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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination penicillin-class antibacterial and beta-lactamase inhibitor. It is bactericidal and has a broad spectrum of 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)
* Febrile neutropenia (empiric treatment)
* Nosocomial infections caused by piperacillin-resistant *Pseudomonas aeruginosa*
## Adult Dosing
* **Standard Dose:** 3.375 grams (3 g piperacillin / 0.375 g tazobactam) intravenously every 6 hours.
* **For *Pseudomonas aeruginosa* or severe infections:** 4.5 grams (4 g piperacillin / 0.5 g tazobactam) intravenously every 6 or 8 hours.
* **Maximum Daily Dose:** Typically 18 grams (13.5 g piperacillin / 4.5 g tazobactam) per day.
* **Duration of Therapy:** Varies based on infection type and severity, typically 7-14 days.
## Pediatric Dosing
* **Children < 1 year:** Dosing is complex and depends on weight, indication, and renal function. Often based on piperacillin component at 50-100 mg/kg/dose (maximum 4.5 g/dose) every 6-8 hours. **Refer to specific institutional guidelines or pediatric infectious disease specialists.**
* **Children ≥ 1 year:** Dosing is typically based on the piperacillin component at 80-100 mg/kg/dose (maximum 4.5 g/dose) every 6-8 hours, with tazobactam given at a 1:8 ratio to piperacillin. **Refer to specific institutional guidelines or pediatric infectious disease specialists.**
## Dose Adjustments
* **Renal Impairment (CrCl > 40 mL/min):** No adjustment needed.
* **Renal Impairment (CrCl 20-40 mL/min):** Reduce dose frequency to every 8 hours.
* **Renal Impairment (CrCl < 20 mL/min):** Reduce dose frequency to every 12 hours.
* **Hemodialysis:** Administer usual dose after dialysis and adjust frequency as above. An additional dose may be needed on dialysis days.
## Contraindications
* Known serious allergy to penicillins, cephalosporins, or beta-lactamase inhibitors.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, thrombophlebitis, eosinophilia, elevated liver enzymes.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (especially with high doses or renal impairment), Stevens-Johnson syndrome/toxic epidermal necrolysis, interstitial nephritis.
## Key Drug Interactions
* **Probenecid:** May increase and prolong serum concentrations of piperacillin-tazobactam.
* **Neuromuscular Blockers (e.g., vecuronium):** Piperacillin may prolong the effect of vecuronium.
* **Warfarin:** May decrease the effect of warfarin, leading to increased INR. Monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance. Monitor methotrexate levels.
## Monitoring
* Renal function (BUN, creatinine) for dose adjustment.
* Liver function tests (AST, ALT).
* Signs and symptoms of infection (fever, WBC count, clinical improvement).
* Signs of hypersensitivity reactions.
* INR if patient is on warfarin.
* *C. difficile* testing if diarrhea develops.
## Clinical Pearls
* Piperacillin-tazobactam has excellent activity against *Pseudomonas aeruginosa*.
* It covers most Gram-positive, Gram-negative (including *Enterobacteriaceae* and *Pseudomonas*), and anaerobic organisms.
* Discontinue if a hypersensitivity reaction occurs.
* Reconstituted solutions are stable for 24 hours at room temperature or 48 hours refrigerated.
* Infusion time is crucial; administer over at least 30 minutes for standard doses and at least 40 minutes for 4.5 g doses to minimize infusion-related reactions.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the official prescribing information and institutional guidelines for the most current and comprehensive details.
