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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 (as part of combination therapy)
## Adult Dosing
The typical adult dose is 3.375 grams (3g piperacillin/0.375g tazobactam) or 4.5 grams (4g piperacillin/0.5g tazobactam) intravenously every 6 to 8 hours. Dosing frequency and duration depend on the severity and type of infection, patient response, and renal function. For severe infections, higher doses and more frequent administration may be warranted, often guided by institutional protocols.
## Pediatric Dosing
Dosing in pediatric patients is weight-based and depends on age and indication.
* **Intra-abdominal infections:** 100 mg piperacillin/12.5 mg tazobactam per kg per dose IV every 8 hours for patients 2 months to 12 years.
* **Hospital-acquired pneumonia:** 100 mg piperacillin/12.5 mg tazobactam per kg per dose IV every 8 hours for patients 2 months to 12 years.
* **Febrile neutropenia:** 75 mg piperacillin/9.375 mg tazobactam per kg per dose IV every 6 hours for patients 2 months to 12 years.
Maximum doses should not exceed the adult maximums. Dosing for neonates and infants younger than 2 months is not well established and requires careful consideration.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 50 mL/min: No dose adjustment needed.
* CrCl 20-50 mL/min: Administer the usual dose every 8 hours.
* CrCl < 20 mL/min: Administer the usual dose every 12 hours.
* Hemodialysis: Administer the usual dose every 12 hours, and give an additional dose after each dialysis session.
* **Hepatic Impairment:** No specific dose adjustment is typically recommended, but caution is advised.
## Contraindications
* Known history of severe allergic reaction to penicillins, cephalosporins, beta-lactams, or beta-lactamase inhibitors.
## Adverse Effects
Common adverse effects include diarrhea, nausea, vomiting, rash, headache, insomnia, and injection site reactions. Serious adverse effects can include hypersensitivity reactions (anaphylaxis), Clostridioides difficile-associated diarrhea, seizures, and hematologic changes (e.g., neutropenia, thrombocytopenia).
## Key Drug Interactions
* **Probenecid:** May increase piperacillin-tazobactam serum concentrations.
* **Neuromuscular blocking agents:** Piperacillin may prolong the action of these agents.
* **Warfarin:** May decrease the effectiveness of warfarin, requiring increased monitoring of INR.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance, increasing toxicity.
## Monitoring
* Monitor for signs and symptoms of hypersensitivity reactions.
* Assess for signs of C. difficile infection.
* Evaluate renal and hepatic function periodically, especially in patients with pre-existing impairment or receiving prolonged therapy.
* Monitor complete blood counts, particularly in patients at risk for neutropenia or thrombocytopenia.
* Assess for therapeutic response (e.g., resolution of fever, clinical improvement).
## Clinical Pearls
* Piperacillin-tazobactam has a broad spectrum of activity, including Pseudomonas aeruginosa.
* Reconstitution and dilution are required before intravenous administration.
* Avoid concurrent administration with aminoglycosides if possible due to potential inactivation of piperacillin; if combination is necessary, administer separately.
* Dosing adjustments for renal impairment are critical.
* Ensure appropriate monitoring for hypersensitivity reactions and C. difficile infection.
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**Disclaimer:** This information is intended for healthcare professionals and does not replace current prescribing information or professional judgment. Always consult the official drug monograph and relevant guidelines for complete and up-to-date information before making clinical decisions.
