Mycophenolate is an immunosuppressive medication primarily used to prevent organ rejection in transplant patients and to treat autoimmune diseases, such as lupus and rheumatoid Arthritis. It works by inhibiting the proliferation of lymphocytes, which are crucial for the immune response. The drug is often prescribed in the form of mycophenolate mofetil (MMF) or mycophenolate sodium (EC-MPS). Common side effects include gastrointestinal issues, increased risk of infections, and potential effects on blood cell counts.