March 2023 in “SKIN The Journal of Cutaneous Medicine” This study observed that most patients with alopecia areata experienced sustained scalp hair regrowth after 48 weeks of ritlecitinib treatment, with safety consistent with prior findings.
1 citations
,
August 2024 in “British Journal of Dermatology” This study found that after 15 months of treatment with ritlecitinib, patients with alopecia areata and less than 95% initial hair loss experienced significant hair regrowth, though those with more extensive hair loss showed more variable improvement.
July 2023 in “SKIN The Journal of Cutaneous Medicine” This study found that some patients with alopecia areata who did not respond to ritlecitinib treatment by Week 24 achieved a positive response with continued therapy by Week 48, with tolerable side effects.
15 citations
,
January 2025 in “Journal of the European Academy of Dermatology and Venereology” Ritlecitinib is effective and safe for treating alopecia areata, promoting significant hair regrowth.
1 citations
,
September 2023 in “Journal of the American Academy of Dermatology” This study reported that most patients with alopecia areata who responded to ritlecitinib treatment by achieving a SALT score ≤20, SALT score ≤10, or improvements in eyebrow and eyelash assessments at Week 24 maintained their responses through Week 48.
November 2023 in “SKIN The Journal of Cutaneous Medicine” This study assessed ritlecitinib's effects on sustained hair regrowth in patients with alopecia areata who showed improvement at 24 weeks, confirming ongoing benefits through 48 weeks for scalp, eyebrow, and eyelash hair regrowth in this post hoc analysis.
April 2023 in “The journal of investigative dermatology/Journal of investigative dermatology” This study found that treatment with ritlecitinib led to significant scalp hair regrowth in patients with alopecia areata at Weeks 24 and 48, with higher response rates observed in those receiving 50 mg compared to 30 mg doses.
1 citations
,
September 2023 in “Journal of the American Academy of Dermatology” In this study, patients with alopecia areata who didn't initially respond to ritlecitinib at Week 24 showed improved response rates by Week 48, with up to 34% achieving better hair regrowth outcomes.
1 citations
,
July 2025 in “SKIN The Journal of Cutaneous Medicine” In this study, ritlecitinib 50-mg showed clinically meaningful efficacy, with improvements in the Severity of Alopecia Tool score observed in patients with alopecia areata over a 3-year period, demonstrating long-term benefit in both clinician- and patient-reported outcomes.
2 citations
,
June 2024 in “Dermatology” This study found that patients receiving active ritlecitinib doses reported greater satisfaction with hair growth compared to placebo, with high agreement observed between clinician evaluations of scalp hair improvement and patient satisfaction through week 48.
July 2025 in “Journal of the European Academy of Dermatology and Venereology” This study reports no new findings but provides corrected figures for the long-term safety and efficacy of ritlecitinib in treating alopecia areata from the ALLEGRO-LT phase 3 study.
September 2023 in “Dermatology and therapy” In this phase 2b/3 trial, ritlecitinib showed effectiveness in treating alopecia areata patients with varying hair loss profiles, significantly improving patient-reported outcomes for hair regrowth and satisfaction compared to placebo, regardless of the hair loss type and extent at baseline.
March 2025 in “Journal of Investigative Dermatology” 3 citations
,
July 2025 in “Clinical and Experimental Dermatology” This study reported that patients with alopecia areata treated with ritlecitinib in a real-life setting had a higher rate of positive response on the Severity of Alopecia Tool score compared to those in the ALLEGRO trial.
May 2025 in “Immunotherapy” This study observed that patients with alopecia areata taking ritlecitinib reported higher satisfaction with hair growth after 24 and 48 weeks compared to those taking a placebo, aligning with improvements in hair growth noted by doctors.
October 2023 in “Naunyn-Schmiedeberg's Archives of Pharmacology” Custom software found that common allergy drugs might have new uses for various conditions and could improve survival in some cancers.
23 citations
,
October 2024 in “British Journal of Dermatology” In this study, ritlecitinib showed sustained effectiveness and a favorable safety profile in treating alopecia areata in patients aged 12 and older over 24 months, with improvements observed in hair and eyebrow regrowth and patient satisfaction.
July 2025 in “SKIN The Journal of Cutaneous Medicine” This study reported that ritlecitinib was generally well tolerated over 72 months in patients aged 12 and older with alopecia areata, with adverse events like headache and nasopharyngitis observed, and safety outcomes consistent with previous studies.
3 citations
,
February 2025 in “Journal of Dermatological Treatment” This study found a positive association between clinically meaningful scalp hair regrowth and improvements in patient-reported outcomes, such as satisfaction and reduced psychosocial burden.
6 citations
,
March 2024 in “SKIN The Journal of Cutaneous Medicine” In this ongoing phase 3 study, ritlecitinib demonstrated sustained efficacy up to 24 months in patients aged 12 or older with alopecia areata, showing increased response rates with or without an initial loading dose and supporting its long-term use.
1 citations
,
November 2025 in “American Journal of Clinical Dermatology” This study reports that long-term treatment with ritlecitinib is generally well tolerated for up to approximately five years in patients aged 12 and older with alopecia areata, with the safety profile aligning with previous data from the ALLEGRO clinical trials.
November 2025 in “SKIN The Journal of Cutaneous Medicine” This study evaluated the long-term safety of ritlecitinib in adolescents with alopecia areata and found it to be well-tolerated without new safety concerns over approximately five years, with common adverse events including positive SARS-CoV-2 tests, acne, headache, and nasopharyngitis.
November 2025 in “SKIN The Journal of Cutaneous Medicine” In this study, nearly one-third of patients with severe alopecia areata treated with ritlecitinib achieved complete scalp hair regrowth at least once over three years, and most maintained regrowth or stayed at low hair loss levels subsequently.
4 citations
,
March 2025 in “The Journal of Dermatology” This study found that in Asian patients aged 12 and older with alopecia areata and significant hair loss, ritlecitinib showed clinical efficacy in improving hair regrowth and eyebrow and eyelash scores over 48 weeks, with an acceptable safety profile observed throughout.
4 citations
,
October 2024 in “American Journal of Clinical Dermatology” This study found that ritlecitinib improved patient-reported outcomes related to hair growth in individuals with alopecia areata, with some experiencing clinically meaningful hair regrowth, although changes in emotional symptoms and activity limitations were minimal and similar across treatment groups.
4 citations
,
November 2023 in “SKIN The Journal of Cutaneous Medicine” In this study, ritlecitinib, an oral JAK3/TEC inhibitor, was evaluated for safety in patients aged 12 and older with alopecia areata across four clinical trials up to 36 months, showing a safety profile with reported adverse events and lab abnormalities summarized per dosing groups.
February 2026 in “The Journal of Dermatology” This study reports that ritlecitinib 50 mg, with or without an initial loading dose, demonstrated meaningful and sustained efficacy up to 24 months in the Asian subpopulation with severe alopecia areata, showing significant scalp, eyebrow, and eyelash hair regrowth, along with an acceptable safety profile.
1 citations
,
October 2025 in “International Journal of Dermatology” In this study, participants receiving a 50-mg maintenance dose of ritlecitinib reported greater improvements in emotional and activity limitations due to hair loss by Week 48 compared to those on a 10-mg dose.
48 citations
,
July 2023 in “Pediatric Dermatology” This study found that among adolescents with alopecia areata and significant hair loss, treatment with ritlecitinib resulted in greater hair regrowth and self-reported improvement compared to placebo over 48 weeks, with common side effects including headache, acne, and nasopharyngitis.
November 2024 in “SKIN The Journal of Cutaneous Medicine” This study found that daily treatment with ritlecitinib 50 mg over 24 months reduced the number of patients in the highest categories of scalp hair loss, with improvements seen in patient responses over time.