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# Piperacillin-Tazobactam
## Overview
Piperacillin is a broad-spectrum penicillinase-resistant penicillin antibiotic, and tazobactam is a beta-lactamase inhibitor. The combination extends the spectrum of piperacillin to include many beta-lactamase producing bacteria.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Febrile neutropenia (empiric treatment)
## Adult Dosing
Standard doses range from 3.375 grams to 4.5 grams every 6 to 8 hours intravenously. The 4.5 gram dose is typically reserved for more severe infections or situations where higher drug concentrations are desired.
* **Complicated Intra-abdominal Infections, Complicated Skin and Skin Structure Infections, Community-Acquired Pneumonia:** 3.375 grams IV every 6 hours or 4.5 grams IV every 8 hours.
* **Nosocomial Pneumonia:** 4.5 grams IV every 6 hours.
* **Febrile Neutropenia (Empiric):** 4.5 grams IV every 6 hours.
Maximum dose is generally 18 grams per day (4.5 grams every 6 hours).
## Pediatric Dosing
Dosing is weight-based and depends on the indication. Actual dosing may vary based on local protocols.
* **Children < 12 years:**
* **Complicated intra-abdominal infections:** 100 mg piperacillin component/12.5 mg tazobactam component per kg per dose IV every 8 hours.
* **Nosocomial pneumonia:** 100 mg piperacillin component/12.5 mg tazobactam component per kg per dose IV every 6 hours.
* **Children ≥ 12 years:** Dosing is the same as adults.
## Dose Adjustments
* **Renal Impairment (CrCl < 20 mL/min):** Reduce dose by 33% to 50% and increase interval to every 8 to 12 hours. Consult specific guidelines for exact adjustments based on CrCl and indication. Dosing above 4.5 grams every 8 hours may require further modification.
* **Hepatic Impairment:** No dose adjustment necessary.
* **Hemodialysis:** Dose every 8 hours with an additional dose after each dialysis session.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, or other beta-lactam antibiotics.
* History of cholestatic jaundice or hepatic dysfunction associated with piperacillin-tazobactam.
## Adverse Effects
Common adverse effects include diarrhea, rash, nausea, vomiting, headache, insomnia, and pruritus. Serious adverse effects include hypersensitivity reactions (anaphylaxis), Clostridioides difficile-associated diarrhea, seizures (especially with high doses or renal impairment), and hematologic changes.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Warfarin:** May decrease warfarin's anticoagulant effect. Monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance. Monitor methotrexate levels.
## Monitoring
* Monitor for signs of hypersensitivity reactions.
* Monitor for signs and symptoms of Clostridioides difficile infection.
* Monitor renal and hepatic function, especially in patients with pre-existing impairment or receiving other nephrotoxic/hepatotoxic agents.
* Monitor complete blood count, including platelet count, due to potential for hematologic changes.
* Monitor INR if patient is on warfarin.
## Clinical Pearls
* Piperacillin-tazobactam has a broad spectrum of activity but should be used judiciously to avoid resistance.
* The 4.5 gram formulation contains 4 grams of piperacillin and 0.5 grams of tazobactam. The 3.375 gram formulation contains 3 grams of piperacillin and 0.375 grams of tazobactam.
* Ensure adequate hydration and monitor for fluid overload, especially with high doses.
* Reconstituted solutions have limited stability; follow manufacturer recommendations for storage and administration.
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*Please verify current prescribing information with the manufacturer's official product information and institutional guidelines before making any clinical decisions.*
