Inclusion Criteria:  Volunteers of both sexes over 18 years of age. Obtaining written informed consent. Ability and consent to participate in this research. Absence of symptoms of respiratory infection. A negative result of a PCR study for the presence of RNA SARS-CoV-2 according to biomaterial obtained by nasopharyngeal smear.  Exclusion Criteria:  Any other concomitant diseases or conditions, which, in the opinion of the research doctor, may distort research results, restrict the rights of a volunteer or put him/her at greater risk. Contraindications to the use of the investigated medicinal product. Individual intolerance to the ingredients included in the composition of the investigational medicinal product. Pregnancy or breastfeeding. Doubtful result of a PCR test for the presence of RNA SARS-CoV-2 in the biomaterial obtained by nasopharyngeal smear. Participation in a clinical trial using study therapy within 30 days prior to enrollment in this study. Disagreement to follow in the research reliable contraceptive measures (abstinence; or a combination of 2 different methods: for example, barrier and spermicides, or barrier and intrauterine device, or barrier and hormonal, etc.) - for participants with saved reproductive potential.