The invention relates to the chemical and pharmaceutical industry. A method for producing a stabilized pharmaceutical composition in the form of an aqueous solution comprising active ingredients which include succinic acid, inosine, nicotinamide and riboflavin mononucleotide sodium salt, wherein a stabilizing agent is further introduced into the composition as one or more pharmaceutically acceptable ingredients selected from the group consisting of sodium hydroxide, tris-(oxymethyl)aminomethane (TRIS), ethanolamine, diethanolamine, sodium carbonate and meglumine to obtain a stable aqueous solution having a pH value in the range of 6.0 to 8.0; the method further comprises a sterilizing filtration of the resulting dissolved composition, and an additional thermal sterilization at temperatures from 100癈 and an exposure time of 8 minutes to 116癈 and an exposure time of 2 minutes.