When you can't authorize a transaction over the Internet (perhaps because you can't access the Internet, or you need an approval for a high dollar amount), you must call the cardholder's bank to get a voice authorization code. To submit a voice authorization code for a credit card transaction:
Tacrolimus (also FK-506 or fujimycin, trade names Prograf, Advagraf, Protopic) is an immunosuppressive drug used mainly after allogeneic organ transplant to lower the risk of organ rejection.
USES: Tacrolimus is used with other medications to prevent rejection of a kidney, heart, or liver transplant. This medication belongs to a class of drugs known as immunosuppressants.