Used to treat moderate to severe rheumatoid arthritis in adults who have not responded well to other treatments. It helps reduce joint pain, swelling, and stiffness by targeting specific pathways involved in the immune response. Also prescribed for certain types of psoriatic arthritis, atopic dermatitis, and ulcerative colitis. Works by selectively inhibiting Janus kinase (JAK) enzymes, which play a role in inflammation. Taken orally, it offers a targeted approach for patients who need an alternative to biologic therapies.