Description:
IC50 Value: 8mM (NS4B) [1]
Clemizole is an H1 histamine receptor antagonist. Recently, researchers have identified that clemizole hydrochloride can inhibit NS4B's RNA binding and hepatitis C virus (HCV) replication.
in vitro: Although significant, clemizole's antiviral effect is moderate (50% effective concentration of 8 microM against an HCV genotype 2a clone). Combinations of clemizole with either interferon, ribavirin, or the nucleoside (NM283) and nonnucleoside (HCV796) HCV polymerase inhibitors were additive [1]. The differences in the rodent and human pathways for clemizole metabolism were of importance, because the predominant human metabolite was found to have synergistic anti-HCV activity [2].
in vivo: Clemizole and reserpine treatment did not produce any modification of the dose-response curve to histamine [3].
Clinical trial: Safety and Tolerability Study of Clemizole Hydrochloride to Treat Hepatitis C in Subject