Please check your internet connection and try again.
# 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 effective against many gram-positive, gram-negative, and anaerobic bacteria.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Bacterial meningitis (in specific circumstances, often reserved for resistant organisms or when other agents are contraindicated)
## Adult Dosing
* **Standard Dosing:** 3.375 grams intravenously every 6 hours or 4.5 grams intravenously every 8 hours.
* **Higher Dosing (e.g., for nosocomial pneumonia, severe infections):** 4.5 grams intravenously every 6 hours.
* **Maximum Daily Dose:** Typically 18 grams per day.
Dosing frequency and duration depend on the type and severity of infection, and local institutional guidelines.
## Pediatric Dosing
Dosing is based on piperacillin component weight.
* **Infants and Children ≥ 2 months:** 90-100 mg piperacillin component/kg/dose intravenously every 6-8 hours.
* **Maximum Dose:** 4.5 grams/dose or 18 grams/day (whichever is less).
Dosing for neonates and infants < 2 months is complex and requires careful consideration of gestational and postnatal age; specific recommendations are often guided by pharmacokinetic data and institutional protocols.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No adjustment needed.
* CrCl 20-40 mL/min: 2.25 grams IV every 6 hours or 3.375 grams IV every 8 hours.
* CrCl < 20 mL/min: 2.25 grams IV every 8 hours or 3.375 grams IV every 12 hours.
* For doses of 4.5 grams, adjust accordingly (e.g., 3.375 grams IV every 6 hours for CrCl 20-40, and 3.375 grams IV every 8 hours for CrCl < 20).
* **Hemodialysis:** Administer dose after dialysis. Adjust dose as for CrCl < 10 mL/min and provide an additional 0.75 g dose after each dialysis session.
## Contraindications
* Known history of severe allergic reaction (e.g., anaphylaxis) to piperacillin, tazobactam, other penicillin-class drugs, or beta-lactamase inhibitors.
## Adverse Effects
* **Common:** Diarrhea, rash, nausea, vomiting, headache, insomnia.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (especially with renal impairment and high doses), neutropenia, thrombocytopenia, elevated liver enzymes.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum levels.
* **Neuromuscular Blocking Agents (e.g., vecuronium):** Piperacillin can prolong the neuromuscular blockade.
* **Warfarin:** May decrease the effect of warfarin; increased monitoring of INR is recommended.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance; monitor methotrexate levels.
## Monitoring
* Renal function (baseline and periodically).
* Liver function tests (periodically).
* Complete blood count (especially with prolonged therapy).
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of *C. difficile*-associated diarrhea.
* For patients on warfarin, monitor INR closely.
## Clinical Pearls
* Piperacillin/tazobactam is often used empirically for serious infections due to its broad spectrum, including coverage of *Pseudomonas aeruginosa* and many anaerobes.
* Dosing adjustments are crucial in patients with renal impairment.
* Be aware of the potential for hypersensitivity reactions, especially in patients with a history of penicillin allergy. Cross-reactivity with cephalosporins can occur but is less common than within the penicillin class itself.
* The addition of tazobactam extends the spectrum of activity against beta-lactamase-producing organisms.
---
*This information is intended for healthcare professionals. Always verify current prescribing information with the official product monograph or reliable drug information resources before making clinical decisions.*
