MabThera injections are used to treat certain types of cancer, such as lymphoma and leukemia, as well as some immune diseases, such as rheumatoid arthritis. They contain an active ingredient that targets specific cells in the immune system called B cells, which helps reduce disease activity. MabThera is given intravenously under the supervision of a specialist doctor and in centers equipped to monitor the patient during the treatment period. Some side effects may occur, such as fever, fatigue, or low blood cells. Therefore, medical instructions must be adhered to to ensure the effectiveness of the treatment and avoid complications.