Bacteriophage are used in clinical practice along with antibiotics. It is known that in many cases phage drugs are superior to other antibacterial drugs in their activity against antibiotic-resistant pathogens. Bacteriophages do not cause toxic or allergic side effects and have no contraindications.The use of bacteriophage preparations stimulates the activation of adaptive and innate immune factors, so phage therapy is particularly effective in the treatment of chronic inflammatory diseases against the background of immunosuppressive States. Bacteriophages do not interfere with the implementation of the therapeutic effect of other drugs (antibiotics, probiotics, synbiotics) and are not sensitive to their effects. The paper evaluates the sensitivity of different types of staphylococci and streptococci to specific bacteriophages, as well as to sextaphage - polyvalent piobacteriophage. In the course of research, it was found that bacterial cultures of Staphylococcus aureus showed a fairly high sensitivity to sextaphage, to which 83,3% (10 strains) of the total number of studied strains of this species were susceptible. Sensitivity to bacteriophages in Staphylococcus epidermidis strains was low. Bacterial strains of Streptococcus pyogenes showed greater susceptibility to streptococcal phage than to sextaphage. 87,5% of the strains were susceptible to streptococcal bacteriophage. Bacterial cultures of Streptococcus salivarius showed moderate susceptibility to bacteriophages.