A Phase 1 Study Comparing AVP-786 With AVP-923

April 23, 2026 updated by: Otsuka Pharmaceutical Development & Commercialization, Inc.

A Phase 1, Single-center, Randomized, Double-blind, Double-dummy, 2-way Crossover Study Comparing AVP-786 With AVP-923

To compare pharmacokinetics (PK) of AVP-786 (deuterated [d6] dextromethorphan hydrobromide [d6-DM]/quinidine sulfate [Q]) to AVP-923 (dextromethorphan hydrobromide [DM]/Q) at steady state.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

62

Phase

  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Texas
      • Dallas, Texas, United States, 75247
        • Covance Dallas Clinical Research Unit

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

14 years to 56 years (Adult)

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Healthy adult males or females
  • 18 - 60 years of age
  • BMI 18 - 32 kg/m2

Exclusion Criteria:

  • History or presence of significant disease
  • History of substance abuse and/or alcohol abuse with the past 2 years
  • Use of tobacco-containing or nicotine-containing products within 6 months
  • Use of any prescription or the over-the-counter medications within 14 days

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: Other
  • Allocation: Randomized
  • Interventional Model: Crossover Assignment
  • Masking: Triple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Group 1 - Period 1
Twice daily dosing of AVP-786 orally for 8 days
Drug: AVP-786
Other Names:
  • deuterated (d6)-dextropmethorphan/quindine sulfate
Active Comparator: Group 1 - Period 2
Twice daily dosing of AVP-923 orally for 8 days
Drug: AVP-923
Other Names:
  • dextromethorphan/quinidine
Active Comparator: Group 2 - Period 1
Twice daily dosing of AVP-923 orally for 8 days
Drug: AVP-923
Other Names:
  • dextromethorphan/quinidine
Experimental: Group 2 - Period 2
Twice daily dosing of AVP-786 orally for 8 days
Drug: AVP-786
Other Names:
  • deuterated (d6)-dextropmethorphan/quindine sulfate

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
PK of d6-DM in AVP-786 compared to DM in AVP-923
Time Frame: 8 days
8 days

Secondary Outcome Measures

Outcome Measure
Time Frame
PK of metabolites
Time Frame: 8 days
8 days
Safety and tolerability
Time Frame: 8 days
8 days

Collaborators and Investigators

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

Sponsor

Otsuka Pharmaceutical Development & Commercialization, Inc.

Investigators

  • Study Director: Nadine Knowles, Avanir Pharmaceuticals

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 (Actual)

May 1, 2014

Primary Completion (Actual)

September 1, 2014

Study Completion (Actual)

March 1, 2015

Study Registration Dates

First Submitted

January 8, 2015

First Submitted That Met QC Criteria

January 8, 2015

First Posted (Estimated)

January 13, 2015

Study Record Updates

Last Update Posted (Actual)

April 28, 2026

Last Update Submitted That Met QC Criteria

April 23, 2026

Last Verified

April 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 14-AVP-786-102

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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