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A Trial of the Safety and Tolerability of SEP-363856 in Adults With Generalized Anxiety Disorder

A Phase 3, Multicenter, Open-Label Extension Trial to Evaluate the Safety and Tolerability of SEP-363856 in the Treatment of Adults With Generalized Anxiety Disorder

Status
Not yet recruiting
Phases
Phase 3
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07786454
Enrollment
1120
Registered
2026-08-26
Start date
2026-10-06
Completion date
2029-06-02
Last updated
2026-08-26

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Generalized Anxiety Disorder

Keywords

Generalized Anxiety Disorder, GAD, Anxiety

Brief summary

This is a global, Phase 3, multicenter, open-label extension trial designed to evaluate the long-term safety, tolerability and efficacy of SEP-363856 administered at doses of 50 milligrams (mg) or 75 mg per day in adult participants with generalized anxiety disorder (GAD) over a treatment period of 26 weeks.

Interventions

DRUGSEP-363856

Oral tablet

Sponsors

Otsuka Pharmaceutical Development & Commercialization, Inc.
Lead SponsorINDUSTRY

Study design

Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

Key Inclusion Criteria 1. Male or female participants at least 18 years of age at the time of informed consent 2. Completed one of the prior GAD Phase 3 studies involving SEP-363856 through Week 8 without discontinuation of trial intervention 3. Able to continue treatment without interruption, and is considered by investigator to potentially benefit from SEP-363856 4. Participant is willing and able to comply with study procedures and visit schedule 5. i) Females of childbearing potential: negative pregnancy test and agreement to use acceptable contraception ii) Males: agreement to follow protocol-defined contraception and reproductive restrictions Key

Exclusion criteria

1. Diagnosis other than GAD that is the primary focus of treatment 2. Clinically significant psychiatric or medical condition that may interfere with study participation 3. Lifetime history of meeting Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) criteria for, or was diagnosed during the prior study with, a psychiatric disorder that would compromise accurate assessment of safety and efficacy outcomes 4. Clinically significant abnormal laboratory values or ECG findings 5. Significant suicide risk 6. Substance use/positive drug screen 7. Use of prohibited medications/therapies 8. Known sensitivity to SEP-363856

Design outcomes

Primary

MeasureTime frame
Number of Participants With Treatment-Emergent Adverse Events (TEAEs), Serious Adverse Events (SAEs), and TEAEs Leading to DiscontinuationThroughout the trial (up to Week 27)

Secondary

MeasureTime frameDescription
Change From Baseline in Clinical Global Impression-Severity (CGI-S) ScoreBaseline, Weeks 8, 14, and 26The CGI-S is a clinician-rated assessment of the participant's current illness state on a 7-point Likert-type scale (1=normal, not at all ill; 7=among the most extremely ill participants), where a higher score is associated with greater illness severity. A decrease in value indicates improvement.
Change From Baseline in Hamilton Anxiety Rating Scale (HAM-A) Total ScoreBaseline, Weeks 8, 14, and 26The HAM-A is a clinician-administered rating scale developed to quantify the severity of anxiety symptomatology. It consists of 14 items, each defined by a series of symptoms. Each item is scored on a 5-point Likert-type scale ranging from 0 (absent) to 4 (very severe). The total score ranges from 0 to 56, with higher scores indicating greater severity.

Contacts

CONTACTOtsuka Call Center
ProfessionalServices@otsuka-us.com844-687-8522

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Aug 27, 2026