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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination antibiotic consisting of piperacillin, a broad-spectrum penicillin antibiotic, and tazobactam, a beta-lactamase inhibitor. It is bactericidal and effective against many Gram-positive, Gram-negative, and anaerobic bacteria.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin-structure infections
* Community-acquired pneumonia
* Hospital-acquired pneumonia (including ventilator-associated pneumonia)
* Febrile neutropenia (empiric treatment)
## Adult Dosing
The typical dose is 3.375 grams (3g piperacillin/0.375g tazobactam) or 4.5 grams (4g piperacillin/0.5g tazobactam) administered intravenously every 6 to 8 hours. Duration of therapy is typically 7 to 14 days, depending on the indication and clinical response. Specific dosing frequencies and durations may vary based on local protocols and infection severity.
## Pediatric Dosing
Dosing is based on piperacillin component.
* **1 month to < 12 years:** 90-100 mg piperacillin/11.25-12.5 mg tazobactam per kg per dose administered intravenously every 6 or 8 hours. Maximum dose: 3.375 grams per dose.
* **≥ 12 years:** Dosing is the same as adults.
* In neonates and infants younger than 1 month, dosing recommendations are less established and should follow specific institutional guidelines or expert consultation.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No dose adjustment needed.
* CrCl 20-40 mL/min: Reduce dose frequency to every 8 hours.
* CrCl < 20 mL/min: Reduce dose frequency to every 12 hours.
* Dose adjustments may also be needed in patients on intermittent hemodialysis. Consult specific guidelines.
## Contraindications
* Known severe allergic reaction (e.g., anaphylaxis) to piperacillin, tazobactam, other beta-lactam antibiotics, or penicillin.
## Adverse Effects
Common adverse effects include diarrhea, nausea, vomiting, rash, headache, insomnia, fever, and injection site reactions. Serious adverse effects can include *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures, and hematologic abnormalities.
## Key Drug Interactions
* **Probenecid:** May increase piperacillin-tazobactam serum concentrations.
* **Warfarin:** Piperacillin may decrease the effectiveness of warfarin. Monitor INR closely.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Methotrexate:** Piperacillin may decrease methotrexate serum levels. Monitor methotrexate levels.
## Monitoring
* Monitor for signs and symptoms of hypersensitivity reactions.
* Assess for diarrhea and *Clostridioides difficile* infection.
* Monitor renal and hepatic function, as well as complete blood counts, especially with prolonged therapy or in patients with underlying renal or hepatic impairment.
* For patients on warfarin, monitor INR.
## Clinical Pearls
* Piperacillin-tazobactam has a broad spectrum of activity but is not reliably active against MRSA.
* Reconstituted solutions are stable for a limited time; follow manufacturer recommendations for storage and administration.
* Ensure adequate hydration to minimize the risk of crystalluria.
* Consider the potential for cross-reactivity in patients with penicillin allergies.
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**Disclaimer:** This information is intended for educational purposes and does not substitute for professional medical advice. Always consult the most current prescribing information, institutional guidelines, and a qualified healthcare provider for definitive patient care decisions.
