of time. Because there is no biological measure of wakefulness, wakefulness is measured indirectly by the inability or delayed tendency to fall asleep.
Baseline, Week 6
Parts A and B: Change from Baseline in Epworth Sleepiness Scale (ESS) Total Score at Week 6
Time Frame: Baseline, Week 6
The ESS provides individuals with 8 different situations of daily life and asks them how likely they are to fall asleep in those situations (scored 0 to 3) and to try to imagine their likelihood of dozing even if they have not actually been in the identical situation; the scores are summed to give an overall score of 0 to 24. Higher scores indicate stronger subjective daytime sleepiness, and scores below 10 are considered to be within the reference range.
Baseline, Week 6
Parts A and B: Weekly Cataplexy Rate (WCR) at Week 6
Time Frame: Week 6
Week 6

Collaborators and Investigators

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

Sponsor

Takeda

Investigators

  • Study Director: Study Director, Takeda

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

Helpful Links

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)

June 4, 2026

Primary Completion (Estimated)

November 28, 2027

Study Completion (Estimated)

November 28, 2027

Study Registration Dates

First Submitted

June 2, 2026

First Submitted That Met QC Criteria

June 2, 2026

First Posted (Actual)

June 8, 2026

Study Record Updates

Last Update Posted (Actual)

June 8, 2026

Last Update Submitted That Met QC Criteria

June 2, 2026

Last Verified

June 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • TAK-360-2004
  • 2025-522587-33-00 (Ctis)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

Takeda provides access to the de-identified individual participant data (IPD) for eligible studies to aid qualified researchers in addressing legitimate scientific objectives (Takeda's data sharing commitment is available on https://clinicaltrials.takeda.com/takedas-commitment?commitment=5). These IPDs will be provided in a secure research environment following approval of a data sharing request, and under the terms of a data sharing agreement.

IPD Sharing Access Criteria

IPD from eligible studies will be shared with qualified researchers according to the criteria and process described on https://vivli.org/ourmember/takeda/. For approved requests, the researchers will be provided access to anonymized data (to respect patient privacy in line with applicable laws and regulations) and with information necessary to address the research objectives under the terms of a data sharing agreement.

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • ICF
  • CSR

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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