Does the new hair loss drug work outside the lab?

This study aims to see how well the approved drug ritlecitinib works for people with severe alopecia areata (an autoimmune condition causing hair loss) in real-world settings. It will look back at the medical records of about 300 people in the U.S. who started the treatment to understand who uses it, how they use it, and what their hair regrowth and quality of life outcomes are. The goal is to learn how effective the treatment is in everyday doctor's offices, not just in controlled clinical trials.