Please check your internet connection and try again.
# Piperacillin/Tazobactam (Zosyn)
## Overview
Piperacillin/tazobactam is a combination penicillin-class antibiotic and beta-lactamase inhibitor. It has broad-spectrum activity against many Gram-positive, Gram-negative (including *Pseudomonas aeruginosa*), and anaerobic bacteria.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Hospital-acquired pneumonia (including ventilator-associated pneumonia)
* Empirical treatment of febrile neutropenia (often in combination with other agents)
* Other serious infections caused by susceptible organisms.
## Adult Dosing
* **Complicated Intra-abdominal Infections, Complicated Skin and Skin Structure Infections, Hospital-Acquired Pneumonia:** 3.375 grams every 6 hours or 4.5 grams every 8 hours intravenously.
* **Community-Acquired Pneumonia:** 3.375 grams every 6 hours intravenously.
* **Febrile Neutropenia (Empirical):** Typically 4.5 grams every 6 or 8 hours intravenously, often in combination with an aminoglycoside.
* **Maximum Dose:** While higher doses are sometimes used in critical illness or for difficult-to-treat infections, standard doses are generally preferred. Doses exceeding 4.5 grams every 6 hours are not routinely recommended without specific justification.
## Pediatric Dosing
Dosing is based on piperacillin component.
* **Patients 12 years and older:** Same as adult dosing.
* **Patients younger than 12 years:**
* **Complicated Intra-abdominal Infections, Complicated Skin and Skin Structure Infections, Hospital-Acquired Pneumonia:** 90 mg piperacillin/12.5 mg tazobactam per kg per dose intravenously every 6 hours.
* **Community-Acquired Pneumonia:** 90 mg piperacillin/12.5 mg tazobactam per kg per dose intravenously every 6 hours.
* **Empirical treatment of febrile neutropenia:** 90 mg piperacillin/12.5 mg tazobactam per kg per dose intravenously every 6 hours.
* **Maximum Pediatric Dose:** 4.5 grams every 6 hours.
* **Neonates and Infants < 2 months:** Dosing is more complex and often guided by pharmacokinetic data and local protocols. A typical regimen might be 30 mg piperacillin/4.3 mg tazobactam per kg every 8 or 12 hours, depending on gestational and postnatal age.
## Dose Adjustments
* **Renal Impairment (CrCl < 40 mL/min):** Reduce dose frequency.
* For 3.375 g every 6 hours regimen: Administer 2.25 g every 6 hours.
* For 4.5 g every 8 hours regimen: Administer 3.375 g every 8 hours.
* For 4.5 g every 6 hours regimen: Administer 3.375 g every 8 hours.
* **Hemodialysis:** Patients on hemodialysis should receive the dose reduction for renal impairment, and an additional dose should be given after each dialysis session.
* **Hepatic Impairment:** No dose adjustment is typically required.
## Contraindications
* Known serious allergic reaction to piperacillin, tazobactam, other penicillins, cephalosporins, or beta-lactamase inhibitors.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, constipation, rash, fever, phlebitis/thrombophlebitis.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (especially with high doses or renal impairment), interstitial nephritis, hepatic dysfunction, neutropenia, thrombocytopenia, leukopenia.
## 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:** Piperacillin may decrease the effectiveness of warfarin. Monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance. Monitor methotrexate levels.
## Monitoring
* Renal function (BUN, creatinine)
* Liver function tests (LFTs)
* Complete blood count (CBC) with differential and platelets
* Signs and symptoms of hypersensitivity reactions
* Signs and symptoms of *C. difficile* infection
* Prothrombin time/INR if patient is on warfarin.
## Clinical Pearls
* Piperacillin/tazobactam is often a cornerstone for empiric treatment of serious infections, particularly those involving *Pseudomonas aeruginosa*.
* Ensure adequate hydration to minimize the risk of crystalluria.
* Reconstituted solutions should be used within recommended timeframes.
* Tazobactam broadens the spectrum of piperacillin to include many beta-lactamase producing organisms.
* Dosing in critically ill patients may require adjustments based on pharmacokinetic principles (e.g., continuous infusions or higher doses) and should be guided by clinical response and institutional protocols.
***
*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.*
