{Reference Type}: Case Reports {Title}: A rare adverse effect in inebilizumab therapy for neuromyelitis optica spectrum disorder: a case report. {Author}: Chen X;Shi Z;Wang R;Zhou H; {Journal}: Ther Adv Neurol Disord {Volume}: 17 {Issue}: 0 {Year}: 2024 {Factor}: 6.43 {DOI}: 10.1177/17562864241258787 {Abstract}: Inebilizumab is one of the monoclonal antibodies approved as maintenance therapy for aquaporin-4 immunoglobulin G-seropositive neuromyelitis optica spectrum disorder (NMOSD). It is a humanized monoclonal antibody targeting cluster of differentiation 19 (CD19). Common adverse reactions include urinary tract infections, nasopharyngitis, arthralgia, infusion reactions, headaches and a decrease in immunoglobulin levels. Here, we present a case of an NMOSD patient who experienced transient hyperCKaemia after the use of inebilizumab. The adverse reactions of this very rare monoclonal antibody drug improved after discontinuation.