Immunosuppressant risk categories according to US Food and Drug Administration [18].
Category
Drug
Animal/human studies
A
Paracetamol
No risk in human studies
B
Corticosteroids (Prednisolone)
No risk in animal studies or Risk in animal studies but that risk not demonstrated in human studies
Tacrolimus (Prograft)
C
Rapamycin
Fetal risk demonstrated in animal studies but no adequate and well-controlled studies in humans. Drugs can be used if potential benefits outweigh risks
Cyclosporine A (Neoral, Sandimmune, Gengraf)
D
Mycophenolate Mofetil (CellCept, Myfortic)
Fetal risk demonstrated in human studies. In exceptional circumstances, drugs can be used if potential benefits outweigh risks