RecruitingPhase 1

Dose Escalation Study Evaluating the Safety and Pharmacokinetics of VX-581 in Healthy Participants

United States128 participantsStarted 2025-12-09

Plain-language summary

The purpose of this study is to evaluate the safety, tolerability, and pharmacokinetics of single and multiple ascending doses of VX-581.

Who can participate

Age range

18 Years – 55 Years

Sex

ALL

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

Key Inclusion Criteria: * Body mass index (BMI) of 18.0 to 32.0 kilogram per meter square (kg/m\^2) * A total body weight of more than (\>) 50 kg * Male and Female participants of non-childbearing potential Key Exclusion Criteria: * History of febrile illness or other acute illness that has not fully resolved within 14 days before the first dose of study drug * Any condition possibly affecting drug absorption Other protocol defined Inclusion/Exclusion criteria may apply.

Questions worth asking your doctor

Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.

1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?

Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.

Questions for the trial coordinator

The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.

1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?

A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.

What they're measuring

Part A: Safety and Tolerability as Assessed by Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)

Timeframe: From Day -1 up to Day 8

Part B: Safety and Tolerability as Assessed by Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)

Timeframe: From Day -1 up to Day 17

Trial details

NCT IDNCT07283770

SponsorVertex Pharmaceuticals Incorporated

Sponsor typeINDUSTRY

Study typeINTERVENTIONAL

Primary completion2026-11-19

Contact for this trial

Medical Information

617-341-6777 medicalinfo@vrtx.com

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