Rituximab specific use of dosage and duration of treatment varies according to different diseases, divided into 1~4 weeks to use 1 time ranging, the specific how often to play need to be based on the condition. 1. Rituximab belongs to biological agents, is a monoclonal antibody targeting CD20. 2. It is generally used in non-Hodgkin’s lymphoma, chronic lymphocytic leukemia, and also in other non-tumor diseases such as systemic lupus erythematosus and vasculitis. 3. For example, in lymphoma chemotherapy, rituximab has a chemotherapy regimen that is used once at intervals of 14 days, 21 days, 28 days, etc.; in refractory systemic lupus erythematosus and refractory thrombocytopenic purpura, rituximab can be used once a week. Adverse reactions such as leukopenia, anemia, and infections can occur with the use of rituximab; rituximab is contraindicated in patients who are allergic to any component of the drug and to murine proteins. Therefore, for rituximab how often to play, need to be based on the disease itself, the condition of the overall assessment of the decision, you need to go to the regular hospital relevant specialties for treatment.