Ristova 100mg & 500mg ( Rituximab ) Injection of Roche is a cancer medication that interferes with the growth of cancer cells and slows their growth and spread in the body. it is used in combination with other cancer medicines to treat non-Hodgkin's lymphoma or chronic lymphocytic leukemia. Ristova 100mg & 500mg Rituximab is also used in combination with another drug called methotrexate to treat symptoms of adult rheumatoid arthritis.