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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination of an extended-spectrum penicillin antibiotic (piperacillin) and a beta-lactamase inhibitor (tazobactam). It is active against many Gram-positive, Gram-negative, and anaerobic bacteria.
## Primary Indications
Piperacillin/tazobactam is indicated for the treatment of moderate to severe infections caused by susceptible organisms, including:
* Community-acquired pneumonia
* Nosocomial pneumonia
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Uncomplicated skin and skin structure infections
* Complicated urinary tract infections (including pyelonephritis)
* Bacterial meningitis (when other agents are not suitable)
* Febrile neutropenia (empiric treatment)
* Sepsis
## Adult Dosing
The typical dose for adults is 3.375 grams (3g piperacillin/0.375g tazobactam) or 4.5 grams (4g piperacillin/0.5g tazobactam) intravenously every 6 or 8 hours. Dosing frequency and duration depend on the type and severity of infection. In some severe infections, higher doses or more frequent administration may be required, up to 4.5 grams every 4 hours. Specific protocols may guide dosing for indications such as febrile neutropenia or meningitis.
## Pediatric Dosing
Pediatric dosing varies by indication and patient weight. For children less than 12 years of age:
* **Complicated intra-abdominal infections:** 100 mg piperacillin/12.5 mg tazobactam per kg of body weight every 8 hours.
* **Febrile neutropenia:** 75 mg piperacillin/9.375 mg tazobactam per kg of body weight every 6 hours.
For children 12 years of age and older, adult dosing is typically used. Dosing adjustments are necessary for renal impairment.
## Dose Adjustments
**Renal Impairment:**
* CrCl > 40 mL/min: No adjustment needed.
* CrCl 20-40 mL/min: Administer the usual dose every 8 hours (if dosed q6h) or every 12 hours (if dosed q8h).
* CrCl < 20 mL/min: Administer the usual dose every 12 hours (if dosed q6h) or every 12 hours (if dosed q8h).
Dosing for children with renal impairment requires specific adjustments based on age and CrCl.
**Hepatic Impairment:** No specific dose adjustments are recommended.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillins, other beta-lactams, or any component of the formulation.
## Adverse Effects
Common adverse effects include diarrhea, nausea, vomiting, rash, pruritus, headache, insomnia, and elevated liver enzymes. Serious adverse effects can include Clostridioides difficile-associated diarrhea, hypersensitivity reactions (anaphylaxis), seizures (especially with high doses or renal impairment), and hematologic effects (e.g., leukopenia, neutropenia, eosinophilia, thrombocytopenia).
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum concentrations.
* **Neuromuscular blocking agents:** Piperacillin may prolong the action of rocuronium and vecuronium.
* **Warfarin:** Piperacillin may decrease the effect of warfarin; monitor INR closely.
* **Methotrexate:** Penicillins may decrease methotrexate clearance; monitor methotrexate levels.
## Monitoring
* Monitor for signs and symptoms of hypersensitivity reactions.
* Monitor for signs and symptoms of C. difficile infection.
* Monitor renal function, liver function tests, and complete blood counts, especially with prolonged therapy or in patients with impaired renal function.
* Monitor INR if co-administered with warfarin.
* Monitor methotrexate levels if co-administered.
## Clinical Pearls
* Piperacillin/tazobactam has a broad spectrum of activity, making it a valuable agent for empirical therapy in serious infections, especially in patients with risk factors for resistant organisms.
* Tazobactam protects piperacillin from degradation by many beta-lactamases, extending its spectrum of activity.
* Ensure adequate hydration and correct any electrolyte disturbances prior to starting treatment.
* For reconstituted solutions, stability varies by diluent and temperature. Follow manufacturer instructions for preparation and storage.
* Dosing for specific indications (e.g., meningitis, febrile neutropenia) should be guided by institutional protocols or specialized guidelines.
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**Disclaimer:** This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the current prescribing information and institutional guidelines before administering any medication.
