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VX-828

Phase 1

Cystic Fibrosis | Small molecule | Respiratory |Vertex Pharmaceuticals Incorporated|Last Updated: May 26, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedDouble-BlindPLACEBO_CONTROLLEDBiomarker
Total Trials2
Total Enrollment233
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06861413A Phase 1 Study to Evaluate the Relative Bioavailability of a VX-828 Tablet FormulationPHASE1 COMPLETED 68Apr 1, 2025May 5, 2025Jun 4, 20251 United States
NCT06154447Evaluation of VX-828 in Healthy Participants and in Participants With Cystic FibrosisPHASE1 ACTIVE NOT_RECRUITING 165Dec 12, 2023Jul 16, 2026May 26, 202612 United States
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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 — 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)
HIGHMay 27, 2026NCT06154447Status: RECRUITING → ACTIVE_NOT_RECRUITING
HIGHMay 27, 2026NCT06154447Status: RECRUITING → ACTIVE_NOT_RECRUITING
LOWMay 26, 2026NCT06154447primaryCompletionDate: changed
LOWMay 24, 2026NCT06154447studyFirstPostDate: changed