Efficacy and Safety of Ritlecitinib, an Oral JAK3/TEC Family Kinase Inhibitor, in Adolescent and Adult Patients with Alopecia Totalis and Alopecia Universalis

Ritlecitinib and PP405 show promise for hair regrowth. Diagnosing the cause of hair loss is crucial before treatment.

An arthritis drug, baricitinib, is discussed as a potential treatment for autoimmune alopecia, not androgenetic alopecia. Ritlecitinib is also mentioned as a possible treatment for scarring alopecia.

Promising hair loss treatments in clinical trials include Pyrilutamide, GT20029, CB-03-01, and PP405, with potential market releases between 2027 and 2029. Hair cloning remains experimental and expensive, while existing treatments like finasteride, minoxidil, and microneedling continue to be used.

Minoxidil and finasteride are the only FDA-approved treatments for androgenetic alopecia, while newer treatments like clascoterone, PP405, NV-623/624, AMP-303, and RU58841 are still experimental with varying levels of evidence. Clascoterone shows the most promise due to strong human data, while AMP-303 has notable early human trial results; RU58841 lacks human data and remains experimental.

PP405 is the most promising future treatment for hair loss, aiming to reactivate dormant hair follicles. Clascoterone 5% is the most promising near-term drug, while current strategies include using finasteride or dutasteride to stabilize hair loss and minoxidil to stimulate growth.