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ClinicalTrials.gov public records Last synced Oct 16, 2026, 1:07 PM EDT

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Showing 1–24 of 28 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Ritlecitinib Clear all
Completed No phase listed Observational

A Study to Learn About the Medicine Called Ritlecitinib in Adults With Severe Alopecia Areata in Real-world Settings

NCT07200128
View directory record Official record
Conditions
Severe Alopecia Areata
Interventions
Ritlecitinib
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older
Enrollment
123 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 10, 2026 · Synced Oct 16, 2026, 1:07 PM EDT
Completed Phase 3 Interventional

A 52-Week Study of Ritlecitinib Oral Capsules in Adults and Adolescents With Nonsegmental Vitiligo (Active and Stable) Tranquillo

NCT05583526
View directory record Official record
Conditions
Stable Nonsegmental Vitiligo, Active Nonsegmental Vitiligo
Interventions
Ritlecitinib, Placebo
Drug
Lead sponsor
Pfizer
Industry
Eligibility
12 Years and older
Enrollment
607 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
46
States / cities
Birmingham, Alabama • Encinitas, California • Huntington Beach, California + 31 more
Source: ClinicalTrials.gov public record
Updated Feb 27, 2026 · Synced Oct 16, 2026, 1:07 PM EDT
Recruiting Phase 3 Interventional

A Study in Young People and Adults to Learn About the Medicine Ritlecitinib for Treatment of Patchy Hair Loss, Known by the Medical Term as Moderate Alopecia Areata

NCT07733765
View directory record Official record
Conditions
Alopecia Areata
Interventions
Ritlecitinib 100 mg, Ritlecitinib 50 mg, Placebo
Drug · Other
Lead sponsor
Pfizer
Industry
Eligibility
12 Years and older
Enrollment
336 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
17
States / cities
Encinitas, California • Miami, Florida • Skokie, Illinois + 11 more
Source: ClinicalTrials.gov public record
Updated Sep 10, 2026 · Synced Oct 16, 2026, 1:07 PM EDT
Completed Phase 1 Interventional Results available

A Study to Learn About the Study Medicine (Called Ritlecitinib) For the Potential Treatment of Severe Alopecia Areata (AA) In Children 6 To Less Than 12 Years of Age

NCT05650333
View directory record Official record
Conditions
Alopecia Areata
Interventions
Ritlecitinib 20 mg
Drug
Lead sponsor
Pfizer
Industry
Eligibility
6 Years to 11 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023
U.S. locations
9
States / cities
Encinitas, California • Coral Gables, Florida • Miami, Florida + 5 more
Source: ClinicalTrials.gov public record
Updated Oct 8, 2024 · Synced Oct 16, 2026, 1:07 PM EDT
Active, not recruiting Phase 3 Interventional

A Study to Learn About Medicine Called Ritlecitinib in Children Aged Between 6 to 12 Years With Severe Alopecia Areata

NCT07029711
View directory record Official record
Conditions
Severe Alopecia Areata
Interventions
Ritlecitinib higher dose, Ritlecitinib lower dose, Placebo
Drug
Lead sponsor
Pfizer
Industry
Eligibility
6 Years to 11 Years
Enrollment
208 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
31
States / cities
Irvine, California • Santa Ana, California • Aurora, Colorado + 22 more
Source: ClinicalTrials.gov public record
Updated Aug 26, 2026 · Synced Oct 16, 2026, 1:07 PM EDT
Terminated Phase 2 Interventional

Ritlecitinib in CTCL

NCT05879458
View directory record Official record
Conditions
CTCL, Mycosis Fungoides, Sezary Syndrome
Interventions
Ritlecitinib
Drug
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 18, 2025 · Synced Oct 16, 2026, 1:07 PM EDT
Active, not recruiting Phase 3 Interventional

A 52-Week Study to Learn About the Safety and Effects of Ritlecitinib in Participants With Nonsegmental Vitiligo

NCT06163326
View directory record Official record
Conditions
Vitiligo
Interventions
Ritlecitinib, Ritlecitinib 100 mg, Placebo
Drug
Lead sponsor
Pfizer
Industry
Eligibility
12 Years and older
Enrollment
394 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
22
States / cities
Encinitas, California • Huntington Beach, California • Los Angeles, California + 16 more
Source: ClinicalTrials.gov public record
Updated Sep 28, 2026 · Synced Oct 16, 2026, 1:07 PM EDT
Completed Phase 3 Interventional Results available

Long-Term PF-06651600 for the Treatment of Alopecia Areata

NCT04006457
View directory record Official record
Conditions
Alopecia Areata
Interventions
PF-06651600, Tetanus and diphtheria toxoids and acellular pertussis (Tdap) vaccine, Meningococcal (groups A, C, W-135 and Y [ACWY]) oligosaccharide diphtheria CRM197 conjugate vaccine
Drug · Biological
Lead sponsor
Pfizer
Industry
Eligibility
12 Years and older
Enrollment
1,057 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2026
U.S. locations
47
States / cities
Birmingham, Alabama • Beverly Hills, California • Irvine, California + 28 more
Source: ClinicalTrials.gov public record
Updated Apr 9, 2026 · Synced Oct 16, 2026, 1:07 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

A Target Occupancy Study With Ritlecitinib.

NCT05128058
View directory record Official record
Conditions
Healthy
Interventions
Ritlecitinib 50 mg, Ritlecitinib 200 mg
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 60 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Nov 13, 2023 · Synced Oct 16, 2026, 1:07 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

A Single Dose Study To Test Two Pediatric Forms Of Ritlecitinib Compared With Adult Ritlecitinib In Healthy Adults

NCT05040295
View directory record Official record
Conditions
Healthy Participants
Interventions
ritlecitinib
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 55 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Aug 21, 2023 · Synced Oct 16, 2026, 1:07 PM EDT
Completed Phase 2 Interventional

Double Blind, Placebo-controlled Trial to Establish Safety and Efficacy of Ritlecitinib in Celiac Disease Patients in Remission

NCT05636293
View directory record Official record
Conditions
Celiac Disease
Interventions
Ritlecitinib, Placebo, Gluten
Drug · Other
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 75 Years
Enrollment
62 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 15, 2026 · Synced Oct 16, 2026, 1:07 PM EDT
Completed No phase listed Observational

Utilization and Effectiveness of Ritlecitinib in a Real-World Population With Severe AA in the US

NCT07226531
View directory record Official record
Conditions
Alopecia Areata
Interventions
Ritlecitinib
Drug
Lead sponsor
Pfizer
Industry
Eligibility
12 Years and older
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 10, 2026 · Synced Oct 16, 2026, 1:07 PM EDT
Recruiting Phase 3 Interventional

A Study of 2 Doses of Ritlecitinib in People 12 Years of Age and Older With Alopecia Areata

NCT06873945
View directory record Official record
Conditions
Alopecia Areata
Interventions
Ritlecitinib 100 mg, Ritlecitinib 50 mg, Placebo - 100 mg, Placebo - 50 mg
Drug
Lead sponsor
Pfizer
Industry
Eligibility
12 Years and older
Enrollment
674 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
60
States / cities
Birmingham, Alabama • Hot Springs, Arkansas • Brea, California + 39 more
Source: ClinicalTrials.gov public record
Updated Sep 18, 2026 · Synced Oct 16, 2026, 1:07 PM EDT
Terminated Phase 2 Interventional Results available

PLACEBO-CONTROLLED SAFETY STUDY OF RITLECITINIB (PF-06651600) IN ADULTS WITH ALOPECIA AREATA

NCT04517864
View directory record Official record
Conditions
Alopecia Areata
Interventions
PF-06651600, Placebo
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 50 Years
Enrollment
71 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
23
States / cities
Huntington Beach, California • Irvine, California • Boca Raton, Florida + 17 more
Source: ClinicalTrials.gov public record
Updated Jul 11, 2025 · Synced Oct 16, 2026, 1:07 PM EDT
Active, not recruiting Phase 2 Interventional

Janus Kinase (JAK) Inhibitors to Preserve C-Peptide Production in New Onset Type 1 Diabetes (T1D)

NCT05743244
View directory record Official record
Conditions
Diabetes Mellitus, Type 1
Interventions
Abrocitinib 200 MG Oral Tablet, Ritlecitinib, Placebo
Drug
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
12 Years to 35 Years
Enrollment
78 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
23
States / cities
Orange, California • Palo Alto, California • San Francisco, California + 20 more
Source: ClinicalTrials.gov public record
Updated Sep 2, 2026 · Synced Oct 16, 2026, 1:07 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study to Learn About How Different Forms of the Study Medicine Called Ritlecitinib Pass the Intestines of Healthy Male Adults When Taken With or Without Food

NCT06369454
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Ritlecitinib
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older · Male only
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Aug 28, 2024 · Synced Oct 16, 2026, 1:07 PM EDT
Active, not recruiting Phase 3 Interventional

A 104-Week Study of Ritlecitinib Oral Capsules in Adults With Nonsegmental Vitiligo (Active and Stable) Tranquillo 2

NCT06072183
View directory record Official record
Conditions
Stable Nonsegmental Vitiligo, Active Nonsegmental Vitiligo
Interventions
Ritlecitinib, Placebo
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older
Enrollment
1,571 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
68
States / cities
Scottsdale, Arizona • Bryant, Arkansas • Fountain Valley, California + 47 more
Source: ClinicalTrials.gov public record
Updated Jun 24, 2026 · Synced Oct 16, 2026, 1:07 PM EDT
Recruiting Phase 2 Interventional

A Study to Learn About Ritlecitinib for the Potential Treatment of Chronic Spontaneous Urticaria in Adults.

NCT07219615
View directory record Official record
Conditions
Chronic Spontaneous Urticaria
Interventions
Ritlecitinib 50 mg, Ritlecitinib 100 mg, Placebo - 50 mg, Placebo - 100 mg
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
15
States / cities
Phoenix, Arizona • Little Rock, Arkansas • Bakersfield, California + 12 more
Source: ClinicalTrials.gov public record
Updated Jun 17, 2026 · Synced Oct 16, 2026, 1:07 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Estimation of the Effect of Multiple Dose Ritlecitinib (PF-06651600) on the Pharmacokinetics of a Single Dose of Caffeine in Healthy Participants

NCT04655040
View directory record Official record
Conditions
Healthy Participants
Interventions
Caffeine, Ritlecitinib
Drug · Other
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 55 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Mar 18, 2021 · Synced Oct 16, 2026, 1:07 PM EDT
Active, not recruiting No phase listed Observational

Characterization And Clinical Outcomes of AA Patients Treated With Ritlecitinib

NCT06531109
View directory record Official record
Conditions
Alopecia Areata
Interventions
Ritlecitinib
Drug
Lead sponsor
Pfizer
Industry
Eligibility
12 Years and older
Enrollment
450 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
28
States / cities
Birmingham, Alabama • Montgomery, Alabama • Fremont, California + 23 more
Source: ClinicalTrials.gov public record
Updated Oct 6, 2026 · Synced Oct 16, 2026, 1:07 PM EDT
Completed Phase 2Phase 3 Interventional Results available

PF-06651600 for the Treatment of Alopecia Areata

NCT03732807
View directory record Official record
Conditions
Alopecia Areata
Interventions
PF-06651600 Induction Dose, PF-06651600 Maintenance Dose #1, PF-06651600 Maintenance Dose #2, PF-06651600 Maintenance Dose #3, Placebo
Drug
Lead sponsor
Pfizer
Industry
Eligibility
12 Years and older
Enrollment
718 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
46
States / cities
Birmingham, Alabama • Beverly Hills, California • Irvine, California + 25 more
Source: ClinicalTrials.gov public record
Updated Feb 24, 2022 · Synced Oct 16, 2026, 1:07 PM EDT
Completed Phase 2 Interventional Results available

Ritlecitinib for Cicatricial Alopecia

NCT05549934
View directory record Official record
Conditions
Cicatricial Alopecia
Interventions
PF-06651600
Drug
Lead sponsor
Emma Guttman
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jul 15, 2026 · Synced Oct 16, 2026, 1:07 PM EDT
Active, not recruiting No phase listed Observational

Real-World Effectiveness of Ritlecitinib in Alopecia Areata Patients in the US: A Retrospective Analysis Using EHR and Claims Data

NCT07821216
View directory record Official record
Conditions
Alopecia Areata
Interventions
ritlecitinib
Drug
Lead sponsor
Pfizer
Industry
Eligibility
12 Years and older
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 16, 2026 · Synced Oct 16, 2026, 1:07 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Study to Evaluate the Effect of Multiple-Dose Ritlecitinib on the Pharmacokinetics (PK) of Tolbutamide

NCT05097716
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Ritlecitinib, Tolbutamide
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 65 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Oct 6, 2023 · Synced Oct 16, 2026, 1:07 PM EDT