# Renal Pharmacokinetics Problem

## Questions provided by Teresa Lewis, Pharm.D.

IO is a 21 year-old Native American female with weight 126 lbs and height 65 in, who has a history of hypertension, diabetes and chronic kidney disease. The serum creatinine (Scr) is 1.77 mg/dL. IO is hospitalized with multidrug-resistant Pseudomonas aeruginosa bacteremia. The team wishes to treat this patient with an investigational antibiotic, Drug P. Drug P possesses concentration dependent bactericidal activity. Normal dosing for Drug P is 8 mg/kg/dose intravenously (IV) every 24 hours. Fractional excretion of Drug P is 0.7

1. Using the Cockcroft-Gault formula, calculate the creatinine clearance for IO (round your answer to the nearest whole number).

2. Calculate the dosage adjustment factor for IO's level of renal dysfunction.

3. Estimate an appropriate dosage regimen for IO? (Round the dosing interval to the nearest 12 hours and the dose to the nearest 10 mg)

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**Some Equations:**

Equation 27.3.1 IBW for Male Patients

Equation 27.3.2 IBW for Female Patients

Equation 27.3.3 Creatinine Clearance (Cockcroft-Gault Equation)

Equation 27.3.4 eGFR (MDRD Eqaution)

Equation 27.3.5 Dose Adjustment Factor

Equation 27.3.6 Adjusted Dosing Interval

Equation 27.3.7 Adjusted Dose

Last update: Sun 21 Apr 2019 08:33:07 pm

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