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Showing 1–22 of 22 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Placebo matched to VX-661 Clear all
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 28, 2026, 8:49 PM EDT
Completed Phase 3 Interventional Results available

A Phase 3 Study of VX-445 Combination Therapy in Subjects With Cystic Fibrosis Heterozygous for the F508del Mutation and a Minimal Function Mutation (F/MF)

NCT03525444
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-445/TEZ/IVA, IVA, Placebo
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
12 Years and older
Enrollment
405 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
53
States / cities
Tucson, Arizona • Little Rock, Arkansas • Long Beach, California + 48 more
Source: ClinicalTrials.gov public record
Updated May 18, 2020 · Synced Sep 28, 2026, 8:49 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 28, 2026, 8:49 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 28, 2026, 8:49 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 28, 2026, 8:49 PM EDT
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 28, 2026, 8:49 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 28, 2026, 8:49 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 28, 2026, 8:49 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 28, 2026, 8:49 PM EDT
Completed Phase 3 Interventional Results available

A Study to Evaluate Safety, Efficacy, and Tolerability of TEZ/IVA in Orkambi® (Lumacaftor/Ivacaftor) -Experienced Subjects With Cystic Fibrosis (CF)

NCT03150719
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Tezacaftor/Ivacaftor, Ivacaftor, Placebo
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
12 Years and older
Enrollment
98 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
41
States / cities
Birmingham, Alabama • Phoenix, Arizona • Fresno, California + 34 more
Source: ClinicalTrials.gov public record
Updated Sep 11, 2019 · Synced Sep 28, 2026, 8:49 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 28, 2026, 8:49 PM EDT
Completed Phase 3 Interventional Results available

A Phase 3 Study of VX-659 Combination Therapy in Subjects With Cystic Fibrosis Heterozygous for the F508del Mutation and a Minimal Function Mutation (F/MF)

NCT03447249
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-659/TEZ/IVA, IVA, Placebo
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
12 Years and older
Enrollment
385 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
48
States / cities
Birmingham, Alabama • Palo Alto, California • Aurora, Colorado + 44 more
Source: ClinicalTrials.gov public record
Updated Mar 12, 2020 · Synced Sep 28, 2026, 8:49 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 28, 2026, 8:49 PM EDT
Completed Phase 2 Interventional Results available

Study of VX-661 Alone and in Combination With Ivacaftor in Subjects Homozygous or Heterozygous to the F508del-Cystic Fibrosis Transmembrane Conductance Regulator(CFTR) Mutation

NCT01531673
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
12 Years and older
Enrollment
194 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
19
States / cities
Birmingham, Alabama • Oakland, California • Boise, Idaho + 16 more
Source: ClinicalTrials.gov public record
Updated Apr 12, 2018 · Synced Sep 28, 2026, 8:49 PM EDT
Completed Phase 2 Interventional Results available

A Study Evaluating the Safety and Efficacy of VX-659 Combination Therapy in Subjects With Cystic Fibrosis

NCT03224351
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-659, TEZ/IVA, IVA, Placebo (matched to VX-659/TEZ/IVA), TEZ, VX-561, Placebo (matched to VX-659/TEZ/VX-561)
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
18 Years and older
Enrollment
124 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
25
States / cities
New Haven, Connecticut • Miami, Florida • Morton Grove, Illinois + 22 more
Source: ClinicalTrials.gov public record
Updated Apr 21, 2021 · Synced Sep 28, 2026, 8:49 PM EDT
Completed Phase 3 Interventional Results available

A Phase 3 Study to Evaluate the Efficacy and Safety of Ivacaftor and VX-661 in Combination With Ivacaftor in Subjects Aged 12 Years and Older With Cystic Fibrosis, Heterozygous for the F508del-cystic Fibrosis Transmembrane Conductance Regulator (CFTR) Mutation

NCT02392234
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
VX-661/Ivacaftor, Ivacaftor, Placebo matched to VX-661/ ivacaftor, Placebo matched to Ivacaftor
Drug
Lead sponsor
Vertex Pharmaceuticals Incorporated
Industry
Eligibility
12 Years and older
Enrollment
248 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
47
States / cities
Birmingham, Alabama • Phoenix, Arizona • Tucson, Arizona + 44 more
Source: ClinicalTrials.gov public record
Updated Jun 11, 2018 · Synced Sep 28, 2026, 8:49 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 28, 2026, 8:49 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 28, 2026, 8:49 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 28, 2026, 8:49 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 28, 2026, 8:49 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 28, 2026, 8:49 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 28, 2026, 8:49 PM EDT