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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 active against many Gram-positive, Gram-negative, and anaerobic bacteria.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin-structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Febrile neutropenia (in combination with an aminoglycoside in certain high-risk patients)
## Adult Dosing
The usual dose is 3.375 grams (piperacillin 3 grams / tazobactam 0.375 grams) or 4.5 grams (piperacillin 4 grams / tazobactam 0.5 grams) intravenously every 6 or 8 hours.
* **Complicated intra-abdominal infections, complicated skin and skin-structure infections, community-acquired pneumonia:** Typically 3.375 grams every 6 hours or 4.5 grams every 8 hours.
* **Nosocomial pneumonia:** Typically 4.5 grams every 6 hours.
* **Febrile neutropenia:** Typically 4.5 grams every 6 hours, often in combination with an aminoglycoside.
Duration of therapy varies based on indication and clinical response, generally ranging from 7 to 14 days.
## Pediatric Dosing
Dosing for pediatric patients is complex and depends on age, weight, and indication. Dosing is typically calculated on the piperacillin component.
* **Neonates and infants up to 2 months:** Dosing recommendations are not well established and should be based on institutional protocols, often in the range of 100-150 mg piperacillin/kg/day divided every 8-12 hours.
* **Children greater than 2 months:** Dosing is typically 240-300 mg piperacillin/kg/day divided every 6 or 8 hours. The maximum dose per single dose should not exceed the adult dose of 4 grams piperacillin.
## Dose Adjustments
* **Renal Impairment:** Dose reduction and/or increased interval is required for patients with creatinine clearance < 40 mL/min.
* CrCl 20-40 mL/min: 2.25 grams every 6 hours or 3.375 grams every 8 hours.
* CrCl < 20 mL/min: 2.25 grams every 8 hours or 3.375 grams every 12 hours.
* Patients on hemodialysis: 2.25 grams every 8 hours plus a supplemental dose of 0.75 grams after each dialysis session.
* **Hepatic Impairment:** No dose adjustment is typically required.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, or any component of the formulation.
* History of a severe allergic reaction (e.g., anaphylaxis) to a penicillin, cephalosporin, or beta-lactamase inhibitor.
## Adverse Effects
Common adverse effects include diarrhea, rash, nausea, vomiting, headache, insomnia, and elevated liver enzymes. Serious adverse effects include *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures, and interstitial nephritis.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the action of vecuronium.
* **Warfarin:** May decrease INR. Monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance. Monitor methotrexate levels.
## Monitoring
* Renal function (baseline and periodically, especially in patients with pre-existing renal impairment or those receiving nephrotoxic agents).
* Liver function tests.
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of *Clostridioides difficile* infection.
* Clinical signs of infection resolution.
## Clinical Pearls
* Tazobactam protects piperacillin from degradation by many beta-lactamases, extending its spectrum of activity.
* The reconstituted solution is stable for a limited time; check manufacturer instructions for specific storage and administration details.
* Discontinue therapy and institute appropriate treatment if an allergic reaction or *C. difficile*-associated diarrhea occurs.
* Dosing adjustments for renal impairment are crucial to prevent potential neurotoxicity and accumulation.
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*Disclaimer: This information is intended for clinical pharmacists and healthcare professionals. It is essential to consult the most current prescribing information and institutional protocols for definitive guidance. Drug information is dynamic and subject to change.*
