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. 2023 Feb 28;62(4):573–586. doi: 10.1007/s40262-023-01219-5

Table 5.

Fractional target attainment (FTA) for various dosing regimens of ampicillin-sulbactam to attain fT>MIC ≥ 60% for the sulbactam component against A. baumannii

Ampicillin-sulbactam dosing regimens FTA (%) by bacteria and SeCr (mg/dL)
A. baumannii
SeCr 6 SeCr 2 SeCr 1.5 SeCr 1 SeCr 0.7
a b a b a b a b a b
Empiric FTAs against the whole minimum inhibitory concentration (MIC) distribution
 3 g q24-h bolus × ×
 3 g q24-h infusion × ×
 1.5 g q24-h bolus × ×
 1.5 g q24-h infusion × ×
 3 g q12-h bolus × ×
 3 g q12-h infusion × ×
 1.5 g q12-h bolus × ×
 1.5 g q12-h infusion × ×
 3 g q8-h bolus × × × × × ×
 3 g q8-h infusion × × × × × ×
 1.5 g q6-h bolus × × × × × ×
 1.5 g q6-h infusion × × × × × ×
 3 g q6-h bolus × × × × × ×
 3 g q6-h infusion × × × × × ×
 1.5 g q6-h bolus × × × × × ×
 1.5 g q6-h infusion × × × × × ×
Directed FTAs against the susceptible strains
 3 g q24-h bolus + +
 3 g q24-h infusion + +
 1.5g q24-h bolus + +
 1.5g q24-h infusion + +
 3 g q12-h bolus × +
 3 g q12-h infusion + +
 1.5 g q12-h bolus × × +
 1.5 g q12-h infusion × + +
 3 g q8-h bolus + + + + × × × ×
 3 g q8-h infusion + + + + + +
 1.5 g q8-h bolus × × × × × ×
 1.5 g q8-h infusion + + × + × ×
 3 g q6-h bolus + + + + × ×
 3 g q6-h infusion + + + + + +
 1.5 g q6-h bolus × + × × × ×
 1.5 g q6-h infusion + + + + + +

SeCr serum creatinine; a, simulation at the first dosing regimen; b, simulation at the fifth dosing regimens; −, not simulated; +, could attain FTA ≥ 95%; ×, could not attain FTA ≥ 95%; q24 h, 12 h, 8 h, 6 h indicates the dose is given every 24 h, 12 h, 8 h, 6 h, respectively