Rituximab is used to treat certain types of cancer (such as non-Hodgkin lymphoma, chronic lymphocytic leukemia). It works by slowing or stopping the growth of cancer cells.
Rituximab is used to treat rheumatoid arthritis and can decrease joint pain and swelling. It is also used to treat certain types of blood vessel disease (such as Wegener's granulomatosis, microscopic polyangiitis) and can decrease the swelling of the blood vessels. Rituximab is also used to treat a certain skin condition (pemphigus vulgaris). It helps to reduce the number of skin lesions.