What are the differences between immunosuppressive drugs and rituxan (rituximab)?

Rituximab: Rituximab is one class of immunosuppresant therapy. It is an chimeric (composed of human and animal) monoclonal antibody directed against a surface marker (cd20) on your b-cells. Your b-cells naturally produce your own body's antibodies to help fight infections. There are other types of immunosuppresants which have different targets than b-cells, such as t-cells, and cytokines such as tnf-alpha.

Rituximab: All of these are considered immunosuppressive agents since they act by calming down the bodies instigating factor, the immune system which is already acting in an autoimmune fashion.