Relevance. According to modern concepts, virulent representatives of periodontal pathogenic bacteria are actively involved in the development of both periodontal pathology and various forms of odontogenic infection. The species diversity of these pathogens determines the need for a combined approach when choosing antimicrobial drugs.The aim of the work is to provide a microbiological substantiation of the use of a combined dosage form of ciprofloxacin and tinidazole for the treatment of

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... tal and odontogenic infections based on the determination of the spectrum of action and the characteristics of the activity of the components.Materials and methods. Determination of the sensitivity of various strains of periodontal and odontogenic infection pathogens (P. intermedia, S. constellatus; S. sanguis, K. pneumoniae, S. aureus – MRSA) was carried out by the method of automated cultivation of strains with different concentrations of the tested drugs – ciprofloxacin and tinidazole.Results. Differences in the activity of the components of the combined preparation ciprofloxacin and tinidazole were found in terms of the sensitivity of strains of aerobic and anaerobic pathogens to them. Aerobic strains, including MRSA, were inhibited by ciprofloxacin in a low concentration range (6.25 μg / ml), but for some anaerobic strains the activity of ciprofloxacin was borderline (12.5 μg / ml). This confirmed the need to include tinidazole in the composition of the complex preparation.Conclusion. The combination of ciprofloxacin and tinidazole provides coverage of the full spectrum of periodontal and odontogenic infections and can be used as the agent of choice in the antimicrobial chemotherapy algorithm for head and neck infections.