Abstract: The group of inventions is related to medicine, namely infectious diseases, as well as pharmacology, the pharmaceutical industry and biotechnology and provides pegylated interferon lambda having antiviral activity against hepatotropic viruses, wherein said agent has oral bioavailability at least 10%, which ensures high concentration of the agent in the liver, bypassing the systemic circulation, reduces systemic side effects and increases the compliance with therapy, and wherein the method for preparation of the agent comprises irradiating a solution of polyethylene glycol with a molecular weight of from about 400 to about 5,000 Da with ionizing radiation in a dose of 1 to 5 Mrad, mixing the resulting solution with an interferon lambda solution, freezing and cooling of the resulting mixture to a temperature of ?10° C. or below, and the irradiating of the frozen and cooled mixture with ionizing radiation in a dose of 0.1 to 0.5 Mrad.

Abstract: A pharmaceutical composition having thrombolytic, anti-inflammatory and cytoprotective properties is described. The composition contains active proteases attached to a gel or to a mixture of a gel with a water-soluble polymer, said attachment being achieved with the help of radiation, preferably with the help of gamma-radiation or a flow of accelerated electrons. As the proteases the composition contains proteases which are stable at a temperature of up to 70° C., preferably at 30-40° C., for instance such as subtilysine, trypsin, chemotrypsin, papain or streptokinase. The gel is preferably polyethylene glycol gel, dextran gel, or polyglycane gel, and the water-soluble polymer is polyethylene glycol, polyvinyl alcohol, dextran or polyglycane. The method of preparing said composition and its use are also disclosed. The composition has a broad range of application, and can be used in cardiology, nephrology, surgery, rheumatology, gynecology and gastroenterology.