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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination penicillin-class antibiotic and beta-lactamase inhibitor. It has a broad spectrum of activity 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
* Febrile neutropenia
## Adult Dosing
* **Standard Dose:** 3.375 grams (3 g piperacillin/0.375 g tazobactam) IV every 6 hours.
* **Higher Dose (for severe infections or suspected resistant organisms):** 4.5 grams (4 g piperacillin/0.5 g tazobactam) IV every 6 or 8 hours.
* **Maximum Dose:** 18 grams per day (4.5 g every 6 hours).
* **Infusion Time:** Over at least 30 minutes. Longer infusions (e.g., 4 hours) may be considered to achieve higher drug concentrations, especially in critically ill patients.
## Pediatric Dosing
* **Infants and Children < 12 years:** Dosing is based on piperacillin component.
* **3 months to 12 years:** 90-100 mg piperacillin/12.5 mg tazobactam per kg per dose IV every 6 or 8 hours.
* **Maximum Dose:** 4.5 grams per dose (4 g piperacillin/0.5 g tazobactam).
* **Infusion Time:** Over 30 minutes.
* **Neonates and Infants < 3 months:** Dosing is not well established; consult specialized pediatric guidelines.
* **Children > 12 years:** Dosing is typically the same as adults.
## Dose Adjustments
* **Renal Impairment (CrCl < 40 mL/min):**
* **3.375 g every 6 hours:** Reduce to 2.25 grams IV every 8 hours.
* **4.5 g every 6 hours:** Reduce to 3.375 grams IV every 8 hours.
* **4.5 g every 8 hours:** Reduce to 2.25 grams IV every 8 hours.
* Consider further dose reduction for CrCl < 20 mL/min.
* Hemodialysis: Administer dose after each dialysis session.
* **Hepatic Impairment:** No specific dose adjustment; monitor liver function.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillins, or beta-lactamase inhibitors.
* History of cholinergic urticaria or allergic reaction to isoflavones.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, fever, elevated liver enzymes.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (especially with renal impairment and high doses), Stevens-Johnson syndrome, toxic epidermal necrolysis, interstitial nephritis, hematologic changes (neutropenia, thrombocytopenia, eosinophilia).
## Key Drug Interactions
* **Probenecid:** Increases and prolongs piperacillin/tazobactam serum levels.
* **Neuromuscular blocking agents (e.g., vecuronium):** May prolong the neuromuscular blockade.
* **Warfarin:** May decrease INR. Monitor INR closely.
* **Methotrexate:** Piperacillin may reduce methotrexate clearance. Monitor methotrexate levels.
## Monitoring
* Renal function (especially with dose adjustments).
* Liver function tests.
* Complete blood count (CBC) for hematologic changes.
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of *C. difficile*-associated diarrhea.
## Clinical Pearls
* Piperacillin/tazobactam is often reconstituted with sterile water or 0.9% sodium chloride and then further diluted in compatible IV fluids (e.g., 0.9% sodium chloride) for infusion.
* Avoid co-administration of piperacillin/tazobactam with bacteriostatic agents as it may antagonize their action.
* The extended infusion of 4 hours can be beneficial in critically ill patients to maximize the time above the minimum inhibitory concentration (T>MIC).
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*This information is intended for healthcare professionals. Always consult the official prescribing information and institutional protocols for complete details and to ensure patient-specific appropriateness.*
