<unk>  is an immunosuppressant that is FDA approved for the prophylaxis of organ rejection in patients receiving a kidney transplant.. There is a Black Box Warning for this drug as shown here.  Common adverse reactions include anemia, leukopenia, constipation, nausea, diarrhea, vomiting, dyspepsia, urinary tract infection, CMV infection, insomnia, and postoperative pain.
Mycophenolate sodium
Lenalidomide
Rituximab
Sirolimus
Cyclosporine 
Vincristine sulfate
Cyclophosphamide
Dihydroergocristine