While intravenous silibinin has been used in the transplant setting in the treatment of Amanita phalloides-induced acute liver failure for over 20 years,61, 62 the mixture has only recently been evaluated in patients with hepatitis C undergoing liver transplantation. In the first case report, Legalon SIL was shown to prevent HCV reinfection of the graft.63 A second case of Legalon-SIL prevention of graft reinfection has also been reported.64 In this case report, cholestatic posttransplant hepatitis was also successfully treated by silibinin infusion. However, intravenous silibinin

was unable to prevent graft reinfection in a third patient infected with a genotype 2 virus.65 Finally, Eurich et al.66 reported four patients with graft reinfection with a significant decrease of HCV RNA (mean 2.8 log) after 10 Selleck CT99021 days of intravenous silibinin monotherapy. One patient cleared HCV RNA under silibinin monotherapy while a second patient cleared viremia following additional PEG/RBV therapy. Thus, intravenous silibinin appears to have clinical utility in the prevention of HCV reinfection following liver transplantation. Small Molecule Compound Library Moreover, a recent study indicates that silibinin is well tolerated and can reduce viral loads in patients waiting for liver transplantation.67 Fortunately, intravenous silibinin appears to be well tolerated. Patients tend

to experience a heat sensation and mild sweating during the first infusion. On the first infusion day, approximately half of the patients experience gastrointestinal Selleckchem Pomalidomide symptoms including nausea, abdominal pain, and diarrhea. The symptoms appear to be self-limiting and

decrease on subsequent treatment days. Following Legalon SIL treatment, significant increases of bilirubin have been reported, with normalization 2 weeks after dosing. The mechanism of the increase in bilirubin is unknown, but data point to the inhibition of anion transporters OATP B1 and OATP B3 by silibinin.68, 69 Finally, SIL has recently been shown to inhibit HCV and, to a lesser extent, HIV-1, in an HCV/HIV coinfected patient.70 Indeed, it has recently been found that SIL inhibits in vitro HIV infection of multiple cell types including peripheral blood mononuclear cells.71 In summary, intravenous silibinin could be an alternative for patients with HCV-associated endstage liver disease who have no further treatment options due to side effects of PegIFN/RBV therapy. Additional systematic studies that explore the length of silibinin treatment, the optimal dose, and the duration of post-silibinin PegIFN/RBV therapy should be performed. Legalon SIL retains many of the same in vitro antiviral properties of the parent silibinin including inhibiting HCV fusion, replication, and production of infectious progeny virus.55 Moreover, both Legalon SIL and silibinin inhibit in vitro NS5B polymerase activity.