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Showing 1–24 of 61 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: VX-661 Clear all
Completed Phase 2 Interventional Results available

A Study Evaluating the Safety and Efficacy of VX-440 Combination Therapy in Subjects With Cystic Fibrosis

NCT02951182
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
TEZ, IVA, VX-440, Matched Placebo
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
12 Years and older
Enrollment
74 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
22
States / cities
Tucson, Arizona • Palo Alto, California • San Francisco, California + 18 more
Source: ClinicalTrials.gov public record
Updated Aug 27, 2020 · Synced Sep 3, 2026, 4:56 PM EDT
Completed Phase 3 Interventional Results available

Evaluation of VX 445/TEZ/IVA in Cystic Fibrosis Subjects 6 Through 11 Years of Age

NCT03691779
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
ELX/TEZ/IVA, IVA
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
6 Years to 11 Years
Enrollment
71 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
13
States / cities
Orange, California • Aurora, Colorado • Chicago, Illinois + 10 more
Source: ClinicalTrials.gov public record
Updated Oct 21, 2021 · Synced Sep 3, 2026, 4:56 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Evaluation of VX-828 in Healthy Participants and in Participants With Cystic Fibrosis

NCT06154447
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-828, Placebo, Itraconazole, Midazolam, Tezacaftor, VX-118, Deutivacaftor
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
18 Years and older
Enrollment
165 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
12
States / cities
Hollywood, Florida • Orlando, Florida • Overland Park, Kansas + 9 more
Source: ClinicalTrials.gov public record
Updated Aug 9, 2026 · Synced Sep 3, 2026, 4:56 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study To Evaluate the Relative Bioavailability, Food Effect, and Dose Proportionality of a Granule Formulation of Vanzacaftor/Tezacaftor/Deutivacaftor(VNZ/TEZ/D-IVA)

NCT06299709
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VNZ/TEZ/D-IVA
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
18 Years to 55 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Sep 25, 2025 · Synced Sep 3, 2026, 4:56 PM EDT
Terminated Phase 3 Interventional Results available

Evaluation of VX-659/TEZ/IVA in Cystic Fibrosis Subjects 6 Through 11 Years of Age

NCT03633526
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-659/TEZ/IVA, IVA
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
6 Years to 11 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
6
States / cities
Aurora, Colorado • Chicago, Illinois • Kansas City, Missouri + 3 more
Source: ClinicalTrials.gov public record
Updated Feb 4, 2020 · Synced Sep 3, 2026, 4:56 PM EDT
Active, not recruiting Phase 3 Interventional

Evaluation of VX-121/Tezacaftor/Deutivacaftor in Cystic Fibrosis (CF) Participants 1 Through 11 Years of Age

NCT05422222
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-121/TEZ/D-IVA
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
1 Year to 11 Years
Enrollment
210 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2030
U.S. locations
19
States / cities
Orange, California • Palo Alto, California • Aurora, Colorado + 16 more
Source: ClinicalTrials.gov public record
Updated May 27, 2026 · Synced Sep 3, 2026, 4:56 PM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

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

NCT07283770
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-581, Placebo, D-IVA, TEZ
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
18 Years to 55 Years
Enrollment
136 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
Overland Park, Kansas
Source: ClinicalTrials.gov public record
Updated Jul 15, 2026 · Synced Sep 3, 2026, 4:56 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Impact of Rifabutin on the Pharmacokinetics of Elexacaftor/Tezacaftor/Ivacaftor

NCT04840862
View directory record Official record
Conditions
Drug Drug Interaction
Interventions
Trikafta [orange tablet containing ELX 100mg, TEZ 50mg, and IVA 75mg], Rifabutin 300mg
Drug
Lead sponsor
University of Southern California
Other
Eligibility
18 Years to 65 Years
Enrollment
6 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Aug 8, 2024 · Synced Sep 3, 2026, 4:56 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study of Vanzacaftor/Tezacaftor/Deutivacaftor (VNZ/TEZ/D-IVA) in Healthy Adult Panelists

NCT06299696
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VNZ/TEZ/D-IVA
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
25 Years to 80 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Woburn, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 15, 2024 · Synced Sep 3, 2026, 4:56 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Pharmacokinetics and Safety Assessment of VX-121/Tezacaftor/Deutivacaftor in Participants With Moderate Hepatic Impairment

NCT05437120
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-121/TEZ/D-IVA
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
18 Years to 70 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
2
States / cities
Miami, Florida • St. Petersburg, Florida
Source: ClinicalTrials.gov public record
Updated Mar 29, 2023 · Synced Sep 3, 2026, 4:56 PM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

A Study of VX-445 in Healthy Subjects and Subjects With Cystic Fibrosis

NCT03227471
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
IVA, TEZ/IVA, VX-445, Matched Placebo, TEZ, VX-561
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
18 Years and older
Enrollment
225 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
26
States / cities
Tucson, Arizona • Little Rock, Arkansas • Madera, California + 23 more
Source: ClinicalTrials.gov public record
Updated Jan 17, 2022 · Synced Sep 3, 2026, 4:56 PM EDT
Recruiting Early Phase 1 Interventional

Personalized Theratyping Trial

NCT03587961
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Symdeko
Drug
Lead sponsor
George Solomon
Other
Eligibility
6 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2027
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Feb 1, 2026 · Synced Sep 3, 2026, 4:56 PM EDT
Completed Phase 3 Interventional Results available

A Randomized, Double-Blind, Placebo-Controlled, Parallel-Group Study to Evaluate the Efficacy and Safety of VX-661 in Combination With Ivacaftor

NCT02347657
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-661 Plus Ivacaftor Combination, Ivacaftor, VX-661 Plus Ivacaftor Combination Placebo, Ivacaftor placebo
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
12 Years and older
Enrollment
510 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
27
States / cities
Little Rock, Arkansas • Long Beach, California • Denver, Colorado + 24 more
Source: ClinicalTrials.gov public record
Updated Jun 11, 2018 · Synced Sep 3, 2026, 4:56 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study to Evaluate the Relative Bioavailability of a Fixed-dose Combination Tablet of VX-121/Tezacaftor/Deutivacaftor

NCT05535959
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-121/TEZ/D-IVA
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
18 Years to 55 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Dec 11, 2022 · Synced Sep 3, 2026, 4:56 PM EDT
Not listed No phase listed Observational

Simultaneous quanTification of Elexacaftor/tezAcaftor/Ivacaftor Via Reverse Phase High Performance liquiD chromatographY

NCT05822102
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Not listed
Lead sponsor
National Jewish Health
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023
U.S. locations
2
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Jul 23, 2023 · Synced Sep 3, 2026, 4:56 PM EDT
Completed Phase 3 Interventional Results available

A Study of VX-659 Combination Therapy in CF Subjects Homozygous for F508del (F/F)

NCT03460990
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-659/TEZ/IVA, TEZ/IVA, IVA, Placebo
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
12 Years and older
Enrollment
116 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
28
States / cities
Birmingham, Alabama • New Haven, Connecticut • Miami, Florida + 25 more
Source: ClinicalTrials.gov public record
Updated Oct 16, 2019 · Synced Sep 3, 2026, 4:56 PM EDT
Recruiting No phase listed Observational

Study to Evaluate Biological & Clinical Effects of Significantly Corrected CFTR Function in Infants & Young Children

NCT04509050
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Ivacaftor or elexacaftor/tezacaftor/ivacaftor
Drug
Lead sponsor
Sonya Heltshe
Other
Eligibility
Up to 10 Years
Enrollment
210 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2027
U.S. locations
35
States / cities
Birmingham, Alabama • Palo Alto, California • Aurora, Colorado + 31 more
Source: ClinicalTrials.gov public record
Updated Jul 7, 2026 · Synced Sep 3, 2026, 4:56 PM EDT
Enrolling by invitation No phase listed Observational

Glucose Metabolism in Cystic Fibrosis Related Diabetes (CFRD)

NCT07102043
View directory record Official record
Conditions
Cystic Fibrosis Related Diabetes
Interventions
Not listed
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
21 Years to 75 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Aug 2, 2026 · Synced Sep 3, 2026, 4:56 PM EDT
Completed Phase 3 Interventional Results available

A Phase 3 Study of VX-121 Combination Therapy in Participants With Cystic Fibrosis (CF) Heterozygous for F508del and a Minimal Function Mutation (F/MF)

NCT05033080
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-121/TEZ/D-IVA, ELX/TEZ/IVA, IVA, Placebo (matched to VX-121/TEZ/D-IVA), Placebo (matched to ELX/TEZ/IVA), Placebo (matched to IVA)
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
12 Years and older
Enrollment
435 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
69
States / cities
Birmingham, Alabama • Tucson, Arizona • Little Rock, Arkansas + 61 more
Source: ClinicalTrials.gov public record
Updated Oct 2, 2024 · Synced Sep 3, 2026, 4:56 PM EDT
Completed Phase 3 Interventional Results available

A Study of VX-445 Combination Therapy in CF Subjects Homozygous for F508del (F/F)

NCT03525548
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-445/TEZ/IVA, TEZ/IVA, IVA, Placebo
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
12 Years and older
Enrollment
113 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
28
States / cities
Tucson, Arizona • Little Rock, Arkansas • Long Beach, California + 24 more
Source: ClinicalTrials.gov public record
Updated Jan 26, 2020 · Synced Sep 3, 2026, 4:56 PM EDT
Completed Phase 2 Interventional Results available

Trikafta in Cystic Fibrosis Patients

NCT03506061
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Trikafta
Drug
Lead sponsor
Emory University
Other
Eligibility
12 Years and older
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
2
States / cities
Birmingham, Alabama • Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Aug 10, 2026 · Synced Sep 3, 2026, 4:56 PM EDT
Completed No phase listed Observational

A Decentralized Study to Evaluate Physical Activity and Cough Frequency Using Wearable Technology in Cystic Fibrosis

NCT04923464
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Not listed
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
18 Years and older
Enrollment
51 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
11
States / cities
Denver, Colorado • New Haven, Connecticut • Orlando, Florida + 8 more
Source: ClinicalTrials.gov public record
Updated Jan 18, 2022 · Synced Sep 3, 2026, 4:56 PM EDT
Completed Phase 3 Interventional Results available

A Study to Evaluate the Efficacy and Safety of VX-661 in Combination With Ivacaftor in Subjects Aged 12 Years and Older With Cystic Fibrosis, Heterozygous for the F508del-CFTR Mutation

NCT02516410
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-661 plus ivacaftor combination, Ivacaftor, Placebo (matched to VX-661 plus ivacaftor combination), Placebo (matched to ivacaftor)
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
12 Years and older
Enrollment
168 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
22
States / cities
Birmingham, Alabama • La Jolla, California • Los Angeles, California + 19 more
Source: ClinicalTrials.gov public record
Updated Jun 11, 2018 · Synced Sep 3, 2026, 4:56 PM EDT
Completed Phase 3 Interventional Results available

Study Evaluating the Long-term Safety and Efficacy of VX-445 Combination Therapy

NCT04058366
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
ELX/TEZ/IVA, IVA
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
12 Years and older
Enrollment
251 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
33
States / cities
Tucson, Arizona • Long Beach, California • Palo Alto, California + 28 more
Source: ClinicalTrials.gov public record
Updated Jan 15, 2024 · Synced Sep 3, 2026, 4:56 PM EDT