Herbal Medicines for Hepatitis C Virus Infection: The Exploratory Journey from Bench to Bedside Still Has a Long Way to Go

Abstract

Hepatitis C virus (HCV) infects at least 150 million people chronically worldwide. It is a major risk factor for cirrhosis, hepatocellular carcinoma, and death. Direct-acting antiviral therapy is very efficacious in treating HCV infection but it is inaccessible and unavailable in some developing countries. Therefore, searching for more effective and easily accessible regimens remains an urgent need. The aim of this article is to review the anti-HCV effects of herbal medicines from experimental to clinical evidence, and discuss current issues, hurdles and future perspectives for their application from bench to bedside. Numerous in vitro studies have indicated that many herbs work effectively in exerting anti-HCV activities. Yet, only a few animal experiments have been conducted that demonstrate the anti-HCV effects of these medicines; in addition, these results do not show an ability to eliminate the virus completely from the infected animals. Thus far, clinical trials have produced inconclusive anti-HCV results in terms of efficacy and safety, presumably due to the lack of the quality of methodologies used in the trials. In conclusion, despite apparent anti-HCV activities in vitro, clinical efficacy and safety of herbal medicines for the treatment of HCV infection have not been revealed convincingly. More animal studies using ideal models and more well-designed clinical trials with a larger sample sizes and longer treatment periods, taking the body habitus into consideration, are required to further assess the efficacy and safety of herbal medicines for HCV infection.