PainPhase 1NCT07570069
Effects of Efavirenz on the Pharmacokinetics of Suzetrigine in Healthy Participants
A Phase 1 study testing Suzetrigine and Efavirenz in people with Pain, run by Vertex Pharmaceuticals Incorporated at 1 site in United States.
Trial summary
The purpose of the study is to evaluate the pharmacokinetics (PK) of Suzetrigine (SUZ) and its metabolite in the absence and presence of efavirenz, a moderate CYP3A inducer. In addition, the purpose is to evaluate the safety and tolerability of SUZ when administered in the absence and presence of efavirenz. Read more about this study
- Who is it for?
- Ages 18 to 55 yearsHealthy volunteers can take part
- Conditions the study is for
- Pain
- What is being tested?
- Suzetrigine and Efavirenz
- Type of treatment
- Pill or oral medicine
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 18 participants
- Where
- 1 siteUnited States
- Study dates
- 7 May 2026to 16 Jul 2026
- Phase
- Phase 1
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 55 years
- All sexes
- Healthy volunteers accepted
- Adult
Who may be able to join
- Body mass index (BMI) of 18.0 to 32.0 kilogram per meter square (kg/m^2)
- A total body weight of greater than (>) 50 kg
- Males and females of non-childbearing potential
Who cannot join
- History of any illness or any clinical condition that may confound the results of the study or pose an additional risk in administering study drug to the participant
- History of febrile illness or other acute illness that has not fully resolved within 5 days before the first dose of study drug
- Any condition possibly affecting drug absorption
- Other protocol defined Inclusion/Exclusion criteria may apply.
Trial locations and contacts
1 site in 1 country.
United States1 site
ICON - Utah - Salt Lake City Office
Salt Lake City, Utah, 84124
About this study
Official title: A Phase 1, Open-label Drug-drug Interaction Study to Evaluate the Effects of Efavirenz on the Pharmacokinetics of Suzetrigine in Healthy Subjects
The purpose of the study is to evaluate the pharmacokinetics (PK) of Suzetrigine (SUZ) and its metabolite in the absence and presence of efavirenz, a moderate CYP3A inducer. In addition, the purpose is to evaluate the safety and tolerability of SUZ when administered in the absence and presence of efavirenz.
Read the detailed description
The study is being conducted to evaluate the effects of efavirenz on the PK of SUZ in healthy participants and consists of Screening Phase, Treatment Phase and Safety Follow-up Phase. Participants will receive study medication for a duration of 30 days.
Note: This clinical trial information was submitted voluntarily under the applicable law and, therefore, certain submission deadlines may not apply. (That is, clinical trial information for this applicable clinical trial was submitted under section 402(j)(4)(A) of the Public Health Service Act and 42 CFR 11.60 and is not subject to the deadlines established by sections 402(j)(2) and (3) of the Public Health Service Act or 42 CFR 11.24 and 11.44.).
- Conditions
- Pain
- Being tested
- Suzetrigine, Efavirenz
- Medical subject headings
- Pain
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
SuzetrigineDrug
Also called SUZ, Journavx
Tablet for oral administration.
EfavirenzDrug
Tablet for oral administration.
| Study group | Role | What they receive |
|---|---|---|
| SUZ and Efavirenz | Experimental | Participants will receive a single dose of SUZ on Days 1 through 15. Participants will also receive a single dose of SUZ in the morning followed by a single dose of efavirenz in the evening on Days 16 through 30. Receives: Drug: Suzetrigine; Drug: Efavirenz |
What is being measured
The primary outcome is the main question the study is designed to answer.
Maximum Observed Plasma Concentration (Cmax) of SUZ and its Metabolite in the Absence and Presence of Efavirenz
Measured: Day 15 and Day 30
Area Under the Concentration Versus Time Curve During a Dosing Interval (AUCτ) of SUZ and its Metabolite in the Absence and Presence of Efavirenz
Measured: Day 15 and Day 30
Secondary outcomes (1)
Safety and Tolerability as Assessed by Number of Participants with Adverse Events (AEs) and Serious Adverse Events (SAEs)
Measured: From Day 1 up to Day 46
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted6 May 2026
- Study start7 May 2026
- Primary completion16 Jul 2026
- Study completion16 Jul 2026
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for PainStudies of the same condition, open and under way.
- More trials run by Vertex Pharmaceuticals IncorporatedThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 1
- Primary purpose
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Enrolment
- 18 participants (actual)
Sponsor and investigators
- Lead sponsor
- Vertex Pharmaceuticals Incorporated
- Sponsor type
- Industry (pharma, biotech, devices)
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07570069
- Sponsor's protocol ID
- VX24-548-018
- Status last verified
- Aug 2026
- First submitted
- 29 Apr 2026
- Last updated
- 18 Aug 2026
- Results posted
- No
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
- Individual data sharing
- No: Details on Vertex data sharing criteria and process for requesting access can be found at: https://www.vrtx.com/our-science/clinical-trials-data-sharing/
Study at a glance
From the registry record, last updated by the sponsor on 18 Aug 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Phase 1, Open-label Drug-drug Interaction Study to Evaluate the Effects of Efavirenz on the Pharmacokinetics of Suzetrigine in Healthy Subjects
- ClinicalTrials.gov ID
- NCT07570069
- Acronym / sponsor ID
- VX24-548-018
- Conditions
- Pain
- Phase
- Phase 1
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 18 participants (actual)
- Lead sponsor
- Vertex Pharmaceuticals IncorporatedIndustry (pharma, biotech, devices)
- Study start
- 7 May 2026 (actual)
- Primary completion
- 16 Jul 2026 (actual)
- Study completion
- 16 Jul 2026 (actual)
- First posted
- 6 May 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The purpose of the study is to evaluate the pharmacokinetics (PK) of Suzetrigine (SUZ) and its metabolite in the absence and presence of efavirenz, a moderate CYP3A inducer. In addition, the purpose is to evaluate the safety and tolerability of SUZ when administered in the absence and presence of efavirenz.
Detailed description
The study is being conducted to evaluate the effects of efavirenz on the PK of SUZ in healthy participants and consists of Screening Phase, Treatment Phase and Safety Follow-up Phase. Participants will receive study medication for a duration of 30 days.
Note: This clinical trial information was submitted voluntarily under the applicable law and, therefore, certain submission deadlines may not apply. (That is, clinical trial information for this applicable clinical trial was submitted under section 402(j)(4)(A) of the Public Health Service Act and 42 CFR 11.60 and is not subject to the deadlines established by sections 402(j)(2) and (3) of the Public Health Service Act or 42 CFR 11.24 and 11.44.).
Study design
- Primary purpose
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| SUZ and Efavirenz | Experimental | Drug: Suzetrigine, Drug: EfavirenzParticipants will receive a single dose of SUZ on Days 1 through 15. Participants will also receive a single dose of SUZ in the morning followed by a single dose of efavirenz in the evening on Days 16 through 30. |
Who may qualify
- Ages
- 18 to 55 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult
Key inclusion criteria (3 listed)
- Body mass index (BMI) of 18.0 to 32.0 kilogram per meter square (kg/m^2)
- A total body weight of greater than (>) 50 kg
- Males and females of non-childbearing potential
Key exclusion criteria (4 listed)
- History of any illness or any clinical condition that may confound the results of the study or pose an additional risk in administering study drug to the participant
- History of febrile illness or other acute illness that has not fully resolved within 5 days before the first dose of study drug
- Any condition possibly affecting drug absorption
- Other protocol defined Inclusion/Exclusion criteria may apply.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| SuzetrigineAlso: SUZ, JournavxTablet for oral administration. | Drug | SUZ and Efavirenz |
| EfavirenzTablet for oral administration. | Drug | SUZ and Efavirenz |
Primary outcome
Maximum Observed Plasma Concentration (Cmax) of SUZ and its Metabolite in the Absence and Presence of Efavirenz
Time frame: Day 15 and Day 30
Area Under the Concentration Versus Time Curve During a Dosing Interval (AUCτ) of SUZ and its Metabolite in the Absence and Presence of Efavirenz
Time frame: Day 15 and Day 30
1 secondary outcome
Safety and Tolerability as Assessed by Number of Participants with Adverse Events (AEs) and Serious Adverse Events (SAEs)
Time frame: From Day 1 up to Day 46
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 18 Aug 2026.
- Individual participant dataSharing planned: No. Details on Vertex data sharing criteria and process for requesting access can be found at: https://www.vrtx.com/our-science/clinical-trials-data-sharing/
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 1 study testing Suzetrigine and Efavirenz in people with Pain, run by Vertex Pharmaceuticals Incorporated at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 3 inclusion and 4 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 18 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Maximum Observed Plasma Concentration (Cmax) of SUZ and its Metabolite in the Absence and Presence of Efavirenz (time frame: Day 15 and Day 30). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 18 Aug 2026.