Xeljanz (tofacitinib) is an oral medication that belongs to a class of drugs known as Janus kinase (JAK) inhibitors. It is prescribed to treat autoimmune conditions such as rheumatoid arthritis, psoriatic arthritis, and ulcerative colitis by targeting specific pathways that cause inflammation in the body. Xeljanz helps reduce pain, swelling, and damage to the joints or intestines. Available in tablet form, it is taken as directed by a healthcare provider, with the dosage adjusted according to the patient’s specific needs and response to therapy.