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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
* Empirical treatment of febrile neutropenia
## Adult Dosing
Standard dose: 3.375 grams every 6 hours intravenously (IV) for 30 minutes.
Maximum dose: 4.5 grams every 6 hours IV.
Duration of therapy is typically 7 to 14 days, depending on the indication and clinical response. Specific durations may vary based on local guidelines and patient factors.
## Pediatric Dosing
Dosing is based on the piperacillin component.
Children 2 months and older: 90 to 100 mg piperacillin component/kg/dose IV every 6 or 8 hours, not to exceed 4.5 grams per dose.
For febrile neutropenia, doses may be higher (e.g., 100 mg piperacillin component/kg/dose every 6 hours).
Specific pediatric dosing recommendations, especially for neonates and infants, may require consultation with a pediatric infectious disease specialist or reference to specialized pediatric dosing resources.
## Dose Adjustments
**Renal Impairment:**
* CrCl > 40 mL/min: No dose adjustment needed.
* CrCl 20-40 mL/min: 2.25 grams every 6 hours IV.
* CrCl < 20 mL/min: 2.25 grams every 8 hours IV.
* Hemodialysis: 2.25 grams every 8 hours IV, with an additional 0.75-gram dose administered after each dialysis session.
**Hepatic Impairment:**
Dose adjustment is not usually required.
## Contraindications
* Known severe allergic reaction to piperacillin, tazobactam, other penicillins, or beta-lactamase inhibitors.
## Adverse Effects
* Diarrhea
* Nausea
* Rash
* Headache
* Insomnia
* Thrombocytopenia
* Eosinophilia
* Elevated liver enzymes
* *Clostridioides difficile*-associated diarrhea
* Hypersensitivity reactions (including anaphylaxis)
* Seizures (rare, more common with high doses or renal impairment)
## Key Drug Interactions
* **Probenecid:** Can increase and prolong piperacillin/tazobactam serum concentrations.
* **Vecuronium:** Piperacillin may prolong the neuromuscular blockade of vecuronium.
* **Warfarin:** May decrease the efficacy of warfarin. Monitor INR closely.
* **Methotrexate:** May decrease methotrexate clearance. Monitor methotrexate levels.
## Monitoring
* Renal function (creatinine, CrCl)
* Liver function tests (AST, ALT)
* Complete blood count (CBC), including platelet count
* Signs and symptoms of infection and response to therapy
* Signs and symptoms of hypersensitivity reactions
* Monitor for diarrhea, particularly *C. difficile*-associated diarrhea.
## Clinical Pearls
* The reconstitution and dilution of piperacillin/tazobactam require careful attention to manufacturer instructions to ensure correct concentration and avoid precipitation.
* Reconstituted solutions are stable for a limited time at room temperature or refrigerated.
* Discontinue and consider alternative agents if a hypersensitivity reaction occurs.
* Ensure adequate hydration, especially in patients with renal impairment, to minimize the risk of neurotoxicity.
* The potential for cross-reactivity with other beta-lactam antibiotics exists.
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*This information is intended for clinical use and does not replace a thorough review of the current prescribing information, institutional protocols, or clinical judgment.*
