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# Piperacillin/Tazobactam (Zosyn)
## Overview
Piperacillin/tazobactam is an extended-spectrum penicillin and a beta-lactamase inhibitor combination antibiotic. 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
* Hospital-acquired pneumonia (including ventilator-associated pneumonia)
* Febrile neutropenia (empiric treatment)
## Adult Dosing
* **Complicated Intra-abdominal Infections, Complicated Skin and Skin-Structure Infections, Hospital-Acquired Pneumonia, Ventilator-Associated Pneumonia:** 3.375 grams every 6 hours or 4.5 grams every 6 or 8 hours. Duration typically 4-14 days depending on indication.
* **Community-Acquired Pneumonia:** 3.375 grams every 6 hours. Duration typically 7 days.
* **Febrile Neutropenia:** 4.5 grams every 6 hours. Duration typically 7 days or until resolution of neutropenia and fever.
Dosing and duration are often guided by institutional protocols and clinical judgment.
## Pediatric Dosing
* **3 months and older:**
* **Complicated Intra-abdominal Infections, Community-Acquired Pneumonia, Skin and Skin-Structure Infections:** 100 mg piperacillin / 12.5 mg tazobactam per kg per dose given every 8 hours.
* **Hospital-Acquired Pneumonia, Febrile Neutropenia:** 100 mg piperacillin / 12.5 mg tazobactam per kg per dose given every 6 hours.
* **Maximum dose:** Generally not to exceed 4.5 grams per dose.
Specific dosing may vary based on indication and severity of illness.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No dose adjustment needed.
* CrCl 20-40 mL/min: Reduce dose frequency to every 8 hours for indications dosed every 6 hours.
* CrCl < 20 mL/min: Reduce dose frequency to every 8 hours for indications dosed every 8 hours, and every 12 hours for indications dosed every 6 hours.
* *Note:* Dosing is often adjusted by administering the same total daily dose but at longer intervals.
* **Hepatic Impairment:** No specific dose adjustments are recommended, but caution is advised.
## Contraindications
* Known serious allergy to piperacillin, tazobactam, other penicillins, or beta-lactamase inhibitors.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, constipation, abdominal pain.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), Stevens-Johnson syndrome/toxic epidermal necrolysis, seizures (especially with high doses or renal impairment), interstitial nephritis, hematologic changes (neutropenia, thrombocytopenia, eosinophilia), liver enzyme elevations.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the effect of vecuronium.
* **Warfarin:** May decrease the effect of warfarin; increased monitoring of INR is recommended.
* **Methotrexate:** May decrease methotrexate clearance, leading to increased toxicity.
## Monitoring
* Renal function (baseline and periodically, especially in patients with renal impairment or receiving nephrotoxic agents).
* Liver function (baseline and periodically).
* Electrolytes.
* Complete blood count (especially with prolonged therapy or in febrile neutropenia).
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of *Clostridioides difficile*-associated diarrhea.
## Clinical Pearls
* Piperacillin/tazobactam is a broad-spectrum agent often used for empiric therapy of serious infections, including those caused by resistant organisms like *Pseudomonas aeruginosa*.
* Reconstituted solutions should be used within 24 hours if refrigerated or within 12 hours at room temperature.
* The addition of tazobactam extends the spectrum of activity against many beta-lactamase producing organisms.
* For patients with severe renal impairment and on hemodialysis, an additional dose should be given after each dialysis period.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the official prescribing information and current clinical guidelines for the most up-to-date and comprehensive drug information.*
