The aim of this study was to examine in vitro the antioxidant and antiviral activity of echinochrome A and echinochrome-based antioxidant composition against tick-borne encephalitis virus (TBEV) and herpes simplex virus type 1 (HSV-1). Materials and methods. TBEV (Dal'negorsk strain, Far Eastern subtype) grown in PK cells, and HSV-1 (VR3 strain) in Vero cells. The antioxidant activity of the compounds was determined using the linetol peroxide oxidation model. The cytotoxicity and antiviral

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... ity of the compounds were assessed by cell viability (PK- and Vero cells) and by cytopathic effect inhibition of viruses (TBEV and HSV-1) using the MTT test. Results. The antioxidant composition, which is a mixture of echinochrome A, ascorbic acid and α-tocopherol (5: 5: 1), showed a higher antioxidant and antiviral efficacy than echinochrome A. The antiviral mechanisms on of echinochrome A and antioxidant composition are caused by direct inactivation of TBEV and HSV-1 viruses and inhibition of virus penetration into cells. Conclusion. The results obtained allow considering the echinochrome A and the composition of antioxidants on its basis as the promising agents of a broad-spectrum antiviral activity.