Study of AGN-151607-DP to Assess Adverse Events and Change in Disease Activity in Adult Participants With Upper Limb Essential Tremor

June 23, 2026 updated by: AbbVie

A Phase 2b Multicenter, Randomized, Double-Blind, Placebo-Controlled Study With an Open-Label Period to Evaluate the Efficacy and Safety of AGN-151607-DP (USAN: gemibotulinumtoxinA) for the Treatment of Upper Limb Essential Tremor in Adults

Upper limb essential tremor (UL ET) is a movement disorder characterized by postural and/or kinetic tremor. It can cause difficulty with everyday tasks such as writing, pouring, and eating. This study will assess if AGN-151607-DP is safe and effective by assessing adverse events and change in disease activity in adult participants with UL ET.

AGN-151607-DP is an investigational drug being developed to treat UL ET. Participants will be randomly placed in treatment groups to receive either AGN151607-DP or matching placebo. Approximately 94 adult participants with upper limb essential tremor will be enrolled in approximately 40 sites in the United States/Canada.

Participants will receive intramuscular injections of AGN-151607-DP or matching placebo. Duration of the study is approximately 72 weeks.

The effect of the treatment will be checked by completion of questionnaires and side effects will be monitored by medical assessments.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

94

Phase

  • Phase 2

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 Locations

  • United States
    • California
      • Fresno, California, United States, 93710
        • Recruiting
        • Neuro Pain Research Center /ID# 277899
    • Florida
      • Boca Raton, Florida, United States, 33486
        • Recruiting
        • Parkinson'S Disease & Movement Disorders Center Of Boca Raton /ID# 277079
      • Orlando, Florida, United States, 32803-1839
        • Recruiting
        • Charter Research - Winter Park /ID# 277875

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

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Minimum body weight of 50 kg (110 pounds) at Screening.

  • Diagnosis of essential tremor (ET) in accordance with the modified Tremor Research Investigation Group (TRIG) criteria, as follows:

    • Bilateral postural tremor with or without kinetic tremor, involving hands and forearms
    • Tremor of other body parts may or may not be present in addition to upper limb (UL) tremor
    • Bilateral tremor may or may not be asymmetric
    • Tremor that is reported by the participant to be persistent, although the amplitude may fluctuate.

Exclusion Criteria:

  • History of any medical condition that may put the participant at increased risk with exposure to purified botulinum toxin type A complex, including diagnosed muscular dystrophy (e.g., Duchenne's muscular dystrophy), myasthenia gravis, Eaton-Lambert syndrome, amyotrophic lateral sclerosis, mitochondrial disease, or any other significant disease that might interfere with neuromuscular junctional disorders.
  • History of an allergic reaction to or significant sensitivity to AGN-151607-DP or its excipients and/or other botulinum toxins.

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: Triple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: AGN-151607-DP
Participants will receive AGN-151607-DP.
Drug: AGN-151607-DP
Intramuscular Injection
Placebo Comparator: Placebo for AGN-151607-DP
Participants will receive Placebo for AGN-151607-DP.
Drug: Placebo for AGN-151607-DP
Intramuscular Injection

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change From Baseline in The Essential Tremor Rating Assessment Scale (TETRAS)
Time Frame: 72 weeks
TETRAS assesses participants' ability to function. Items are rated on a 5-category response scale from 0 (no tremor) to 4 (severe tremor).
72 weeks
Number of Participants with Adverse Events (AEs)
Time Frame: 72 weeks
An adverse event (AE) is defined as any untoward medical occurrence in a patient or clinical investigation participant administered a pharmaceutical product which does not necessarily have a causal relationship with this treatment. The investigator assesses the relationship of each event to the use of study.
72 weeks

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change From Baseline in The Essential Tremor Rating Assessment Scale - Upper Limb (TETRAS-UL)
Time Frame: 72 weeks
TETRAS Upper Limb (UL) Scale is an item of the TETRAS performance subscale that is designed to assess upper limb tremor. Items are scored from 0 to 4, with 0 indicating no tremor and 4 indicating a severe tremor.
72 weeks
Change From Baseline in Clinical Global Impression of Severity (CGIS)
Time Frame: 72 weeks
CGI-S is a single item used to measure the clinician's impression of the current severity of the patient's essential tremor. The measure uses a 5-point rating scale with scores ranging none to very severe.
72 weeks

Collaborators and Investigators

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

Sponsor

AbbVie

Investigators

  • Study Director: ABBVIE INC., AbbVie

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)

June 18, 2026

Primary Completion (Estimated)

November 1, 2028

Study Completion (Estimated)

November 1, 2028

Study Registration Dates

First Submitted

June 23, 2026

First Submitted That Met QC Criteria

June 23, 2026

First Posted (Actual)

June 29, 2026

Study Record Updates

Last Update Posted (Actual)

June 29, 2026

Last Update Submitted That Met QC Criteria

June 23, 2026

Last Verified

June 1, 2026

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • M25-850

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

AbbVie is committed to responsible clinical trial data sharing. This includes access to anonymized, individual and trial-level data (analysis data sets), as well as other information.

IPD Sharing Time Frame

For details on when studies are available for sharing, visit https://vivli.org/ourmember/abbvie/

IPD Sharing Access Criteria

To learn more about the process, or to submit a request, visit the following link https://www.abbvieclinicaltrials.com/hcp/data-sharing/

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP

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.

No

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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