PK Considerations

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1
Why is therapeutic drug monitoring used with cefepime?
3x higher trough levels on average in patients who experienced neurotoxicity
2
Dosing for obesity
Choose dosing on the higher end, or extended infusions

note that vancomycin uses a lower dose for obese patients
3
Ideal body weight formula
50+2.3 for every inch over 5 feet (45 for women)
4
AjdW formula (used for obese patients in cockrauf gault)
IBW + 0.4*(ABW-IBW)
5
BMI Formula
kg/m^2

obese is greater than 30
6
What are the bacteriostatic antibiotics?
Macrolides
Tetracyclines
7
What antibiotics are concentration dependent?
Aminoglycosides
Fluoroquinolones

Want 10:1 peak:MIC
8
Why is tobramycin prefered over gentamycin
Higher potency, so giving at the same dose will be more effective, higher peak:MIC
9
target time>MIC for beta lactams for less severe infections and severe infections
>50% for less severe
100% for severe
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