Tofacitinib is a medication classified as a Janus kinase (JAK) inhibitor. It works by inhibiting the activity of specific enzymes called Janus kinases, which play a role in the immune system's response. By modulating these enzymes, tofacitinib helps to regulate the immune response, making it useful in the treatment of certain autoimmune diseases. Tofacitinib 11 mg is a extended release tablet.