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VX-828

Phase 1

Cystic Fibrosis | Small molecule | Respiratory |Vertex Pharmaceuticals Incorporated|Last Updated: Aug 10, 2026

Success Probability

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLED
Total Trials2
Total Enrollment233

FDA Designations

No designations recorded

Clinical trial landscape

VX-828 · 2 trials · 1 indication

Phase 1 2
NCT06861413A Phase 1 Study to Evaluate the Relative Bioavailability of a VX-828 Tablet FormulationCystic Fibrosis
COMPLETED68 Analytics
NCT06154447Evaluation of VX-828 in Healthy Participants and in Participants With Cystic FibrosisCystic Fibrosis
COMPLETED165 Analytics
PHASE1COMPLETED
A Phase 1 Study to Evaluate the Relative Bioavailability of a VX-828 Tablet Formulation
Cystic FibrosisUnlock trial analytics
PHASE1COMPLETED
Evaluation of VX-828 in Healthy Participants and in Participants With Cystic Fibrosis
Cystic FibrosisUnlock trial analytics

Study Endpoints

Primary Endpoints

Area Under the Concentration Versus Time Curve from the Time of dosing to the Last Measurable Concentration (AUC0-tlast) of VX-828 in Plasma
From Day 1 up to Day 24
Maximum Observed Concentration (Cmax) of VX-828 in Plasma
From Day 1 up to Day 24
Part A: Safety and Tolerability as Assessed by Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)
From Signing of Informed Consent Form (ICF) up to Safety Follow Up (Up to Day 67)
Part B: Safety and Tolerability as Assessed by Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)
From Signing of Informed Consent Form (ICF) up to Safety Follow Up (Up to Day 80)
Part D: Safety and Tolerability as Assessed by Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)
From Signing of Informed Consent Form (ICF) up to Safety Follow Up (Up to Day 80)
Part E: Safety and Tolerability as Assessed by Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)
From Signing of Informed Consent Form (ICF) up to End of Study (Up to Day 111)
Part C: Maximum Observed Concentration (Cmax) of VX-828 in Plasma in the Absence and Presence of Itraconazole
From Day 1 up to Day 71
Part C: Area Under the Concentration Versus Time Curve (AUC) of VX-828 in Plasma in the Absence and Presence of Itraconazole
From Day 1 up to Day 71
Part C: Maximum Observed Concentration (Cmax) of Midazolam in Plasma in the Absence and Presence of VX-828/TEZ/D-IVA
From Day 1 up to Day 30
Part C: Area Under the Concentration Versus Time Curve (AUC) of Midazolam in Plasma in the Absence and Presence of VX-828/TEZ/D-IVA
From Day 1 up to Day 30

Secondary Endpoints

Safety and Tolerability as Assessed by Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)
From Signing of Informed Consent Form (ICF) up to Safety Follow Up (Up to Day 36)
Part A: Maximum Observed Concentration (Cmax) of VX-828 in Plasma
From Day 1 up to Day 67
Part A: Area Under the Concentration Versus Time Curve (AUC) of VX-828 in Plasma
From Day 1 up to Day 67
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort 1ACTIVE_COMPARATORParticipants will be randomized to receive a single dose of VX-828 suspension.
Cohort 2EXPERIMENTALParticipants will be randomized to receive a single dose of VX-828 tablets.
Part A: Single Ascending Dose (SAD)EXPERIMENTALParticipants will be randomized to receive a single dose of different dose levels of VX-828.
Part A: PlaceboPLACEBO_COMPARATORParticipants will be randomized to receive placebo matched to VX-828.
Part B: Multiple Ascending Dose (MAD)EXPERIMENTALParticipants will be randomized to receive multiple doses of different dose levels of VX-828. The dose levels will be determined based on the data from Part A.
Part B: PlaceboPLACEBO_COMPARATORParticipants will be randomized to receive placebo matched to VX-828.
Part C: Drug Drug InteractionEXPERIMENTALParticipants will receive a single dose of VX-828, followed by a washout period, Itraconazole administration, and concomitant administration of itraconazole and VX-828; or participants will receive Midazolam followed by VX-828/TEZ/D-IVA administration, and concomitant administration of VX-828/TEZ/D-IVA and Midazolam. Part C will be an open-label optional cohort.
Part D: VX-828 in combination with TEZ/VX-118 ,TEZ/D-IVA or D-IVAEXPERIMENTALParticipants will be randomized to receive VX-828 in combination with TEZ/VX-118, TEZ/D-IVA, or D-IVA.
Part D: PlaceboPLACEBO_COMPARATORParticipants will be randomized to receive placebo matched to VX-828/TEZ/VX-118 or placebo matched to VX-828 in combination with TEZ/D-IVA or D-IVA
Part E: VX-828 in Combination with D-IVA with or without TEZ in CFEXPERIMENTALParticipants with cystic fibrosis will receive VX-828 in combination with D-IVA with or without TEZ.

Interventions

NameTypeDescription
VX-828DRUGTablets for Oral Administration.
PlaceboDRUGSuspension for Oral Administration
ItraconazoleDRUGSolution for Oral Administration
MidazolamDRUGSyrup for Oral Administration
TezacaftorDRUGTablets for Oral Administration
VX-118DRUGTablets for Oral Administration
DeutivacaftorDRUGTablets for Oral Administration
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Eligibility Criteria

Age Range18 Years to 55 Years
SexALL
Healthy VolunteersYes
Study Sites1

Key Inclusion Criteria: * Body mass index (BMI) of 18.0 to 32.0 kilogram per square meter (kg/m\^2) * A total body weight of more than (\>) 50 Kg * Nonsmoker or ex-smoker for at least 3 months before screening * Participants of non-childbearing potential Key Exclusion Criteria: * History of febri...

Countries:United States
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Recent Changes (Last 90 Days)

HIGHAug 11, 2026NCT06154447Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHAug 11, 2026NCT06154447Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHAug 11, 2026NCT06154447Status: ACTIVE_NOT_RECRUITING → COMPLETED

Frequently asked questions about VX-828

What is VX-828 used for?

VX-828 is an investigational small molecule being developed for the treatment of cystic fibrosis. It is currently in Phase 1 clinical development and has been evaluated in healthy participants and in participants with cystic fibrosis in clinical trials conducted in the United States.

Who makes VX-828?

VX-828 is being developed by Vertex Pharmaceuticals Incorporated, a biopharmaceutical company traded on the NASDAQ under the ticker symbol VRTX. The company is conducting Phase 1 clinical trials to evaluate the drug's safety, tolerability, and pharmacokinetics in healthy volunteers and in patients with cystic fibrosis.

What phase is VX-828 in?

VX-828 is in Phase 1 clinical development. Two Phase 1 trials have been completed, with a total enrollment of 233 participants. The drug is investigational and has not been approved by regulatory authorities. It is being studied for the treatment of cystic fibrosis.

What clinical trials is VX-828 in?

VX-828 has been studied in two completed Phase 1 clinical trials. The first trial, NCT06154447, evaluated VX-828 in healthy participants and in participants with cystic fibrosis, enrolling 165 individuals. The second trial, NCT06861413, assessed the relative bioavailability of a VX-828 tablet formulation and enrolled 68 participants.

Is VX-828 the same as any other drug?

VX-828 is a distinct investigational drug candidate developed by Vertex Pharmaceuticals. No alternative names have been reported for this compound. It is a small molecule being studied for cystic fibrosis and is not known to be identical to any other marketed or investigational medication.