Suzetrigine for Opioid-Sparing Postoperative Analgesia Following Transvaginal Pelvic Reconstructive Surgery

May 29, 2026 updated by: Anne Lenore Ackerman, University of California, Los Angeles
Suzetrigine is a selective NaV1.8 inhibitor that provides peripheral analgesia without opioid-related CNS effects. This single-center stepped-wedge randomized clinical trial evaluates whether a suzetrigine-based postoperative analgesic regimen provides non-inferior pain control compared with standard opioid-inclusive care following transvaginal pelvic reconstructive surgery. The study will enroll 120 participants and assess pain, opioid consumption, adverse events, and functional recovery.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Not yet recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Suzetrigine has demonstrated analgesic efficacy comparable to hydrocodone/acetaminophen in Phase III trials and is FDA-approved for acute pain. This trial represents the first evaluation of a NaV1.8 inhibitor in pelvic reconstructive surgery. Participants will receive either suzetrigine or standard opioid-inclusive postoperative care according to a stepped-wedge randomization schedule. Pain scores, medication use, and adverse events will be collected at 48 hours, 1 week, and 6 weeks postoperatively.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
120

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 4

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 Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Contact Backup

Study Locations

  • United States
    • California
      • Los Angeles, California, United States, 90095
        • University of California, Los Angeles (UCLA)

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Age ≥ 18 years.
  • Undergoing elective transvaginal pelvic reconstructive surgery at UCLA with planned same-day discharge or 23-hour observation.
  • Able to provide written informed consent.

Exclusion Criteria:

  • Chronic opioid use.
  • Liver failure.
  • End-stage renal disease (ESRD).
  • Chronic pain syndromes, including:

Fibromyalgia Interstitial cystitis Chronic pelvic pain

  • Contraindication to acetaminophen or ibuprofen.
  • Use of strong CYP3A4 inhibitors within 7 days prior to surgery or anticipated need during the treatment period.

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: Sequential Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Suzetrigine-Based Regimen
Participants receive suzetrigine as part of a multimodal postoperative analgesic regimen. Suzetrigine is administered as a loading dose on the morning of surgery followed by twice-daily dosing for 7 days, in combination with scheduled acetaminophen and ibuprofen.
Drug: Suzetrigine

Loading dose: 100 mg orally on the morning of surgery

Maintenance dose: 50 mg orally every 12 hours for 7 days

Co-administered medications: Scheduled acetaminophen and ibuprofen

Mechanism: Selective NaV1.8 sodium channel inhibitor acting on peripheral nociceptive neurons

Purpose: Opioid-sparing postoperative analgesia

Drug: Scheduled Acetaminophen and Ibuprofen
Participants in both study arms will receive scheduled acetaminophen and ibuprofen as part of standard multimodal postoperative analgesia. These medications are administered routinely following transvaginal pelvic reconstructive surgery to reduce baseline pain, minimize opioid requirements, and support enhanced recovery.
Active Comparator: Standard Opioid-Inclusive Analgesic Regimen
Participants receive standard postoperative pain management consisting of scheduled acetaminophen and ibuprofen, with opioid analgesics available as needed per routine clinical care.
Drug: Scheduled Acetaminophen and Ibuprofen
Participants in both study arms will receive scheduled acetaminophen and ibuprofen as part of standard multimodal postoperative analgesia. These medications are administered routinely following transvaginal pelvic reconstructive surgery to reduce baseline pain, minimize opioid requirements, and support enhanced recovery.
Drug: Opioid Analgesics (Tramadol or Oxycodone)

Tramadol: 50 mg orally every 4-6 hours as needed OR

Oxycodone: 5 mg orally every 4-6 hours as needed

Co-administered medications: Scheduled acetaminophen and ibuprofen

Purpose: Standard postoperative analgesia per institutional protocol

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Pain intensity (0-10 NRS) at 48 hours postoperatively
Time Frame: 48 hours postoperatively
Patient-reported postoperative pain intensity measured using the 0-10 Numerical Rating Scale (NRS).
48 hours postoperatively

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Pain Intensity at 1 Week
Time Frame: 1 week after surgery
Patient-reported pain intensity using the 0-10 NRS.
1 week after surgery
Time to Rescue Analgesia in PACU
Time Frame: During stay in post-anesthesia care unit, measured in hours up to 23 hours
Time from arrival in the post-anesthesia care unit to first administration of rescue analgesic medication.
During stay in post-anesthesia care unit, measured in hours up to 23 hours
Post-Discharge Opioid Use
Time Frame: Postoperative days 0-7
Total opioid consumption after discharge, measured in morphine milligram equivalents (MME).
Postoperative days 0-7
Post-Discharge Gabapentin Use
Time Frame: Postoperative days 0-7
Any gabapentin or pregabalin use after discharge.
Postoperative days 0-7
Constipation
Time Frame: Up to 1 week postoperatively

Time to first bowel movement

Additional bowel regimen use
Up to 1 week postoperatively
Nausea and Vomiting
Time Frame: Up to 1 week postoperatively
Incidence of postoperative nausea or vomiting reported by participants.
Up to 1 week postoperatively
Dizziness or Lightheadedness
Time Frame: Up to 1 week postoperatively
Incidence of postoperative dizziness or lightheadedness.
Up to 1 week postoperatively
Time to Return to Driving
Time Frame: Up to 6 weeks
Number of days from surgery until the participant reports resuming driving.
Up to 6 weeks
Time to Return to Work
Time Frame: Up to 6 weeks
Number of days from surgery until the participant reports returning to work.
Up to 6 weeks
Postoperative Patient-Initiated Communication Burden
Time Frame: Up to 6 weeks
Number of patient-initiated messages, calls, or portal contacts related to postoperative pain or medication concerns.
Up to 6 weeks

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
University of California, Los Angeles

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: A Lenore Ackeman, MD, PhD, University of California, Los Angeles

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.

General Publications

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 (Estimated)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
July 1, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
July 1, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
July 1, 2028

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
May 11, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 15, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
May 22, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
June 2, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 29, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
May 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 26-0498

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

The investigators do not plan to share individual participant data (IPD). Due to the sensitive nature of postoperative clinical data and institutional policies regarding patient privacy, de-identified datasets will not be made available. Study findings will be disseminated through aggregate results posted on ClinicalTrials.gov and peer-reviewed publications.

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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