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TinnitusPhase 2NCT05645432

An Open-Label Study Evaluating Brexanolone in Adults With Tinnitus

A Phase 2 study testing Brexanolone in people with Tinnitus, run by Supernus Pharmaceuticals, Inc. at 2 sites in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

The primary objective of this study is to evaluate the safety and tolerability of brexanolone in participants with tinnitus following a single 6-hour continuous intravenous (IV) infusion. Read more about this study

Who is it for?
Ages 18 to 65 years
Conditions the study is for
Tinnitus
What is being tested?
Brexanolone
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
10 participants
Where
2 sitesUnited States
Study dates
10 May 2023to 21 Nov 2023
Phase
Phase 2
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 65 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Participant has a designated companion for the Clinic Treatment Visit who will drive them when they leave the clinic
  • Participant is in good physical health and has no clinically significant findings (excluding tinnitus), as determined by the investigator on medical history and physical examination, including neurologic and mental status examinations, 12-lead electrocardiogram (ECG), or clinical laboratory tests
  • Participant has a diagnosis of subjective, idiopathic, unilateral or bilateral, non-pulsatile tinnitus (e.g., not due to medical disease) of ≥6 months and <10 years duration
  • Participant has mild to severe tinnitus distress according to Tinnitus Handicap Inventory (THI) score of 24 to 68 at Screening
  • Participant is willing and able to safely discontinue the use of central nervous system (CNS) depressants (e.g., opioids and benzodiazepines), antidepressants, anticonvulsants, CNS stimulants (with the exception of caffeine), aspirin, other nonsteroidal anti inflammatory drugs, and aminoglycosides at least 14 days or 5 half-lives (whichever is longer) prior to receiving IP and through completion of the study

Who cannot join

  • Participant has history or presence of any neurologic disease or condition, including, but not limited to, unexplained loss of consciousness, seizure disorder including a prior nonfebrile seizure, and closed head trauma with clinically significant sequelae
  • Participant has a history of sleep apnea or any clinically significant respiratory conditions that may predispose the participant to hypoxia during the infusion
  • Participant intends to start or discontinue a pharmacological or nonpharmacological therapy (e.g., psychotherapy, sound therapy, masking, transcranial magnetic stimulation [TMS]) for tinnitus during the course of the study
  • Participant has currently active and medically significant or uncontrolled hepatic, renal, cardiovascular, pulmonary, gastrointestinal, hematological, immunologic, metabolic disease (hypothyroidism with stable thyroid replacement is acceptable)
  • Participant's tinnitus can be modulated by maneuvers of the temporomandibular joint, head and neck, eyes, or limbs, or otherwise attributed to somatosensory cause or has had prior otoscopic surgeries or cholesteatoma
  • Participants has current unilateral or bilateral hearing loss of 30 decibel (dB) or greater (mild hearing loss) in one or more tested frequencies (500 Hertz [Hz], 1000 Hz, 2000 Hz, and 4000 Hz), 60 dB or greater at 6000 Hz and 8000 Hz, asymmetry of 30 dB or greater in two or more tested frequencies, or uses a cochlear implant or hearing aid
Show all 16Show fewer
  • Participant has history of chronic otitis media (>3 per year during past 5 years)
  • Participant has a total score of 15 or greater (i.e., moderately severe) on the Patient Health Questionnaire-9 (PHQ-9) at Screening
  • Participant has diagnosis of moderate or severe substance use disorder (excluding nicotine dependence) within 12 months of Screening, has a positive screen for drugs of abuse including tetrahydrocannabinol (THC) on Day 1 prior to dosing, or has a positive screen for alcohol on Day 1 prior to dosing
  • Participant has a known allergy to progesterone, allopregnanolone, or any IP excipient
  • Participant has had exposure to another investigational drug or device within 30 days or 5 half-lives of the investigational drug, whichever is longer, prior to the Day 1 visit
  • Participant has a history of suicidal behavior within 2 years or answers "YES" to Questions 3, 4, or 5 on the Columbia-Suicide Severity Rating Scale (C-SSRS) at Screening or at Day 1 or is currently at risk of suicide in the opinion of the investigator
  • Participant has donated 1 or more units (1 unit = 450 milliliter [mL]) of blood or experienced acute loss of an equivalent amount of blood within 60 days prior to Day 1
  • Participant has any condition, comorbidity, or lifestyle consideration that in the opinion of the investigator would limit or interfere with the participant's ability to complete or partake in the study
  • Participant is unwilling or unable to comply with study procedures and the required training during the Baseline Period. The participant must complete 10 VAS assessments remotely prior to Day 1
  • Participant is unable to complete participation in the study, e.g., due to preplanned event including elective surgery

Trial locations and contacts

2 sites in 1 country.

United States2 sites
  • Sage Investigational Site

    Atlanta, Georgia, 30331

  • Sage Investigational Site

    Iowa City, Iowa, 52242

Other trials in United States

About this study

Official title: An Open-Label Study Evaluating the Safety, Tolerability, Pharmacokinetics, and Efficacy of Brexanolone in the Treatment of Adult Participants With Tinnitus

The primary objective of this study is to evaluate the safety and tolerability of brexanolone in participants with tinnitus following a single 6-hour continuous intravenous (IV) infusion.

Conditions
Tinnitus
Being tested
Brexanolone
Keywords
Tinnitus
Medical subject headings
Tinnitus

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • BrexanoloneDrug

    Also called Allopregnanolone, ZULRESSO®, SAGE-547

    Brexanolone IV infusion

Study groups in NCT05645432
Study groupRoleWhat they receive
BrexanoloneExperimentalParticipants will receive a 6-hour single continuous intravenous (IV) infusion of brexanolone at 30 micrograms per kilogram per hour (mcg/kg/hour) for 0 to 0.5 hours, at 60 mcg/kg/hour for 0.5 to 1 hour, and at 90 mcg/kg/hour for 1 to 6 hours, on Day 1 of the Treatment Period.
Receives: Drug: Brexanolone

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Number of Participants With Treatment-Emergent Adverse Events (TEAE)

    An adverse event (AE) is any untoward medical occurrence in a participant or clinical investigation participant administered 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 (including an abnormal laboratory finding), symptom or disease temporally associated with the use of a medicinal (investigational) product whether or not related to the medicinal (investigational) product. A TEAE is defined as an AE with onset after the start of brexanolone, or any worsening of a pre-existing medical condition/adverse event with onset after the start of brexanolone and throughout the study.

    Measured: Up to Day 15

Secondary outcomes (8)
  1. Change From Baseline (Observed Value) to Hour 6 of Infusion in Visual Analog Scale-Loudness (VAS-L) Ratings

    VAS-L is a subject-rated scale used to assess the perceived loudness of tinnitus. Participants answered the question "How loud is your tinnitus now?" on a horizontal scale anchored on left by "not audible" (score of 0) and on right by "extremely loud" (score of 100). Higher scores represent greater severity. Negative change from baseline represents better outcome of the treatment.

    For the treatment period (Day 1), baseline was defined as the most recent value immediately prior to the start of brexanolone infusion, or predose.

    Measured: Baseline; 0.5, 1, 2, 3, 4, 5, and 6 hours during brexanolone infusion on Day 1

  2. Change From Baseline (Model Based) to Hour 6 of Infusion in VAS-L Ratings

    VAS-L is a subject-rated scale used to assess the perceived loudness of tinnitus. Participants answered the question "How loud is your tinnitus now?" on a horizontal scale anchored on left by "not audible" (score of 0) and on right by "extremely loud" (score of 100). Higher scores represent greater severity. Negative change from baseline represents better outcome of the treatment.

    A Mixed Model Repeated Measures (MMRM) with fixed effects for baseline VAS component value and change from baseline scores as the dependent variable is used.

    For the treatment period (Day 1), baseline was defined as the most recent value immediately prior to the start of brexanolone infusion, or predose.

    Measured: Baseline; 0.5, 1, 2, 3, 4, 5, and 6 hours during brexanolone infusion on Day 1

  3. Change From Baseline (Observed Value) to Hour 6 of Infusion in Visual Analog Scale-Annoyance (VAS-A) Ratings

    VAS-A is a subject-rated scale used to assess the tinnitus. Participants answered the question "How much is your tinnitus annoying you now?" on a horizontal scale anchored on the left by "not annoying" (score of 0) and on the right by "extremely annoying" (score of 100). Higher scores represent greater severity. Negative change from baseline represents better outcome of the treatment.

    For the treatment period (Day 1), baseline was defined as the most recent value immediately prior to the start of brexanolone infusion, or predose.

    Measured: Baseline; 0.5, 1, 2, 3, 4, 5, and 6 hours during brexanolone infusion on Day 1

  4. Change From Baseline (Model Based) to Hour 6 of Infusion in VAS-A Ratings

    VAS-A is a subject-rated scale used to assess the tinnitus. Participants answered the question "How much is your tinnitus annoying you now?" on a horizontal scale anchored on the left by "not annoying" (score of 0) and on the right by "extremely annoying" (score of 100). Higher scores represent greater severity. Negative change from baseline represents better outcome of the treatment.

    A MMRM with fixed effects for baseline VAS component value and change from baseline scores as the dependent variable is used.

    For the treatment period (Day 1), baseline was defined as the most recent value immediately prior to the start of brexanolone infusion, or predose.

    Measured: Baseline; 0.5, 1, 2, 3, 4, 5, and 6 hours during brexanolone infusion on Day 1

  5. Change From Baseline (Observed Value) to Post-infusion in VAS-L Ratings Measured Via Daily Diary Over Multiple Days

    VAS-L is subject-rated scale used to assess perceived loudness of tinnitus. Participants answered question "How loud is your tinnitus now?" on horizontal scale anchored on left by "not audible" (score of 0) and on right by "extremely loud" (score of 100) via daily diary over multiple days. Higher scores= greater severity. Negative change from baseline= better outcome of treatment. For remote assessments (Day 2 through 7), ratings were obtained twice daily (morning and evening). Daily arithmetic mean was calculated by averaging morning and evening scores. If a participant was missing either a morning or evening score, then single available score was used as the mean for that day.

    Baseline is defined as the average value of Day -7 to Day -1 measurements. This was calculated by summing daily arithmetic means and dividing by total number of non-missing days.

    Measured: Baseline; Days 2, 3, 4, 5, 6, and 7 after brexanolone infusion given on Day 1

  6. Change From Baseline (Model Based) to Post-infusion in VAS-L Ratings Measured Via Daily Diary Over Multiple Days

    VAS-L is subject-rated scale used to assess perceived loudness of tinnitus. Participants answered question "How loud is your tinnitus now?" on horizontal scale anchored on left by "not audible" (score of 0) and on right by "extremely loud" (score of 100) via daily diary over multiple days. Higher scores= greater severity. Negative change from baseline= better outcome of treatment. For remote assessments (Day 2 through 7), ratings were obtained twice daily (morning and evening). Daily arithmetic mean was calculated by averaging morning and evening scores. If a participant was missing either a morning or evening score, then single available score was used as the mean for that day. A MMRM with fixed effects for baseline VAS component value and change from baseline scores as the dependent variable is used.

    Baseline is defined as the average value of Day -7 to Day -1 measurements. This was calculated by summing daily arithmetic means and dividing by total number of non-missing days.

    Measured: Baseline; Days 2, 3, 4, 5, 6, and 7 after brexanolone infusion given on Day 1

  7. Change From Baseline (Observed Value) to Post-infusion in VAS-A Ratings Measured Via Daily Diary Over Multiple Days

    VAS-A is subject-rated scale used to assess the tinnitus. Participants answered the question "How much is your tinnitus annoying you now?" on horizontal scale anchored on left by "not annoying" (score of 0) and on right by "extremely annoying" (score of 100) via daily diary over multiple days. Higher scores=greater severity. Negative change from baseline=better outcome of treatment. For remote assessments (Day 2 through 7), ratings were obtained twice daily (morning and evening). Daily arithmetic mean was calculated by averaging morning and evening scores. If a participant was missing either a morning or evening score, then single available score was used as the mean for that day.

    Baseline is defined as the average value of Day -7 to Day -1 measurements. This was calculated by summing daily arithmetic means and dividing by total number of non-missing days.

    Measured: Baseline; Days 2, 3, 4, 5, 6, and 7 after brexanolone infusion given on Day 1

  8. Change From Baseline (Model Based) to Post-infusion in VAS-A Ratings Measured Via Daily Diary Over Multiple Days

    VAS-A is subject-rated scale used to assess the tinnitus. Participants answered the question "How much is your tinnitus annoying you now?" on horizontal scale anchored on left by "not annoying" (score of 0) and on right by "extremely annoying" (score of 100) via daily diary over multiple days. Higher scores=greater severity. Negative change from baseline=better outcome of treatment. For remote assessments (Day 2 through 7), ratings were obtained twice daily (morning and evening). Daily arithmetic mean was calculated by averaging morning and evening scores. If a participant was missing either a morning or evening score, then single available score was used as the mean for that day. A MMRM with fixed effects for baseline VAS component value and change from baseline scores as the dependent variable is used.

    Baseline is defined as the average value of Day -7 to Day -1 measurements. This was calculated by summing daily arithmetic means and dividing by total number of non-missing days.

    Measured: Baseline; Days 2, 3, 4, 5, 6, and 7 after brexanolone infusion given on Day 1

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted9 Dec 2022
  2. Study start10 May 2023
  3. Primary completion21 Nov 2023
  4. Study completion21 Nov 2023

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
10 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05645432
Sponsor's protocol ID
547-TRM-201
Status last verified
Nov 2024
First submitted
1 Dec 2022
Last updated
15 Sep 2025
Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No: Data sharing will be consistent with the results submission policy of ClinicalTrials.gov.

Publications

  • Watson LS, O'Donnell P, Bankole K, Toubouti Y, Tyler RS, Johannesen JK. An open-label, proof-of-mechanism trial evaluating a neuroactive steroid GABA modulator in tinnitus. Front Neurol. 2025 Nov 18;16:1662226. doi: 10.3389/fneur.2025.1662226. eCollection 2025.

    PubMed 41341514

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing Brexanolone in people with Tinnitus, run by Supernus Pharmaceuticals, Inc. at 2 sites in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 5 inclusion and 16 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 15 Sep 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 2 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 12 Dec 2024). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Number of Participants With Treatment-Emergent Adverse Events (TEAE) (time frame: Up to Day 15). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT05645432, which also lists 1 linked publication.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 15 Sep 2025.

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