General Description
Tofacitinib, sold under the brand Xeljanz among others, is a medication used to treat rheumatoid arthritis, psoriatic arthritis, and ulcerative colitis.[1][2] Common side effects include diarrhea, headache, and high blood pressure.[1] Serious side effects may include infections and the development of cancer.[1] It is in the janus kinase (JAK) inhibitor class, discovered and developed by the National Institutes of Health and Pfizer.