INTERACTION BETWEEN NELFINAVIR AND TACROLIMUS AFTER ORTHOPTIC LIVER TRANSPLANTATION IN A PATIENT COINFECTED WITH HIV AND HEPATITIS C VIRUS (HCV)

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Abstract
A 49-year old male patient with severe hemophilia A, coinfected with HIV and HCV, who underwent orthoptic liver transplantation because of hepatitis C cirrhosis is presented. We describe a strong interaction between nelfinavir and tacrolimus postoperatively, that caused a reduction of the dose of tacrolimus by a factor 70 compared with normal, to achieve therapeutic blood concentrations and to avoid toxic side effects. We suggest that nelfinavir inhibits the metabolism of tacrolimus because both compounds are well-known substrates for the cytochrome P450 isoenzyme CYP 3A4. The nelfinavir serum concentrations were not affected by the institution of tacrolimus. Although the interaction dramatically changed the tacrolimus dose-concentration relationship, the situation was manageable by frequent monitoring of blood concentrations of tacrolimus.

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