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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: VX-661 Clear all
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 23, 2026, 10:35 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 23, 2026, 10:35 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 23, 2026, 10:35 PM EDT
Completed Phase 3 Interventional Results available

A Study of VX-121 Combination Therapy in Participants With Cystic Fibrosis (CF) Who Are Homozygous for F508del, Heterozygous for F508del and a Gating (F/G) or Residual Function (F/RF) Mutation, or Have At Least 1 Other Triple Combination Responsive (TCR) CFTR Mutation and No F508del Mutation

NCT05076149
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
597 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
62
States / cities
Birmingham, Alabama • Tucson, Arizona • Little Rock, Arkansas + 55 more
Source: ClinicalTrials.gov public record
Updated Jun 12, 2024 · Synced Sep 23, 2026, 10:35 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 23, 2026, 10:35 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 23, 2026, 10:35 PM EDT
Completed Phase 2 Interventional Results available

Study to Evaluate Safety and Efficacy of VX-661 in Combination With Ivacaftor in Subjects With Cystic Fibrosis, Homozygous for the F508del-CFTR Mutation With an Open-Label Expansion

NCT02070744
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-661, Ivacaftor, Placebo matched to VX-661, Placebo matched to Ivacaftor
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
23
States / cities
Birmingham, Alabama • Palo Alto, California • Stanford, California + 20 more
Source: ClinicalTrials.gov public record
Updated Sep 23, 2025 · Synced Sep 23, 2026, 10:35 PM EDT
Completed Phase 4 Interventional

Trikafta for Patients With Non-cystic Fibrosis Bronchiectasis

NCT05743946
View directory record Official record
Conditions
Non-cystic Fibrosis Bronchiectasis
Interventions
Trikafta
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Feb 8, 2026 · Synced Sep 23, 2026, 10:35 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 Sep 20, 2026 · Synced Sep 23, 2026, 10:35 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 23, 2026, 10:35 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 23, 2026, 10:35 PM EDT
Completed Phase 3 Interventional Results available

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

NCT03525574
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
507 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2023
U.S. locations
52
States / cities
Tucson, Arizona • Little Rock, Arkansas • Long Beach, California + 47 more
Source: ClinicalTrials.gov public record
Updated Sep 23, 2025 · Synced Sep 23, 2026, 10:35 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 23, 2026, 10:35 PM EDT
Terminated Phase 4 Interventional Results available

Novel Therapeutic Approaches for Treatment of CF Patients With W1282X Premature Termination Codon Mutations

NCT03624101
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Symdeko, Ivacaftor and Symdeko
Drug
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years and older
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Apr 15, 2025 · Synced Sep 23, 2026, 10:35 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 23, 2026, 10:35 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Effect of Vanzacaftor/Tezacaftor/Deutivacaftor (VNZ/TEZ/D-IVA) on the PK of Rosuvastatin in Healthy Participants

NCT07349394
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VNZ/TEZ/D-IVA, Rosuvastatin
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
18 Years to 55 Years
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
Overland Park, Kansas
Source: ClinicalTrials.gov public record
Updated Apr 1, 2026 · Synced Sep 23, 2026, 10:35 PM EDT
Completed Phase 2 Interventional Results available

A Phase 2 Study to Evaluate Effects of VX-661/Ivacaftor on Lung and Extrapulmonary Systems in Subjects With Cystic Fibrosis, Homozygous for the F508del-CFTR Mutation

NCT02508207
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Tezacaftor/Ivacaftor, Ivacaftor, Tezacaftor/Ivacaftor matching placebo, Ivacaftor matching placebo
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
18 Years and older
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
7
States / cities
Birmingham, Alabama • Indianapolis, Indiana • Baltimore, Maryland + 4 more
Source: ClinicalTrials.gov public record
Updated Jul 18, 2021 · Synced Sep 23, 2026, 10:35 PM EDT
Completed Phase 2 Interventional Results available

A Study to Evaluate the Safety and Efficacy of VX-121 Combination Therapy in Subjects With Cystic Fibrosis

NCT03912233
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-121, TEZ, VX-561, TEZ/IVA, IVA, Placebo
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
18 Years and older
Enrollment
87 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
12
States / cities
Los Angeles, California • Oakland, California • Lexington, Kentucky + 9 more
Source: ClinicalTrials.gov public record
Updated Apr 19, 2023 · Synced Sep 23, 2026, 10:35 PM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

Dose Escalation Study Evaluating the Safety and Pharmacokinetics of VX-272 in Healthy Participants

NCT07437105
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-272, Placebo, Tezacaftor, Deutivacaftor
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
18 Years to 55 Years
Enrollment
160 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Sep 22, 2026 · Synced Sep 23, 2026, 10:35 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

An Electrocardiogram Study to Evaluate the Effect of Vanzacaftor on the QT/QTc Interval in Healthy Participants

NCT05867147
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Vanzacaftor, Vanzacaftor Placebo, Moxifloxacin, Moxifloxacin Placebo
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
18 Years to 45 Years
Enrollment
56 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Jul 13, 2023 · Synced Sep 23, 2026, 10:35 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 23, 2026, 10:35 PM EDT
Completed Phase 3 Interventional Results available

A Study to Evaluate the Pharmacokinetics, Safety, and Tolerability of VX-661/Ivacaftor in Pediatric Subjects With Cystic Fibrosis (CF)

NCT02953314
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
TEZ, TEZ/IVA, IVA
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
6 Years to 11 Years
Enrollment
83 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
30
States / cities
Birmingham, Alabama • Anchorage, Alaska • Little Rock, Arkansas + 27 more
Source: ClinicalTrials.gov public record
Updated Mar 3, 2020 · Synced Sep 23, 2026, 10:35 PM EDT
Completed Phase 3 Interventional Results available

A Phase 3 Study of VX-445 Combination Therapy in Cystic Fibrosis (CF) Subjects Heterozygous for F508del and a Gating or Residual Function Mutation (F/G and F/RF Genotypes)

NCT04058353
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
ELX/TEZ/IVA, IVA, TEZ/IVA
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
12 Years and older
Enrollment
271 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
37
States / cities
Birmingham, Alabama • Tucson, Arizona • Long Beach, California + 32 more
Source: ClinicalTrials.gov public record
Updated Jul 1, 2021 · Synced Sep 23, 2026, 10:35 PM EDT
Completed Phase 2 Interventional Results available

A Study Evaluating the Safety of VX-152 Combination Therapy in Adults With Cystic Fibrosis

NCT02951195
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-152, TEZ/IVA, IVA, Placebo
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
16
States / cities
Birmingham, Alabama • La Jolla, California • Los Angeles, California + 13 more
Source: ClinicalTrials.gov public record
Updated Jan 27, 2021 · Synced Sep 23, 2026, 10:35 PM EDT