inhibits Janus kinase enzymes to treat autoimmune conditions
Tofacitinib, also known by the brand name Xeljanz, is a medication that inhibits Janus kinase (JAK) enzymes, which play a role in the inflammatory process. It is used to treat autoimmune conditions such as rheumatoid arthritis, psoriatic arthritis, and ulcerative colitis, and has also shown promise in treating alopecia areata, a condition that causes hair loss.