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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination antibiotic consisting of piperacillin, a penicillinase-susceptible penicillin, and tazobactam, a beta-lactamase inhibitor. It is active against many Gram-positive and Gram-negative bacteria, including many that are resistant to other penicillins.
## Primary Indications
Piperacillin-tazobactam is indicated for the treatment of moderate to severe infections caused by piperacillin-susceptible organisms, including:
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Complicated urinary tract infections, including pyelonephritis
* Bacterial infections in febrile neutropenic patients (in combination with an aminoglycoside)
## Adult Dosing
The typical adult dose is 3.375 grams (3 g piperacillin/0.375 g tazobactam) or 4.5 grams (4 g piperacillin/0.5 g tazobactam) intravenously every 6, 8, or 12 hours, depending on the severity and type of infection and institutional protocols.
* **Complicated intra-abdominal infections:** 3.375 g or 4.5 g IV every 6 or 8 hours. Duration typically 4-7 days.
* **Complicated skin and skin structure infections:** 3.375 g or 4.5 g IV every 6 or 8 hours. Duration typically 7-10 days.
* **Community-acquired pneumonia:** 3.375 g or 4.5 g IV every 6 or 8 hours.
* **Nosocomial pneumonia:** 4.5 g IV every 6 hours.
* **Complicated urinary tract infections:** 3.375 g IV every 8 hours.
* **Febrile neutropenia:** Typically given as 4.5 g IV every 6 hours in combination with an aminoglycoside.
## Pediatric Dosing
Dosing in pediatric patients depends on age, weight, and indication. Dosing is often weight-based.
* **Patients 2 months of age and older:**
* **Complicated intra-abdominal infections:** 80 mg piperacillin (equivalent) / 10 mg tazobactam (equivalent) per kg per dose IV every 6 hours. Maximum dose is 3.375 g per dose. Duration typically 7-10 days.
* **Complicated skin and skin structure infections:** 80 mg piperacillin (equivalent) / 10 mg tazobactam (equivalent) per kg per dose IV every 6 hours. Maximum dose is 3.375 g per dose. Duration typically 7-10 days.
* **Febrile neutropenia:** 80 mg piperacillin (equivalent) / 10 mg tazobactam (equivalent) per kg per dose IV every 6 hours, given with an aminoglycoside. Maximum dose is 3.375 g per dose.
For children weighing > 40 kg, adult dosing is typically used.
## Dose Adjustments
* **Renal Impairment:**
* If CrCl > 40 mL/min: No dose adjustment needed.
* If CrCl 20-40 mL/min: Reduce dose frequency to every 8 hours (for usual 6-hour dosing regimens) or every 12 hours (for usual 8-hour dosing regimens).
* If CrCl < 20 mL/min: Reduce dose frequency to every 12 hours (for usual 6-hour dosing regimens) or every 12 hours (for usual 8-hour dosing regimens).
* Dosing is often given as 2.25 g or 3.375 g every 8 or 12 hours for significant renal impairment.
## Contraindications
Hypersensitivity to piperacillin, tazobactam, other penicillin derivatives, or beta-lactamase inhibitors.
## Adverse Effects
Common adverse effects include diarrhea, nausea, vomiting, rash, headache, insomnia, fever, and elevated liver enzymes. Serious adverse effects can include hypersensitivity reactions (anaphylaxis), C. difficile-associated diarrhea, and seizures (more common with higher doses and in renal impairment).
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the effect of vecuronium. Monitor neuromuscular function.
* **Warfarin:** Piperacillin may decrease the efficacy of warfarin. Monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance. Monitor methotrexate levels.
* **Aminoglycosides:** While often used together, potential for antagonism exists, especially in severe P. aeruginosa infections. Compatibility in IV fluids should be checked.
## Monitoring
* Monitor for signs and symptoms of hypersensitivity reactions.
* Monitor for development of C. difficile-associated diarrhea.
* Monitor renal function, especially in patients with pre-existing renal impairment or those receiving nephrotoxic agents.
* Monitor liver function tests.
* Monitor for therapeutic effectiveness (e.g., fever, white blood cell count, clinical signs of infection).
## Clinical Pearls
* Piperacillin-tazobactam is a broad-spectrum antibiotic with good activity against Pseudomonas aeruginosa.
* Reconstituted solutions are typically stable for 24 hours at room temperature or 48 hours under refrigeration. Follow manufacturer's specific reconstitution and storage guidelines.
* Avoid coadministration with other beta-lactam antibiotics to prevent inactivation, unless specifically indicated and compatible.
* In patients with severe renal impairment, consider reducing the dose and frequency.
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**Disclaimer:** This information is intended for healthcare professionals and does not substitute for professional medical advice. Always consult the most current prescribing information and institutional guidelines before administering any medication.
