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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. Tazobactam protects piperacillin from degradation by many bacterial beta-lactamases, thus extending its spectrum of activity to include many beta-lactamase-producing bacteria.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Hospital-acquired pneumonia (including ventilator-associated pneumonia)
* Bacterial infections in febrile neutropenic patients (often in combination with an aminoglycoside)
## Adult Dosing
The typical adult dose is **3.375 grams (3 g piperacillin / 0.375 g tazobactam)** or **4.5 grams (4 g piperacillin / 0.5 g tazobactam)** administered intravenously every 6 or 8 hours. Dosing and frequency depend on the severity of infection and patient factors. Total daily piperacillin doses generally range from 12 g to 18 g.
## Pediatric Dosing
For pediatric patients (birth to 12 years of age), the dose is calculated based on piperacillin weight.
* **3.0 g/kg/day (2.7 g piperacillin/0.33 g tazobactam per kg/day) divided into three or four equally divided doses.**
* **Maximum daily dose of piperacillin should not exceed 12 g/day.**
* In neonates and infants younger than 2 months, dosing should be based on gestational and chronological age, and renal and hepatic function. Consult specific guidelines for neonatal dosing.
## Dose Adjustments
* **Renal Impairment:**
* CrCl ≥ 50 mL/min: No adjustment needed.
* CrCl 20-49 mL/min: Administer the usual dose every 8 hours.
* CrCl < 20 mL/min: Administer half the usual dose every 8 hours, or the usual dose every 12 hours.
* Hemodialysis: Administer the usual dose every 8 hours, with an additional dose given during and at the end of each dialysis session.
* **Hepatic Impairment:** No specific dose adjustment is recommended, but caution should be exercised.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillins, or any component of the formulation.
* History of severe immediate hypersensitivity reaction to beta-lactams.
## Adverse Effects
Common adverse effects include diarrhea, nausea, vomiting, rash, headache, insomnia, and abdominal pain. Serious adverse effects include hypersensitivity reactions (including anaphylaxis), Clostridioides difficile-associated diarrhea, seizures, and interstitial nephritis.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the action of vecuronium.
* **Warfarin:** May decrease the effect of warfarin; monitoring of INR is recommended.
* **Methotrexate:** Piperacillin may decrease methotrexate levels. Monitor methotrexate levels.
## Monitoring
* Monitor for signs and symptoms of hypersensitivity reactions.
* Monitor for signs of Clostridioides difficile infection.
* Renal and hepatic function should be monitored periodically.
* Monitor for effectiveness of treatment and development of resistant organisms.
## Clinical Pearls
* Piperacillin/tazobactam is a broad-spectrum agent; however, susceptibility testing is recommended.
* Ensure adequate hydration during administration to prevent crystalluria.
* Discontinue if hypersensitivity, C. difficile-associated diarrhea, or other serious adverse reactions occur.
* Dosing for specific indications and patient populations may vary based on local antibiogram data and institutional protocols.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional guidelines before administering this medication.*
