← Back to Search

Neuromodulator

BOTOX for Enlarged Jaw Muscles

Phase 3
Recruiting
Research Sponsored by AbbVie
Eligibility Criteria Checklist
Specific guidelines that determine who can or cannot participate in a clinical trial
Must have
Participant must have bilateral Grade 4 or Grade 5 Masseter Muscle Prominence (MMP) as determined by the investigator using the Masseter Muscle Prominence Scale (MMPS)
Participant must have bilateral Grade 4 or Grade 5 MMP as determined by the participant using the Masseter Muscle Prominence Scale - Participant (MMPS-P)
Must not have
History of or current temporomandibular disorder (TMJD), or presence of signs/symptoms of possible TMJD
Timeline
Screening 3 weeks
Treatment Varies
Follow Up baseline to day 360
Awards & highlights

Summary

This trial is testing the use of BOTOX injections to reduce the size of the masseter muscle in the lower face, which can sometimes look too wide. Participants will be divided into two groups,

Who is the study for?
Adults with Masseter Muscle Prominence, which causes a widened lower face, can join this study. They'll be randomly assigned to receive either BOTOX or a placebo injection. Participants must be willing to attend monthly visits and may have the option for additional BOTOX treatment.Check my eligibility
What is being tested?
The trial is testing if BOTOX injections are safe and effective in reducing the size of masseter muscles compared to a placebo. It involves two periods: initial random assignment to BOTOX or placebo, followed by an optional phase where eligible participants can get more BOTOX treatments.See study design
What are the potential side effects?
Possible side effects from BOTOX could include pain at the injection site, muscle weakness, bruising, headache, neck pain, eye problems like dryness or tearing up, and allergic reactions.

Eligibility Criteria

Inclusion Criteria

You may be eligible if you check “Yes” for the criteria below
Select...
My jaw muscles are very prominent, rated as the highest on a specific scale.
Select...
I have severe jaw muscle prominence as I rated myself on the MMPS-P.

Exclusion Criteria

You may be eligible for the trial if you check “No” for criteria below:
Select...
I have or might have jaw joint (TMJ) problems.

Timeline

Screening ~ 3 weeks
Treatment ~ Varies
Follow Up ~baseline to day 360
This trial's timeline: 3 weeks for screening, Varies for treatment, and baseline to day 360 for reporting.

Treatment Details

Study Objectives

Outcome measures can provide a clearer picture of what you can expect from a treatment.
Primary outcome measures
Composite Achievement of MMP Severity Improvement and at Least a 2-Grade Improvement from Baseline by Both Investigator-Rated MMPS and Participant-Rated MMPS-P
Number of Participants with Adverse Events (AEs)
Secondary outcome measures
Change from Baseline in Lower Facial Shape Questionnaire-Impact Assessment (LFSQ-IA) Summary Score
Percentage of Participants Achieving Investigator-Rated MMPS Improvement Over Time
Percentage of Participants Achieving Participant-Rated MMPS-P Improvement Over Time
+3 more

Trial Design

3Treatment groups
Experimental Treatment
Placebo Group
Group I: Open-Label Period: BOTOXExperimental Treatment1 Intervention
Participants who are eligible for re-treatment will receive BOTOX injections on either the Day 180, 210, 240, or 270 visit and will be followed for up to 6 months.
Group II: Double-Blind Period: BOTOXExperimental Treatment1 Intervention
Participants will receive BOTOX injections across both the right and left masseter muscle on Day 1.
Group III: Double-Blind Period: PlaceboPlacebo Group1 Intervention
Participants will receive placebo injections across both the right and left masseter muscle on Day 1.
Treatment
First Studied
Drug Approval Stage
How many patients have taken this drug
BOTOX
2013
Completed Phase 4
~1270

Find a Location

Who is running the clinical trial?

AbbVieLead Sponsor
983 Previous Clinical Trials
509,161 Total Patients Enrolled
ABBVIE INC.Study DirectorAbbVie
414 Previous Clinical Trials
151,692 Total Patients Enrolled
~133 spots leftby Dec 2025