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# Piperacillin-Tazobactam (Zosyn)
## Overview
Piperacillin-tazobactam is a combination antibiotic consisting of piperacillin, an extended-spectrum penicillin, and tazobactam, a beta-lactamase inhibitor. It has broad-spectrum activity against many gram-positive, gram-negative, 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)
## Adult Dosing
Standard dose: 3.375 g or 4.5 g intravenously every 6 or 8 hours.
* **3.375 g:** Contains 3 g piperacillin and 0.375 g tazobactam.
* **4.5 g:** Contains 4 g piperacillin and 0.5 g tazobactam.
The choice between 6-hour and 8-hour intervals, and the specific dose, depends on the infection severity and pathogen susceptibility. Dosing duration is typically 4-14 days.
## Pediatric Dosing
For patients 12 years and older: Same as adult dosing.
For patients younger than 12 years:
* **Complicated intra-abdominal infections:** 100 mg piperacillin/12.5 mg tazobactam per kg per dose intravenously every 8 hours.
* **Other indications:** 80 mg piperacillin/10 mg tazobactam per kg per dose intravenously every 8 hours.
Maximum dose: 4.5 g every 6 or 8 hours, depending on indication and severity. Dosing is based on piperacillin component.
## Dose Adjustments
* **Renal Impairment (CrCl < 40 mL/min):**
* 3.375 g every 8 hours (usual frequency)
* 4.5 g every 8 hours (usual frequency)
* If infused every 6 hours, may need to extend interval to 8 hours.
* For CrCl < 20 mL/min, consult specific guidelines or package insert for exact dosing recommendations, as frequent dosing may be limited.
* **Hepatic Impairment:** No dose adjustment typically required.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillins, or beta-lactams.
* History of immediate or severe allergic reaction to penicillin-class antibiotics.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, constipation.
* **Serious:**
* *Clostridioides difficile*-associated diarrhea (CDAD).
* Hypersensitivity reactions (including anaphylaxis).
* Seizures (more common with high doses or renal impairment).
* Neutropenia, leukopenia, thrombocytopenia.
* Hepatotoxicity.
* Hemolytic anemia.
## Key Drug Interactions
* **Probenecid:** Can increase and prolong piperacillin-tazobactam serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Warfarin:** May decrease the anticoagulant effect of warfarin. Monitor INR closely.
* **Methotrexate:** May decrease methotrexate clearance. Monitor methotrexate levels.
## Monitoring
* Renal function (creatinine, GFR).
* Liver function tests.
* Complete blood count (CBC) with differential and platelets.
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of *Clostridioides difficile* infection.
* INR if patient is on warfarin.
## Clinical Pearls
* Reconstituted solutions should be used within 24 hours when refrigerated or within 12 hours at room temperature.
* Piperacillin-tazobactam has good activity against *Pseudomonas aeruginosa*.
* The total daily dose is more important than the frequency for initial treatment of severe infections, but frequent dosing may be limited by renal function. Dosing interval should be adjusted for renal impairment.
* Consider empiric therapy for severe infections and narrow the spectrum once culture results are available.
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*This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the official prescribing information and current clinical guidelines for the most up-to-date and comprehensive drug details.*
