Administered as an intravenous infusion, Rituximab 100mg injection is given with the help of doctors and nurses as immunotherapy (targeted cancer treatment) to treat lymphoma and leukaemia. Autoimmune disorders like rheumatoid arthritis that contribute to inflammation and joint damage is also treated with Rituximab 100mg injection. Common side effects like tiredness, body aches, nausea, diarrhea, swelling may be seen in few patients. Infusion related reactions like itching, weakness, sudden cough, hives(red itchy bumps) are also some of the common symptoms. Do not come in contact with someone who recently received a live vaccine and avoid getting a live vaccine. Follow your healthcare provider instructions very carefully to avoid any serious complications. Immediately visit doctor if the symptoms persists for a long time.