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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination penicillin-class antibacterial agent and beta-lactamase inhibitor. It is active against a broad spectrum of aerobic and anaerobic gram-positive and gram-negative bacteria, including *Pseudomonas aeruginosa*.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Febrile neutropenia (in combination with an aminoglycoside)
* Nosocomial intra-abdominal infections
## Adult Dosing
* **Standard Dose:** 3.375 grams IV every 6 hours or 4.5 grams IV every 8 hours.
* **Renal Impairment:** Dose reduction is required for CrCl < 20 mL/min. Consult prescribing information or local protocol for specific adjustments.
* **Maximum Dose:** Typically, 4.5 grams IV every 6 hours.
## Pediatric Dosing
Dosing varies significantly by indication and patient weight.
* **Intra-abdominal Infections (3 months to 12 years):** 100 mg piperacillin/12.5 mg tazobactam per kg IV every 8 hours. Maximum dose of 3.375 grams per dose.
* **Complicated Skin and Skin Structure Infections (3 months to 12 years):** 75 mg piperacillin/9.375 mg tazobactam per kg IV every 8 hours. Maximum dose of 3.375 grams per dose.
* Dosing for patients > 12 years is the same as adult dosing.
* Dosing for febrile neutropenia requires consideration of combination therapy.
* Dose adjustments for renal or hepatic impairment are necessary. Consult prescribing information or local protocol.
## Dose Adjustments
* **Renal Impairment:** Dose reduction and/or increased interval is necessary. Specific recommendations depend on the degree of renal impairment (CrCl < 20 mL/min typically requires adjustment).
* **Hepatic Impairment:** No dose adjustment is generally recommended, but caution is advised.
## Contraindications
* Documented hypersensitivity to piperacillin, tazobactam, other beta-lactam antibiotics, or any component of the formulation.
## Adverse Effects
* Diarrhea (most common)
* Rash, pruritus
* Nausea, vomiting
* Headache
* Insomnia
* Fever, phlebitis
* Increased serum transaminases
* Clostridium difficile-associated diarrhea
* Hypersensitivity reactions, including anaphylaxis
* Seizures (more common with rapid infusion or high doses, especially in renal impairment)
## Key Drug Interactions
* **Probenecid:** May increase and prolong serum concentrations of piperacillin.
* **Neuromuscular blocking agents (e.g., vecuronium):** May prolong neuromuscular blockade.
* **Warfarin:** Piperacillin may decrease the efficacy of warfarin, potentially leading to loss of anticoagulation. Monitor INR closely.
* **Aminoglycosides:** While often used concurrently for synergy, potential for antagonism exists. Compatibility in IV fluids should be verified.
## Monitoring
* Signs and symptoms of infection
* Renal and hepatic function (especially in patients with pre-existing impairment)
* Electrolytes, particularly during prolonged therapy or in patients at risk for imbalance.
* Complete blood count (CBC)
* Signs of hypersensitivity reactions
* For patients on warfarin, monitor INR.
## Clinical Pearls
* Administer by slow IV infusion over at least 30 minutes. Rapid infusion may increase the risk of seizures.
* Ensure adequate hydration to prevent crystalluria, especially with high doses.
* The extended spectrum of activity, including against *Pseudomonas aeruginosa*, makes it a valuable agent in serious infections.
* Consider the potential for antibiotic-associated colitis (e.g., *C. difficile*).
* Cross-reactivity with other penicillin or cephalosporin allergies can occur.
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*Disclaimer: This information is intended for clinical professionals. Always consult the official prescribing information and relevant clinical guidelines for the most current and complete details, as drug information can change.*
