FIELD : medicine; pharmaceuticals.SUBSTANCE : invention relates to pharmaceutical industry, in particular, to the use of ginsenoside rg3 for the preparation of a medicament for the treatment of an infectious disease caused by HCMV. Use of the ginsenoside rg3, selected from 20(R)-ginsenoside rg3 or 20(R)-ginsenoside rg3 8-N-hydroxybutyrate, is proposed for the preparation of a medicament for the treatment of an infectious disease caused by HCMV.EFFECT : above-described remedy is effective for treating an infectious disease caused by HCMV.3 cl, 40 tbl