Sepsis and septic shock are common cause of hospitalisation in intensive care unit. Acute kidney injury is an accompanying manifestation of sepsis/septic shock leading to worsening of morbidity and also mortality and requiring use of intermittent or continual renal replacement therapy. Life saving effect is attributed to early and effective antibiotic therapy. Therapeutic drug monitoring and do-sage adjustment is important for successful treatment. Despite therapeutic drug monitoring of both antibiotic agents vankomycin and gentamicin the treatment still rises many questions about the convenient use in septic patients due to their nephrotoxicity.