Idiopathic Pulmonary Fibrosis (IPF)-Related Chronic Cough Reduction With Nalbuphine (NAL) Extended-Release (ER) Tablets (OCEAN-2)

November 12, 2026 updated by: Trevi Therapeutics

A Randomized, Double-Blind, Placebo-Controlled Twelve-Week Fixed-Dose Study to Evaluate the Efficacy and Safety of Nalbuphine Extended-Release Tablets for the Treatment of Chronic Cough in Participants With Idiopathic Pulmonary Fibrosis

The primary purpose is to evaluate the safety and efficacy of NAL ER for the treatment of chronic cough in participants with IPF.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

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 (Estimated)

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.
201

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 3

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

  • United States
    • Alabama
      • Tuscaloosa, Alabama, United States, 35476
        • Recruiting
        • Sec Clinical Research - Dothan
    • Connecticut
      • New Britain, Connecticut, United States, 06051
        • Recruiting
        • Starling Physicians, P.C.
    • Delaware
      • Wilmington, Delaware, United States, 19803
        • Recruiting
        • Premier Medical Associates, LLC
    • Florida
      • Doral, Florida, United States, 33122
        • Recruiting
        • D&H Doral Research Center
      • Miami, Florida, United States, 33186
        • Recruiting
        • Coral Research Clinic Corp.
      • Miami, Florida, United States, 33173
        • Recruiting
        • Blessed Health Care and Research Inc.
      • Miami Lakes, Florida, United States, 33016
        • Recruiting
        • Pharma Medical Innovations, Inc.
      • North Miami Beach, Florida, United States, 33162
        • Recruiting
        • Essential Health and Research Services
    • Maryland
      • Rockville, Maryland, United States, 20854
        • Recruiting
        • Velocity Clinical Research - Rockville
    • Michigan
      • Allen Park, Michigan, United States, 48101
        • Recruiting
        • Vitalis Clinical Research Center LLC
    • Missouri
      • Warren, Missouri, United States, 48071
        • Recruiting
        • Veritas Clinical Research
    • North Carolina
      • Charlotte, North Carolina, United States, 28277
        • Recruiting
        • American Health Research - Charlotte Location
    • Oregon
      • Bend, Oregon, United States, 97701
        • Recruiting
        • Summit Health (Summit Medical Group) - Eastside Clinic
      • Portland, Oregon, United States, 97220
        • Recruiting
        • The Oregon Clinic - Gateway Medical Office Location - Pulmonary, Critical Care & Sleep Medicine East
    • Texas
      • Carrollton, Texas, United States, 75010
        • Recruiting
        • Stryde Research
      • Sugar Land, Texas, United States, 77478
        • Recruiting
        • Hillcroft Medical Clinic

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

40 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Diagnosis of IPF as determined by the Investigator based on American Thoracic Society (ATS)/European Respiratory Society (ERS)/Japanese Respiratory Society (JRS)/Latin American Thoracic Society (ALAT) clinical practice guidelines.
  • Chronic cough for ≥8 weeks prior to Screening.
  • PGI-Severity Score ≥ 2 at Screening.
  • Forced vital capacity (FVC) ≥40 percent (%) of predicted at Screening.
  • Diffusing capacity for carbon monoxide (DLCO) ≥25% of predicted during Screening or within 12 weeks prior to Screening.
  • If currently taking antifibrotic medication (nintedanib, pirfenidone, nerandomilast) should be on a stable dose for at least 6 weeks prior to the Baseline Visit.

Exclusion Criteria:

  • Clinical diagnosis or clinical suspicion of an upper or lower respiratory tract infection in the last 8 weeks prior to the Screening visit or during Screening.
  • Hospitalization for any respiratory illness (including acute exacerbation of IPF) within 8 weeks prior to Screening.

Note: Other protocol-defined inclusion/exclusion criteria may apply.

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: NAL ER 54 mg

Participants will undergo a 2-week blinded titration period followed by a fixed dose treatment period receiving NAL ER 54 milligrams (mg) twice daily (BID) for 12 weeks.
Drug: NAL ER

Oral tablets

Other Names:
  • Nalbuphine
Placebo Comparator: Placebo

Participants will undergo a 2-week blinded titration period followed by a fixed dose treatment period receiving a matching placebo BID for 12 weeks.
Drug: Placebo

Oral tablets

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
Time Frame
Relative Change from Baseline in 24-hour Cough Frequency at Week 14 for NAL ER Compared With Placebo
Time Frame: Baseline, Week 14
Baseline, Week 14

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Time Frame
Absolute Change from Baseline in the Cough Severity Numerical Rating Scale (CS-NRS) at Week 14 for NAL ER Compared With Placebo
Time Frame: Baseline, Week 14
Baseline, Week 14
Relative Change from Baseline in 24-hour Cough Frequency for NAL ER Compared With Placebo
Time Frame: Baseline, Weeks 6 and 10
Baseline, Weeks 6 and 10
Absolute Change from Baseline in 24-hour Cough Frequency for NAL ER Compared With Placebo
Time Frame: Baseline, Weeks 6 and 10
Baseline, Weeks 6 and 10
Proportion of Participants Achieving ≥30%, ≥50% and ≥75% Reduction from Baseline in 24-hour Cough Frequency at Week 14 for NAL ER Compared With Placebo
Time Frame: Baseline, Week 14
Baseline, Week 14
Absolute Change from Baseline in the Evaluating Respiratory Symptoms in Idiopathic Pulmonary Fibrosis (E:RS-IPF) Cough Domain at Week 14 for NAL ER Compared With Placebo
Time Frame: Baseline, Week 14
Baseline, Week 14
Absolute Change from Baseline in the E-RS:IPF Total Score and Domain Scores (IPF-Breathlessness, IPF-Cough, IPF-Sputum, and IPF-Chest Symptoms) at Week 14 for NAL ER Compared With Placebo
Time Frame: Baseline, Week 14
Baseline, Week 14
Absolute Change from Baseline in the CS-NRS for NAL ER Compared With Placebo
Time Frame: Baseline up to Week 14
Baseline up to Week 14
Proportion of Participants Achieving a ≥3-point Improvement from Baseline in CS-NRS for NAL ER Compared With Placebo
Time Frame: Baseline up to Week 14
Baseline up to Week 14
Absolute Change from Baseline in the Leicester Cough Questionnaire (LCQ) Total Scores at Week 14 for NAL ER Compared With Placebo
Time Frame: Baseline, Week 14
Baseline, Week 14
Absolute Change from Baseline in Each LCQ Domain Score (Physical, Psychological, Social) at Week 14 for NAL ER Compared With Placebo
Time Frame: Baseline, Week 14
Baseline, Week 14
Proportion of Participants Achieving a 1.3-point Increase (Improvement) from Baseline in LCQ Total Score at Week 14 for NAL ER Compared With Placebo
Time Frame: Baseline, Week 14
Baseline, Week 14
Change from Baseline in the European Quality of Life 5 Dimensions 5 Level (EQ-5D-5L) at Week 14 for NAL ER Compared With Placebo
Time Frame: Baseline, Week 14
Baseline, Week 14
Relative Change from Baseline in Awake Cough Frequency at Week 14 for NAL ER Compared With Placebo
Time Frame: Baseline, Week 14
Baseline, Week 14
Relative Change from Baseline in Sleep Cough Frequency at Week 14 for NAL ER Compared With Placebo
Time Frame: Baseline, Week 14
Baseline, Week 14
Absolute Change from Baseline in the Patient Global Impression of Severity (PGI-S) Cough Score at Week 14 for NAL ER Compared With Placebo
Time Frame: Baseline, Week 14
Baseline, Week 14
Absolute Change from Baseline in the Patient Global Impression of Change (PGI-C) Cough Score at Week 14 for NAL ER Compared With Placebo
Time Frame: Baseline, Week 14
Baseline, Week 14
Proportion of Participants with Improvements by ≥1 and ≥2 Categories from Baseline on the PGI-S Cough at Week 14 for NAL ER Compared With Placebo
Time Frame: Baseline, Week 14
Baseline, Week 14
Relative Change from Baseline in Patient-Reported Outcomes Measurement Information System (PROMIS) at Week 14 for NAL ER Compared With Placebo
Time Frame: Baseline, Week 14
Baseline, Week 14
Safety and Tolerability as Assessed by Number of Participants with Treatment Emergent Adverse Events (TEAEs)
Time Frame: Baseline up to Week 17
Baseline up to Week 17

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.
Trevi Therapeutics

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Chief Development Officer, Trevi Therapeutics, Inc.

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.
September 30, 2026

Primary Completion (Estimated)

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.
August 1, 2027

Study Completion (Estimated)

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.
October 1, 2027

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).
October 5, 2026

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.
October 5, 2026

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.
October 9, 2026

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.
November 13, 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.
November 12, 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.
November 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

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.
  • NAL03-302

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

Yes

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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