<unk>  is an antibiotic, anti-neoplastic agent that is FDA approved for the prophylaxis of organ rejection in patients receiving allogeneic renal, cardiac or hepatic transplants. There is a Black Box Warning for this drug as shown here.  Common adverse reactions include diarrhea, leukopenia, sepsis, vomiting, opportunistic infections.
Mycophenolate
Rituximab
Cyclophosphamide
Cyclosporine 
Lenalidomide
Dihydroergocristine
Sirolimus
Tacrolimus 