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PK/PD of Oxazolidinones

  • Ursula Theuretzbacher
Chapter

Abstract

Linezolid, the first available compound in the group of oxazolidinones, provides an effective alternative for the treatment of multidrug-resistant (MDR) Gram-positive bacteria. Linezolid’s iv and oral availability expands its usage to the outpatient setting. In vitro, animal, and clinical studies have defined an appropriate PK/PD index for linezolid, its correlation with the dosage regimen, and clinical outcome. Due to linezolid’s wide interpatient variability, some patients may have increased risk of inadequate drug exposure. As these patients are not readily identified, therapeutic drug monitoring may be necessary for critically ill patient populations as well as in long-term treatment. As alternative antibiotics are scarce, resistance development requires special attention. The selection of linezolid resistant mutants, especially with enterococci, and the emergence of mobile resistance determinants that affect a wide range of other ribosome-targeting antibiotics, will most likely spur the emergence and spread of linezolid resistance. Increasing drug exposure in an attempt to reduce selection pressure may not be feasible due to concentration dependent toxicity. On the other hand, combination therapy may positively impact exposure/resistance relationship, but our knowledge in this area remains incomplete. Employing PK/PD models to define dosing strategies and using antibiotic combinations to reduce selection pressure on linezolid-resistant mutants are major tasks yet to be undertaken.

Keywords

Linezolid Torezolid Oxazolidinones PK/PD Pharmacodynamics Pharmacokinetics Resistance 

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© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Center for Anti-Infective AgesViennaAustria

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