Used in the treatment of chronic inflammatory diseases, particularly rheumatoid arthritis. It functions as a selective kinase inhibitor, modulating immune response by suppressing the activity of key signaling proteins involved in inflammation. Its structure allows targeted interaction with intracellular enzymes, reducing cytokine production and preventing joint damage. Due to its chiral specificity, the (R)-enantiomer shows higher potency and lower off-target effects compared to the racemic mixture. Employed in oral dosage forms, it offers improved bioavailability and sustained therapeutic action with once-daily administration.