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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. It is bactericidal and effective against many gram-positive, gram-negative, and anaerobic bacteria, including some beta-lactamase-producing strains.
## 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
The typical dose is 3.375 g every 6 hours or 4.5 g every 8 hours. Doses are expressed as the total amount of piperacillin/tazobactam. For more severe infections or those caused by less susceptible organisms, the 4.5 g dose every 8 hours is preferred. Infusion is typically over 30 minutes.
## Pediatric Dosing
Dosing in pediatric patients varies by indication and weight.
* **Neonates and Infants (<12 months):** Dosing is complex and often based on gestational and chronological age. Consult specialized pediatric guidelines or institutional protocols.
* **Children (≥12 months) with complicated intra-abdominal infections:** 100 mg piperacillin component/12.5 mg tazobactam component per kg per dose, every 8 hours. Maximum dose: 3.375 g per dose.
* **Children (≥12 months) with complicated skin and skin-structure infections:** 75 mg piperacillin component/9.375 mg tazobactam component per kg per dose, every 8 hours. Maximum dose: 3.375 g per dose.
* **Pediatric patients with febrile neutropenia:** 100 mg piperacillin component/12.5 mg tazobactam component per kg per dose, every 6 hours. Maximum dose: 4.5 g per dose.
**Note:** Specific pediatric dosing should always be confirmed with current guidelines or institutional protocols, as it can be weight-based and vary by indication and age group.
## Dose Adjustments
* **Renal Impairment:**
* CrCl 50-80 mL/min: Administer usual dose every 8 hours.
* CrCl 20-50 mL/min: Administer 2.25 g every 6 hours or 3.375 g every 8 hours.
* CrCl <20 mL/min: Administer 2.25 g every 8 hours.
* Hemodialysis: Administer 2.25 g every 8 hours, plus an additional dose of 0.75 g after each dialysis session.
## Contraindications
* History of hypersensitivity to piperacillin, tazobactam, other beta-lactam antibiotics, or any component of the formulation.
* Known severe allergic reaction (e.g., anaphylaxis) to penicillin or cephalosporins.
## Adverse Effects
Common: Diarrhea, nausea, vomiting, rash, headache, insomnia, constipation, abdominal pain, rash.
Serious: Clostridioides difficile-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (especially with high doses or renal impairment), interstitial nephritis, hemolytic anemia, leukopenia, neutropenia, thrombocytopenia.
## Key Drug Interactions
* **Probenecid:** Increases serum concentrations of piperacillin and tazobactam.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Warfarin:** May decrease the effect of warfarin. Monitor INR closely.
* **Methotrexate:** May decrease methotrexate levels. Monitor methotrexate levels.
* **Aminoglycosides:** Synergistic or additive effect against certain bacteria; however, there have been reports of inactivation of piperacillin by aminoglycosides *in vitro*. Avoid coadministration in the same IV fluid bag.
## Monitoring
* Renal function (baseline and during therapy, especially with impaired renal function or concomitant nephrotoxic agents).
* Liver function (baseline and periodically).
* Complete blood count (especially with prolonged therapy).
* Signs and symptoms of C. difficile infection.
* Signs and symptoms of hypersensitivity reactions.
## Clinical Pearls
* Tazobactam broadens the spectrum of piperacillin by inhibiting many beta-lactamases.
* Dosing in pediatric patients is complex and often weight-based; confirmation with specific guidelines is essential.
* Dose adjustments are necessary in patients with renal impairment.
* Monitor for hypersensitivity reactions, especially in patients with a history of penicillin or cephalosporin allergy.
* Ensure adequate hydration to minimize the risk of crystalluria.
* Consider the potential for drug interactions, particularly with probenecid and warfarin.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant clinical guidelines for complete and up-to-date details.*
