Baricitinib is a once daily, oral selective Janus kinase (JAK) inhibitor for the treatment of adult patients with moderately to severely active rheumatoid arthritis who have had an inadequate response to 1 or more tumor necrosis factor (TNF) antagonist therapies. JAK inhibitors are small molecules that interrupt intracellular signaling pathways in the inflammatory cycle by inhibiting the activity of 1 or more of the JAK enzymes (JAK1, JAK2, JAK3, and tyrosine kinase 2). Because of their small size, they can be formulated for oral administration.
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