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Research Article

Pharmacokinetics and bactericidal rates of daptomycin and vancomycin in intravenous drug abusers being treated for gram-positive endocarditis and bacteremia.

M J Rybak, E M Bailey, K C Lamp, G W Kaatz
M J Rybak
College of Pharmacy and Allied Health Professions, Wayne State University, Detroit, Michigan.
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E M Bailey
College of Pharmacy and Allied Health Professions, Wayne State University, Detroit, Michigan.
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K C Lamp
College of Pharmacy and Allied Health Professions, Wayne State University, Detroit, Michigan.
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G W Kaatz
College of Pharmacy and Allied Health Professions, Wayne State University, Detroit, Michigan.
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DOI: 10.1128/AAC.36.5.1109
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ABSTRACT

The pharmacokinetics and bactericidal killing rates (BR) of daptomycin (D) and vancomycin (V) in 12 intravenous drug abusers (6 treated with daptomycin and 6 treated with vancomycin) were evaluated. Pharmacokinetic parameters were determined from multiple serum samples drawn at steady state over a 12-h dosing interval after intravenous infusions of 3 mg of D per kg of body weight and 1,000 mg of V. The BRs were determined from the 1- and 6-h serum samples by using four isolates of Staphylococcus aureus (three methicillin susceptible and one methicillin resistant) obtained from the patients enrolled in the study. Peak serum daptomycin concentrations were lower and volumes of distribution were higher than reported in healthy volunteers. Although not statistically different, D clearance was 22% higher than reported in healthy volunteers. V pharmacokinetics were similar to those reported in previous studies. Daptomycin's BRs, although comparable to those of V in patients' serum, were significantly decreased compared with those found in broth. This may be related to the high degree of protein binding of D (93% versus 50% for V). Conversely, the BRs of V in serum were significantly greater than those in broth. The BRs of D and V in broth were greater when killing curves were performed with test strains in logarithmic versus stationary-phase growth. The ability to kill organisms in stationary phase may be an important factor in determining the performance of an antibiotic in deep-seated infections such as endocarditis.3+

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Pharmacokinetics and bactericidal rates of daptomycin and vancomycin in intravenous drug abusers being treated for gram-positive endocarditis and bacteremia.
M J Rybak, E M Bailey, K C Lamp, G W Kaatz
Antimicrobial Agents and Chemotherapy May 1992, 36 (5) 1109-1114; DOI: 10.1128/AAC.36.5.1109

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Pharmacokinetics and bactericidal rates of daptomycin and vancomycin in intravenous drug abusers being treated for gram-positive endocarditis and bacteremia.
M J Rybak, E M Bailey, K C Lamp, G W Kaatz
Antimicrobial Agents and Chemotherapy May 1992, 36 (5) 1109-1114; DOI: 10.1128/AAC.36.5.1109
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