Pritelivir (mesylate)

Pritelivir mesylate (BAY 57-1293 mesylate), an inhibitor of the viral helicase-primase complex, exhibits antiviral activity in vitro and in animal models of herpes simplex virus (HSV) infection. Pritelivir mesylate is active against herpes simplex virus types 1 and 2 (HSV-1 and HSV-2) with the IC₅₀ of 0.02 μM against HSV1-2^[1]. IC50 & Target: IC50: 0.02 μM (HSV1-2)^[1] In Vivo: Pritelivir is the first in a class of antiviral agents that inhibit HSV replication by targeting the viral helicase–primase enzyme complex^[2].
Pritelivir (0.03-45 mg/kg) significantly increases survival. Pritelivir (0.3-30 mg/kg) reduces mortality against HSV-1, E-377. Pritelivir has potent and resistance-breaking antiviral efficacy with potential for the treatment of potentially life-threatening HSV type 1 and 2 infections, including herpes simplex encephalitis^[3].
Combination therapies of Pritelivir at 0.1 or 0.3 mg/kg/dose with Acyclovir (10 mg/kg/dose) are protective when compared to the vehicle treated group against HSV-2, strain MS^[3].