A Study of TAK-994 in Adults With Narcolepsy
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The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. |
ClinicalTrials.gov Identifier: NCT04820842 |
Recruitment Status :
Terminated
(A safety signal has emerged in Phase 2 studies of TAK-994. As an immediate precautionary measure, Takeda has suspended dosing of patients and has decided to stop Phase 2 studies early.)
First Posted : March 29, 2021
Last Update Posted : October 10, 2022
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Adults with narcolepsy who have completed the TAK-994-1501 study will be able to take part in this study.
The main aim of this study is to check if participants have side effects from TAK-994.
Participants will take one of 3 different TAK-994 dose for 8 weeks.
Then, half the participants will continue with their dose of TAK-994 and half will take a placebo. In this study, a placebo will look like a TAK-994 tablet but will not have any medicine in it. Participants will take TAK-994 or placebo for 4 weeks.
Participants will visit the clinic for a final check-up 2 weeks after their last dose of TAK-994 or placebo.
The study doctors will check for side effects from TAK-994 and placebo throughout the study.
Participants will continue to record any narcolepsy symptoms as they did in Part B of the TAK 994-1501 study.
Condition or disease | Intervention/treatment | Phase |
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Narcolepsy Type 1 (NT 1) | Drug: TAK-994 Drug: Placebo | Phase 2 |
The drug being tested in the study is called TAK-994. TAK-994, is being tested to treat participants with NT1. Participants who completed Part B of TAK-994-1501(NCT04096560) will be eligible for enrollment in this study.
This study will enroll approximately 112 patients to receive one of three different TAK 994 dose for 8 weeks (active drug extension period). Participants will be randomly assigned to one of these different TAK 994 doses which will remain undisclosed to the participant and study doctor during the study (unless there is an urgent medical need).
Following the 8-week Active Drug Extension Period, participants will continue into a 4-week Double-blind Randomized Withdrawal Period and will receive TAK-994 or Placebo.
Participants randomized to TAK-994 will continue to receive the same dose as before.
This multi-center trial will be conducted worldwide. The duration of treatment in this study is 12 weeks plus a 2 week safety follow up period. Participants will visit the clinic 10 times after the first dosing.
Study Type : | Interventional (Clinical Trial) |
Actual Enrollment : | 26 participants |
Allocation: | Randomized |
Intervention Model: | Parallel Assignment |
Masking: | Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor) |
Primary Purpose: | Treatment |
Official Title: | A Dose-Blind Extension Study With Double-blind, Placebo-Controlled, Randomized Withdrawal Period to Evaluate the Safety and Explore the Pharmacokinetics and Pharmacodynamics of TAK-994 in Adults With Narcolepsy With Cataplexy (Narcolepsy Type 1) |
Actual Study Start Date : | April 30, 2021 |
Actual Primary Completion Date : | November 3, 2021 |
Actual Study Completion Date : | November 3, 2021 |

Arm | Intervention/treatment |
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Experimental: Active Drug Extension Period: TAK-994 Dose 1
TAK-994 dose 1, tablets, orally, from Day 1 (Day 57 of previous study) to Day 56.
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Drug: TAK-994
TAK-994 tablets. |
Experimental: Active Drug Extension Period: TAK-994 Dose 2
TAK-994 dose 2, tablets, orally, from Day 1 (Day 57 of previous study) to Day 56.
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Drug: TAK-994
TAK-994 tablets. |
Experimental: Active Drug Extension Period: TAK-994 Dose 3
TAK-994 dose 3, tablets, orally, from Day 1 (Day 57 of previous study) to Day 56.
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Drug: TAK-994
TAK-994 tablets. |
Experimental: Double-blind Randomized Withdrawal Period: TAK-994 Dose 1
Following the Active Drug Extension Period, participants randomized to active treatment Dose 1 will continue to receive same dose (TAK-994, dose 1, tablets, orally) from Day 57 to Day 84.
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Drug: TAK-994
TAK-994 tablets. |
Experimental: Double-blind Randomized Withdrawal Period: TAK-994 Dose 2
Following the Active Drug Extension Period, participants randomized to active treatment Dose 2 will continue to receive same dose (TAK-994, dose 2, tablets, orally) from Day 57 to Day 84.
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Drug: TAK-994
TAK-994 tablets. |
Experimental: Double-blind Randomized Withdrawal Period: TAK-994 Dose 3
Following the Active Drug Extension Period, participants randomized to active treatment Dose 3 will continue to receive same dose (TAK-994, dose 3, tablets, orally) from Day 57 to Day 84.
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Drug: TAK-994
TAK-994 tablets. |
Placebo Comparator: Double-blind Randomized Withdrawal Period: Placebo
Following the Active Drug Extension Period participants will receive placebo-matching tablets for 4 weeks (from Day 57 to Day 84).
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Drug: Placebo
Placebo-matching tablets. |
- Number of Participants with at Least One Treatment Emergent Adverse Event (TEAE) During the Active Drug Extension Period [ Time Frame: Up to Week 8 ]An adverse event (AE) is defined as any untoward medical occurrence in a clinical investigation participants administered a drug; it does not necessarily have to have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (example, a clinically significant abnormal laboratory finding), symptom, or disease temporally associated with the use of a drug whether or not it is considered related to the drug. A TEAE is defined as an AE with an onset that occurs after receiving study drug.
- Number of Participants with at Least One Post-dose Markedly Abnormal Value (MAV) in Laboratory Test During the Active Drug Extension Period [ Time Frame: Baseline up to Week 8 ]Markedly abnormal values for laboratory tests (hematology, serum chemistries, and urinalysis) will be collected as per pre-specified criteria.
- Number of Participants with at Least One Post-dose MAV for Vital Signs During the Active Drug Extension Period [ Time Frame: Baseline up to Week 8 ]Markedly abnormal values for vital signs (body temperature, heart rate, respiratory rate, sitting blood pressure and pulse) will be collected as per pre-specified criteria.
- Number of Participants with at Least One Post-dose MAV for Electrocardiogram (ECG) Parameters During the Active Drug Extension Period [ Time Frame: Baseline up to Week 8 ]A 12 lead ECG will be performed and markedly abnormal values. will be collected as per pre-specified criteria.
- Number of Participants with at Least One TEAE During the Randomized Withdrawal Period of the Study [ Time Frame: Weeks 8 to 14 ]An AE is defined as any untoward medical occurrence in a clinical investigation participants administered a drug; it does not necessarily have to 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 a drug whether or not it is considered related to the drug. A TEAE is defined as an AE with an onset that occurs after receiving study drug.
- Number of Participants with at Least One Post-dose MAV for Laboratory Test During the Randomized Withdrawal Period [ Time Frame: Weeks 8 to 14 ]Markedly abnormal values for laboratory tests for (hematology, serum chemistries, and urinalysis) will be collected as per pre-specified criteria.
- Number of Participants with at Least One Post-dose MAV for Vital Signs During the Randomized Withdrawal Period [ Time Frame: Weeks 8 to 14 ]Markedly abnormal values (body temperature, heart rate, respiratory rate, sitting blood pressure and pulse) will be collected as per pre-specified criteria.
- Number of Participants with at Least One Post-dose MAV for ECG Parameters During the Randomized Withdrawal Period [ Time Frame: Weeks 8 to 12 ]A 12 lead ECG will be performed and markedly abnormal values will be collected as per pre-specified criteria.

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.
Ages Eligible for Study: | 18 Years to 65 Years (Adult, Older Adult) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | No |
Inclusion Criteria:
1. Participant with a diagnosis of Narcolepsy Type 1 (NT1) who has completed TAK-994-1501 Part B before enrollment (which will occur immediately following the final TAK-994-1501 assessments), and for whom the investigator has no clinical objection they be enrolled.
Exclusion Criteria:
1. Participant has a clinically significant moderate or severe ongoing AE related to the study drug from the prior study.

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04820842

Study Director: | Study Director | Takeda |
Responsible Party: | Takeda |
ClinicalTrials.gov Identifier: | NCT04820842 |
Other Study ID Numbers: |
TAK-994-1504 2021-000251-39 ( EudraCT Number ) |
First Posted: | March 29, 2021 Key Record Dates |
Last Update Posted: | October 10, 2022 |
Last Verified: | October 2022 |
Individual Participant Data (IPD) Sharing Statement: | |
Plan to Share IPD: | Yes |
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. |
Supporting Materials: |
Study Protocol Statistical Analysis Plan (SAP) Informed Consent Form (ICF) Clinical Study Report (CSR) |
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. |
URL: | https://vivli.org/ourmember/takeda/ |
Studies a U.S. FDA-regulated Drug Product: | Yes |
Studies a U.S. FDA-regulated Device Product: | No |
Drug Therapy |
Narcolepsy Disorders of Excessive Somnolence Sleep Disorders, Intrinsic Dyssomnias |
Sleep Wake Disorders Nervous System Diseases Mental Disorders |