Please check your internet connection and try again.
# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination penicillin-class antibiotic and a beta-lactamase inhibitor. It is active against a broad spectrum of aerobic and anaerobic gram-positive and gram-negative bacteria, including *Pseudomonas aeruginosa*.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Febrile neutropenia
* Hospital-acquired pneumonia
## Adult Dosing
Standard doses for adults are:
* 3.375 grams (3 grams piperacillin / 0.375 grams tazobactam) intravenously every 6 hours.
* 4.5 grams (4 grams piperacillin / 0.5 grams tazobactam) intravenously every 6 hours. This dose is often used for more severe infections or when targeting *Pseudomonas aeruginosa*.
The maximum daily dose is typically 18 grams (16 grams piperacillin / 2 grams tazobactam) intravenously.
## Pediatric Dosing
Dosing in pediatric patients is based on piperacillin weight-based dosing. Tazobactam is administered in a weight-based ratio to piperacillin.
* **Patients 2 months and older:**
* **Complicated Intra-abdominal Infections:** 100 mg piperacillin/1.25 mg tazobactam per kg of body weight administered every 8 hours. Maximum single dose is 3.375 grams.
* **Nosocomial Pneumonia:** 100 mg piperacillin/1.25 mg tazobactam per kg of body weight administered every 8 hours. Maximum single dose is 3.375 grams. *Note: Some guidelines recommend 100 mg piperacillin/1.25 mg tazobactam per kg every 6 hours for severe infections or targeting Pseudomonas.*
* **Febrile Neutropenia:** 100 mg piperacillin/1.25 mg tazobactam per kg of body weight administered every 8 hours. Maximum single dose is 3.375 grams. *Note: Some guidelines recommend 100 mg piperacillin/1.25 mg tazobactam per kg every 6 hours for severe infections or targeting Pseudomonas.*
Dosing may need to be adjusted for extreme prematurity or in neonates. Consult pediatric infectious disease or specific institutional protocols for neonates.
## Dose Adjustments
* **Renal Impairment:** Dose reduction is necessary for patients with moderate to severe renal impairment (CrCl < 30 mL/min). Consult prescribing information or institutional guidelines for specific adjustments. For CrCl 20-30 mL/min, consider every 8-hour dosing. For CrCl < 20 mL/min, consider every 12-hour dosing. Dosing in hemodialysis patients requires specific adjustments and supplemental doses.
* **Hepatic Impairment:** No dose adjustment is generally required.
## Contraindications
* Known history of hypersensitivity to piperacillin, tazobactam, or other beta-lactam antibiotics.
* History of allergic reaction to penicillin or cephalosporins.
## Adverse Effects
Common adverse effects include diarrhea, nausea, vomiting, rash, headache, insomnia, and elevated liver enzymes. Serious adverse effects include hypersensitivity reactions (anaphylaxis), *Clostridioides difficile*-associated diarrhea, seizures (especially with high doses or renal impairment), and hematologic abnormalities.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Methotrexate:** Piperacillin may decrease methotrexate levels.
* **Warfarin:** Piperacillin may decrease the effect of warfarin; monitor INR.
* **Live attenuated bacterial vaccines:** Piperacillin may reduce the efficacy of these vaccines.
## Monitoring
* Monitor for signs and symptoms of hypersensitivity reactions.
* Monitor for *Clostridioides difficile*-associated diarrhea.
* Monitor renal function and electrolytes, especially in patients with pre-existing renal disease or receiving concomitant nephrotoxic agents.
* Monitor complete blood count for hematologic changes, especially with prolonged therapy.
* Monitor liver function tests.
## Clinical Pearls
* Piperacillin-tazobactam has a broad spectrum of activity, including *Pseudomonas aeruginosa*.
* The ratio of piperacillin to tazobactam is fixed (8:1).
* Tazobactam extends the spectrum of piperacillin by inhibiting beta-lactamases.
* Reconstituted solution should be used within 24 hours when stored at room temperature or within 48 hours when refrigerated.
* For pediatric dosing, confirm the exact total daily piperacillin dose and then calculate the corresponding tazobactam dose based on the 8:1 or 100:1.25 mg/kg ratio. Dosing frequencies may vary based on severity of illness and local protocols.
***
**Disclaimer:** This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information and relevant clinical guidelines before making any treatment decisions. Dosing and indications may vary based on specific patient factors and institutional protocols.
