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Olokizumab (OKZ) sold under the name Artlegia, is an immunosuppressive drug, used for the treatment of rheumatoid arthritis and COVID-19. It is a humanized monoclonal antibody against the interleukin-6 (IL-6). IL-6 is a cytokine that plays an important role in immune response and is implicated in the pathogenesis of many diseases. Olokizumab is the first interleukin-6 (IL-6) inhibitor approved for treatment of rheumatoid arthritis which blocks directly cytokine instead of its receptor. Olokizumab specifically binds to IL-6 at Site 3, blocking IL-6 ability to form hexameric complex. Olokizumab was developed by R-Pharm group, and was launched in 2020. The drug is registered in Russia and Azerbaijan, Kazakhstan, Kyrgyzstan and the Republic of Belarus. Included in the clinical guidelines “Rheumatoid Arthritis” and the list of Vital and Essential Drugs.