Laennec is a pharmaceutical, natural polypeptide injectable preparation - human placenta hydrolyzate with a unique composition, which includes low molecular weight peptides, micro and macro elements, vitamins. The drug has immunomodulatory, hepatoprotective, anti-inflammatory, regenerative/reparative, antifibrotic, antioxidant, neurotrophic, lipotropic properties. Laennec contains 14 peptides with a targeted antiviral effect, which is realized at all stages of the DNA/RNA virus life cycle, including the fusion of the viral capsid with the cell plasma membrane, virus replication, virion maturation, and budding of viral particles from the cell membrane. The systemic action of the drug is based on the composition of its active components. The drug contains low molecular weight regulatory peptides, structural and plastic components, cytokines, essential microelements. A cocktail of biogenic metabolism activators induce the regeneration and repair of tissues and organs at the cellular and molecular level, affecting the rate of cell division (including tissue-specific stem cells), which replace defective cells with new highly specialized cells, and not with connective tissue, which leads to the improvement of the parenchyma organs of the whole body.