Klebsiella pneumoniae strains are opportunistic microorganisms that colonize the human gastrointestinal tract and can spread to various tissues and systems of the body, causing a wide range of severe diseases, including pneumonia. The problem of Klebsiella infections has become topical recently due to the spread of hypervirulent and antibiotic-resistant strains in the K. pneumoniae population, which indicated the need to develop modern antimicrobial agents. One of the approaches to combating pathogens of pneumonia is a combination of lysozyme with antimicrobial drugs, which was successfully tested in children’s hospitals in Orenburg. A natural antioxidant and antioxidant, carnosine, is considered as a new candidate in the fight against Klebsiella. A synergistic combination of carnosine with antimicrobial agents against Klebsiella pneumoniae was established in vitro. The results obtained allowed us to expand the range of effective and safe means of combating pathogens of Klebsiella infections.