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BAY 57-1293 is a potent and safe inhibitor of HSV helicase-primase with IC50 value of 12nM [1].

BAY 57-1293 displays anti-herpes activity through inhibiting the helicase-primase and affecting the viral DNA synthesis. In the in vitro viral replication assay, BAY 57-1293 shows inhibition against HSV-1 F, HSV-2 G and acyclovir-resistant HSV-1 F mutant with IC50 value of 20nM. In the plaque reduction assay and the conventional cytopathogenicity assay, BAY 57-1293 shows IC50 values of 0.01-0.02μM and 0.01-0.03μM, respectively. Besides that, BAY 57-1293 is active at an IC50 value of 10nM–30nM against all clinical isolates of HSV-1 and HSV-2. Furthermore, BAY 57-1293 is active in vivo. The oral administration of BAY 57-1293 shows 10-fold more potent than valacyclovir in a murine model of disseminated herpes infection. In a rat lethal challenge model, BAY 57-1293 exerts profound antiviral activity without toxic effects. [1, 2]

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