Tazobactam/piperacillin (TAZ/PIPC) is widely used in the treatment of infectious disease. In this study, three hundred and sixty-three patients who were treated with the recommended dose of TAZ/PIPC were investigated for the proportion of time above the minimum inhibitory concentration (%TAM) and the frequency of renal and liver dysfunction. Of the whole patient population, 5.23%, exhibited increased creatinine levels, 9.37% and 8.82% exhibited increased aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels, respectively. The patients who exhibited high serum creatinine (SCr) levels before administration, exhibited significant increases of AST (p=0.0121). The patients who exhibited low albumin levels before administration, exhibited significant decreases in renal function (p=0.0041). In the case of a breakpoint (BP) of 64 μg/mL, the arrival probabilities of %TAM of 30% and 50% were 99.4% and 76.9%, respectively. We suggested that the dose of TAZ/PIPC should be adjusted according to the interview form finding and a %TAM>50% (maximal bactericidal action).
Keywords: breakpoint; liver dysfunction; renal dysfunction; tazobactam/piperacillin; time above minimum inhibitory concentration.