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Baricitinib, formerly named LY3009104 or INCB028050, is a new selective orally bioavailable inhibitor of tyrosine-protein kinase JAK1 or JAK2. Also, it is an ATP competitive kinase inhibitor. In vitro, it is able to inhibit JAK1 and JAK2 in a low nanomolar range with IC50 values of 5.9 and 5.7 nM, respectively, while it demonstrates low inhibitory activity for JAK3 and moderate activity for TYK2. Baricitinib inhibits intracellular signaling of multiple proinflammatory cytokines including IL-6 and IL-23 at concentrations <50 nM. It should also be recognized that JAK signaling is central to a number of fundamental processes, including the generation of RBCs

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