Summary
The recent increase in the use of vancomycin has led to renewed interest in its pharmacokinetics, and, in particular, the importance of monitoring serum drug concentrations. A review of the literature and evaluation of pharmacokinetic data from Vancouver Hospital and Health Sciences Centre demonstrated that vancomycin meets the criteria necessary for serum drug concentration monitoring. These include the availability of a sensitive and specific assay, substantial interpatient and intrapatient variability in drug disposition, and evidence suggesting a correlation between vancomycin serum concentration and both efficacy and toxicity. A review of vancomycin disposition data for 371 consecutive treatment courses at this hospital revealed significant interpatient variability in drug clearance and volume of distribution. Accordingly, it would be difficult to accurately predict the change in serum concentration resulting from a given vancomycin dose. There appears to be less intrapatient variability in volume of distribution; however, serum elimination half-life tends to increase during treatment, necessitating an alteration in dose interval. Although convenient, physiological parameters to monitor serum creatinine concentration and bodyweight are not accurate predictors of drug clearance and volume of distribution. Serum concentration monitoring is also necessary to ensure that vancomycin concentrations are in excess of the minimum inhibitory concentration of the organism at all times during treatment. Although a causal relationship between vancomycin and toxicity has been difficult to prove, there is some evidence in the literature to support a relationship between high troughs and nephrotoxicity. In view of the available evidence, we do not believe that serum concentration monitoring should be totally abandoned. We have created empiric dosage guidelines and a decision-making algorithm for serum drug concentration monitoring that have streamlined the process of drug prescribing and monitoring at this institution.
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Marra, F., Cairns, B. & Jewesson, P. Vancomycin Serum Concentration Monitoring. Clinical Drug Investigation 12, 105–118 (1996). https://doi.org/10.2165/00044011-199612020-00006
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DOI: https://doi.org/10.2165/00044011-199612020-00006