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Cyclobenzaprine

Phase 2

Acute Stress Reaction | Small molecule | Other |Tonix Pharmaceuticals Holding Corp.|Last Updated: Apr 13, 2026

Target and mechanism

Molecular targetHTR2A, HTR2C
Target classAntagonist
ModalitySmall molecule
ChEMBLCHEMBL669

Also known as Cyclobenzaprine HCl

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment180

FDA Designations

No designations recorded

Clinical trial landscape

Cyclobenzaprine · 1 trial · 4 indications

Phase 2 1
NCT06636786Prevention/Reduction of ASRs and PTSD to Sustain Civilian Performance With Sublingual Cyclobenzaprine HCl (TNX-102 SL)Acute Stress Reaction
RECRUITING180 Analytics
PHASE2RECRUITING
Prevention/Reduction of ASRs and PTSD to Sustain Civilian Performance With Sublingual Cyclobenzaprine HCl (TNX-102 SL)
Acute Stress ReactionUnlock trial analytics

Study Endpoints

Primary Endpoints

Change in ASD Score
Week 1, 3 after MVC

Individuals are asked to complete the 14-item Acute Stress Disorder Scale (ASDS) self-report inventory where each item is rated on a 5-point scale (0= Not at all; 1= Mildly; 2= Medium; 3= Quite a bit; 4= Very Much) that indexes acute stress disorder (ASD). Range of possible total scores is 0-56, with higher total scores indicating greater acute stress symptoms.

Secondary Endpoints

Median reaction time of correct responses (general cognitive function)
Min 30, Hour 1, 6, 12, Day 1, 2, 3, Week 1, 2, 3, 5, 6, 8, 11, 12 after MVC
Median reaction time of correct responses (procedural reaction time)
Min 30, Hour 1, 6, 12, Day 1, 2, 3, Week 1, 2, 3, 5, 6, 8, 11, 12 after MVC
Proportion of targets correctly identified (visuospatial processing and attention)
Min 30, Hour 1, 6, 12, Day 1, 2, 3, Week 1, 2, 3, 5, 6, 8, 11, 12 after MVC
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
Cyclobenzaprine HClEXPERIMENTALParticipants will be instructed to take a half dose (equivalent to 1 tablet, 2.8 mg) of Cyclobenzaprine HCl in the ED as part of enrollment procedures. If the time between the first half dose and the planned bedtime of the participant is less than 6 hours, participants will be instructed to take 1 tablet (half dose) the first night at bedtime. If the time between the first half dose and planned bedtime of the participant is greater than or equal to 6 hours, then participants will be instructed to take a full dose (equivalent to 2 tablets) the first night. Over the following 13 days, all participants will be instructed to take a full dose of the study drug at bedtime. Each participant will receive 29 tablets and take either 28 or 29 tablets total for the duration of study participation.
PlaceboPLACEBO_COMPARATORParticipants will be instructed to take a half dose (equivalent to 1 tablet, 2.8 mg) of placebo in the ED as part of enrollment procedures. The placebo is the same formulation as active except the Cyclobenzaprine HCl content is replaced by Mannitol to maintain the same tablet weight and dimensions. If the time between the first half dose and the planned bedtime of the participant is less than 6 hours, participants will be instructed to take 1 tablet (half dose) the first night at bedtime. If the time between the first half dose and planned bedtime of the participant is greater than or equal to 6 hours, then participants will be instructed to take a full dose (equivalent to 2 tablets) the first night. Over the following 13 days, all participants will be instructed to take a full dose of the study drug at bedtime. Each participant will receive 29 tablets and take either 28 or 29 tablets total for the duration of study participation.

Interventions

NameTypeDescription
Cyclobenzaprine HClDRUGTNX-102 SL (cyclobenzaprine HCl sublingual tablets) taken sublingually (under the tongue) in the ED and each day at bedtime for a total of 2 weeks.
PlaceboDRUGPlacebo sublingual tablets taken sublingually (under the tongue) in the ED and each day at bedtime for a total of 2 weeks.
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Eligibility Criteria

Age Range18 Years to 55 Years
SexALL
Healthy VolunteersNo
Study Sites9

Inclusion Criteria: 1. ≥ 18 years and ≤ 55 years of age 2. Presentation to ED within 72 hours of MVC 3. Anticipated to be discharged home from the ED 4. Stated willingness to comply with all study procedures and availability for the duration of the study 5. Consent to receive unencrypted communicat...

Countries:United States
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Frequently asked questions about Cyclobenzaprine

What is Cyclobenzaprine used for?

Cyclobenzaprine is being studied for the prevention and reduction of Acute Stress Reactions (ASRs) and post-traumatic stress, as well as for sustaining civilian performance. It is an investigational small molecule in Phase 2 clinical development for Acute Stress Reaction.

What does Cyclobenzaprine target?

Cyclobenzaprine is a small molecule that acts on the central nervous system. It is being evaluated for its effects on Acute Stress Reaction, Acute Stress Disorder, neurocognitive function, and post-traumatic stress in a clinical trial setting.

Who makes Cyclobenzaprine?

Cyclobenzaprine is being developed by Tonix Pharmaceuticals Holding Corp. (NASDAQ: TNXP). The company is conducting a Phase 2 clinical trial of the drug, known as TNX-102 SL, for the prevention and reduction of Acute Stress Reactions and PTSD.

What phase is Cyclobenzaprine in?

Cyclobenzaprine is in Phase 2 clinical development. It is an investigational drug and has not been approved by the FDA. The ongoing Phase 2 trial is currently recruiting participants in the United States.

What clinical trials is Cyclobenzaprine in?

Cyclobenzaprine is being studied in a Phase 2 clinical trial with the identifier NCT06636786. This randomized, double-blind, placebo-controlled trial is recruiting 180 participants aged 18 years and older in the United States to evaluate the drug for Acute Stress Reaction and related conditions.

Is Cyclobenzaprine the same as Cyclobenzaprine HCl?

Yes, Cyclobenzaprine is also known as Cyclobenzaprine HCl. In clinical trials, it is referred to as TNX-102 SL, which is the sublingual formulation being developed by Tonix Pharmaceuticals for the prevention and reduction of Acute Stress Reactions and PTSD.