Antibiotic resistance in Pseudomonas aeruginosa is a major barrier to successful treatment of infection. Additional and novel measures to control this pathogen are needed, along with contemporary information about antibiotic resistances that are present in isolates from different environments. In the present study 72 samples from blood, 43 from sputum, and 19 were obtained from tracheal aspirates patients suffering from chronic and acute lung infections admitted to a local hospital in Lahore. Susceptibility of 134 isolates of P. aeruginosa was tested against selected antibiotics (meropenem, imipenem, piperacillin, amoxicillin, amikacin, gentamicin, tobramycin, kanamycin, clarithromycin, clarithromycin, cefepime, cefixime, levofloxacin, and ciprofloxacin), Lactobacillus strains and metal nanoparticles (copper, ferric and zinc). P. aeruginosa isolates showed in vitro resistance against 11 of 14 antibodies tested. The isolates were highly susceptible to meropenem, piperacillin, and amoxicillin. It was also observed that the growth of these resistant P. aeruginosa strains was significantly inhibited in the presence of Lactobacilli spp. and nanoparticles of silver, zinc and ferric oxide at a concentration of 12, 200 and 1µg/ml, respectively. This study may help in the development of chemotherapeutic methods against multidrug resistant bacterial pathogens in chronic and acute lung infections. It provides a practical approach towards the use of nanoparticles to enhance antimicrobial activity against these pathogens.