Abstract In this study total of 66 Pseudomonas aeruginosa strains that were isolated form pneumonic lung samples collected in the Kars Municipality Slaughterhouse. Using Kirby Bauer Disc Diffusion method, isolated strains were tested against tetracycline, ampicillin, gentamicin, amoxicillin/clavulanik acid, trimethoprim-sulfamethoxazole, vancomysin and chloramphenicol antibiotic discs. The results of the antibiogram showed that P. aeruginosa strains were resistant 100 to ampicillin, gentamicin, trimethoprim-sulfamethoxazole and chloramphenicol, 64 to vancomysin, 6 to amoxicillin/clavulanik acid, and 9 to tetracycline. Susceptibility to tetracycline, amoxicillin/clavulanik acid and vancomysin were determined to be 91, 94 and 36, respectively. In the light of the results, tetracycline and amoxicillin/clavulanik acid were suggested to in Pseudomonas aeruginosa infections.