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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination antibiotic consisting of an extended-spectrum penicillin (piperacillin) and a beta-lactamase inhibitor (tazobactam). It has broad-spectrum 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
* Nosocomial pneumonia
* Febrile neutropenia (empiric treatment)
## Adult Dosing
* **Standard Dose:** 3.375 grams every 6 hours or 4.5 grams every 6 hours intravenously.
* **Dosing Frequency:** Typically every 6 hours. Extended infusions (e.g., over 4 hours) may improve efficacy in critically ill patients or those with suspected resistance, and local protocols should be consulted.
* **Maximum Dose:** Generally not to exceed 18 grams per day.
## Pediatric Dosing
* **Children younger than 12 years:** Dosing is typically based on piperacillin content (e.g., 100 mg/kg/day of piperacillin divided every 6 or 8 hours). The corresponding tazobactam dose is usually 12.5 mg/kg/day. However, specific pediatric dosing recommendations can vary significantly and depend on the indication and local guidelines. **Always consult specific pediatric guidelines.**
* **Children 12 years and older:** Dosing is often similar to adult dosing (e.g., 3.375 grams or 4.5 grams every 6 hours).
## Dose Adjustments
* **Renal Impairment:** Dose reduction and/or increased dosing interval is required for patients with creatinine clearance < 40 mL/min. Consult prescribing information for specific adjustments.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillins, or any component of the formulation.
* History of immediate or severe allergic reaction to beta-lactam antibiotics.
## Adverse Effects
* Diarrhea, nausea, vomiting, rash, pruritus, headache, insomnia.
* Increased risk of *Clostridioides difficile*-associated diarrhea.
* Hypersensitivity reactions, including anaphylaxis.
* Elevated liver enzymes.
* Seizures (more common with higher doses or renal impairment).
* Hematologic effects (e.g., neutropenia, thrombocytopenia).
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam serum concentrations.
* **Neuromuscular blocking agents:** Piperacillin may prolong the action of vecuronium.
* **Warfarin:** May decrease the effect of warfarin. Monitor INR.
* **Methotrexate:** Penicillins may decrease methotrexate clearance. Monitor methotrexate levels.
## Monitoring
* Renal function (baseline and during therapy, especially in patients with pre-existing renal disease or those receiving nephrotoxic agents).
* Liver function tests.
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of *Clostridioides difficile*-associated diarrhea.
* Complete blood count (CBC) for hematologic changes, particularly with prolonged therapy.
## Clinical Pearls
* Piperacillin-tazobactam has broad-spectrum activity, including coverage of *Pseudomonas aeruginosa*.
* The 3.375 g formulation contains 3 g piperacillin and 0.375 g tazobactam. The 4.5 g formulation contains 4 g piperacillin and 0.5 g tazobactam.
* Ensure adequate hydration and monitor for signs of hypersensitivity.
* Consider de-escalation to a narrower-spectrum agent once culture and susceptibility results are available.
* For febrile neutropenia, treatment duration is typically 7 days or until resolution of neutropenia and fever.
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*This information is intended for healthcare professionals. Always verify current prescribing information and consult relevant guidelines before making any clinical decisions.*
