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# Piperacillin-Tazobactam
## Overview
A fixed-dose combination antibiotic consisting of an extended-spectrum penicillin (piperacillin) and a beta-lactamase inhibitor (tazobactam). It provides coverage against Gram-positive, Gram-negative, and anaerobic bacteria, including *Pseudomonas aeruginosa*.
## Primary Indications
* Complicated intra-abdominal infections.
* Nosocomial and ventilator-associated pneumonia.
* Complicated skin and skin structure infections.
* Febrile neutropenia (in combination with aminoglycosides).
* Complicated urinary tract infections.
## Adult Dosing
* **Standard Dosing:** 3.375 g (3 g piperacillin/0.375 g tazobactam) IV every 6 hours.
* **Severe Infections:** 4.5 g (4 g piperacillin/0.5 g tazobactam) IV every 6 hours.
* **Administration:** Infuse over 4 hours for patients with impaired renal function or when treating *Pseudomonas* to maximize time above MIC.
## Pediatric Dosing
* **Neonates (0-9 days):** 80 mg/kg (piperacillin component) every 12 hours.
* **Neonates (10+ days):** 80 mg/kg every 8 hours.
* **Children (≥9 months - 12 years):** 100 mg/kg (piperacillin) every 8 hours.
* **Maximum:** Do not exceed adult maximum dosage. Dosing protocols vary significantly by institution; verify local guidelines before administration.
## Dose Adjustments
* **Renal Impairment (CrCl 20–40 mL/min):** 2.25 g every 6 hours.
* **Renal Impairment (CrCl <20 mL/min):** 2.25 g every 8 hours.
* **Hemodialysis:** 2.25 g every 8 hours + 0.75 g post-dialysis dose.
* **Hepatic Impairment:** No dose adjustment necessary.
## Contraindications
* Known hypersensitivity to piperacillin, tazobactam, or other beta-lactam antibiotics (e.g., penicillins, cephalosporins).
* History of anaphylaxis to any beta-lactam.
## Adverse Effects
* **Common:** Diarrhea, constipation, nausea, headache, insomnia.
* **Serious:** *Clostridioides difficile*-associated diarrhea (CDAD), hypersensitivity reactions (anaphylaxis), hematologic abnormalities (leukopenia, neutropenia, thrombocytopenia with prolonged use), and seizure (primarily at high doses or in severe renal failure).
## Key Drug Interactions
* **Aminoglycosides:** Potential for physical/therapeutic inactivation; administer at least 1 hour apart (though clinical significance is controversial).
* **Probenecid:** Increases serum concentrations of piperacillin by inhibiting renal tubular secretion.
* **Methotrexate:** May increase methotrexate toxicity by reducing renal clearance.
* **Warfarin:** Theoretical risk of increased INR due to alteration of gut flora, though less common than with other antibiotics.
## Monitoring
* **Renal Function:** Monitor serum creatinine and adjust dose accordingly.
* **Hematologic:** Monitor CBC with differential periodically if treatment exceeds 7 days.
* **Electrolytes:** Monitor for hypokalemia, specifically with prolonged use.
* **C. difficile:** Monitor for frequency/severity of stools.
## Clinical Pearls
* **Sodium Content:** Contains approximately 2.8 mEq (64 mg) of sodium per 1 gram of piperacillin; monitor patients on sodium-restricted diets.
* **Extended Infusion:** Prolonged infusion (4 hours) is the preferred method for suspected multidrug-resistant Gram-negative infections to improve pharmacodynamic target attainment.
* **Spectrum:** Does not cover MRSA, *Acinetobacter* (consistently), or organisms producing carbapenemases (KPC/NDM).
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**Educational Disclaimer:** This information is for educational purposes only and does not constitute medical advice. Always refer to your institution’s specific clinical protocols and the official product prescribing information (package insert) before prescribing or administering medication.
