Recent Updates
Recently added Catalysts

SUZ

Phase 3

Acute Pain | Small molecule | Pain |Vertex Pharmaceuticals Incorporated|Last Updated: Aug 1, 2025

Success Probability

Subscribe to view

Market & Valuation

Subscribe to view

Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment1,075

FDA Designations

No designations recorded

Clinical trial landscape

SUZ · 2 trials · 2 indications

Phase 3 1Phase 1 1
NCT05553366Evaluation of Efficacy and Safety of VX-548 for Acute Pain After a BunionectomyAcute Pain
COMPLETED1,075 Analytics
PHASE3COMPLETED
Evaluation of Efficacy and Safety of VX-548 for Acute Pain After a Bunionectomy
Acute PainUnlock trial analytics

Study Endpoints

Primary Endpoints

Time-weighted Sum of the Pain Intensity Difference (SPID) as Recorded on a Numeric Pain Rating Scale (NPRS) From 0 to 48 Hours (SPID48), SUZ Compared to Placebo
0 to 48 hours After First Dose of Study Drug

SPID was calculated as the sum of the product of time (in hours) elapsed since previous measurements and pain intensity difference. Pain intensity difference was calculated subtracting the baseline pain intensity score from the pain intensity score at each postdose time point (using pain rating score range: 0= no pain to 10= worst possible pain). SPID48 was calculated from 0 to 48 hours and the score range was -480 (worst score) to 480 (best score).

Flavor Assessment Based on Flavor Profile Method of Descriptive Sensory Analysis per American Society for Testing and Material (ASTM) Approved Sensory Evaluation Method
Periodic Intervals up to 30 minutes post oral administration

Secondary Endpoints

Time-weighted Sum of the Pain Intensity Difference (SPID) as Recorded on a Numeric Pain Rating Scale (NPRS) From 0 to 48 Hours (SPID48), SUZ Compared to HB/APAP
0 to 48 hours After First Dose of Study Drug
Time to Greater Than or Equal to (≥)2-Point Reduction in NPRS,SUZ Compared to Placebo
From Baseline Up to 48 Hours After First Dose of Study Drug
Time to ≥1-Point Reduction in NPRS, SUZ Compared to Placebo
From Baseline Up to 48 Hours After First Dose of Study Drug
Unlock Study Endpoints

Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
PlaceboPLACEBO_COMPARATORParticipants received placebo matched to suzetrigine (SUZ) and hydrocodone bitartrate/acetaminophen (HB/APAP) for 2 days.
Hydrocodone bitartrate/acetaminophen (HB/APAP)ACTIVE_COMPARATORParticipants received HB 5 milligrams (mg)/ APAP 325 mg every 6 hours (q6h) for 2 days.
Suzetrigine (SUZ)EXPERIMENTALParticipants received SUZ \[100 mg as first dose, followed by 50 mg every 12 hours (q12h)\] for 2 days.
SUZEXPERIMENTALParticipants will be given SUZ SDD to retain in their mouths for approximately 10 seconds and then expectorate.

Interventions

NameTypeDescription
SUZDRUGTablets for oral administration.
HB/APAPDRUGCapsules for oral administration.
Placebo (matched to SUZ)DRUGPlacebo matched to SUZ for oral administration.
Placebo (matched to HB/APAP)DRUGPlacebo matched to HB/APAP for oral administration.
Unlock Study Design Details

Eligibility Criteria

Age Range18 Years to 80 Years
SexALL
Healthy VolunteersNo
Study Sites21

Key Inclusion Criteria: * Before Surgery * Participants scheduled to undergo a primary unilateral bunionectomy with distal first metatarsal osteotomy (i.e., Austin procedure) and internal fixation under regional anesthesia (Mayo and popliteal sciatic block) * After Surgery * Participant is lu...

Countries:United States
Unlock Eligibility Criteria

Competitive Landscape -Acute Kidney Injury 14 trials (matched to "Acute Pain")

Frequently asked questions about SUZ

What is SUZ used for?

SUZ, also known as suzetrigine, is an investigational small molecule being developed for the treatment of acute pain and pain. It is currently in Phase 3 clinical development for acute pain, with a completed Phase 3 trial evaluating its efficacy and safety after a bunionectomy.

What does SUZ target?

SUZ is a small molecule that targets pain pathways. As a selective NaV1.8 inhibitor, it works by blocking the NaV1.8 sodium channel, which plays a key role in pain signaling. This mechanism is being studied for its potential to provide pain relief without the risks associated with opioids.

Who makes SUZ?

SUZ is being developed by Vertex Pharmaceuticals Incorporated, a biopharmaceutical company traded on the NASDAQ under the ticker symbol VRTX. Vertex is conducting clinical trials to evaluate the safety and efficacy of SUZ for pain indications.

What phase is SUZ in?

SUZ is in Phase 3 clinical development for acute pain. A Phase 3 trial (NCT05553366) has been completed, and a Phase 1 study (NCT06834009) has also been completed. SUZ is investigational and not yet approved by regulatory authorities.

What clinical trials is SUZ in?

SUZ has been studied in two completed clinical trials. The Phase 3 trial NCT05553366 evaluated the efficacy and safety of VX-548 for acute pain after a bunionectomy in 1075 participants. The Phase 1 trial NCT06834009 studied suzetrigine spray-dried dispersion in healthy adult panelists.

Is SUZ the same as VX-548?

Yes, SUZ is also known as suzetrigine and was previously referred to as VX-548 in clinical trials. The Phase 3 trial NCT05553366 used the name VX-548, while the Phase 1 trial used the name suzetrigine (SUZ). Both names refer to the same investigational drug.