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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination penicillin-class antibacterial and a beta-lactamase inhibitor. It is active against many gram-positive and gram-negative aerobic and anaerobic bacteria, including *Pseudomonas aeruginosa*.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin-structure infections
* Community-acquired pneumonia
* Hospital-acquired pneumonia (including ventilator-associated pneumonia)
* Bacterial infections in febrile neutropenic patients (often in combination with an aminoglycoside)
## Adult Dosing
The typical dose ratio is 8:1 piperacillin to tazobactam.
* **Intra-abdominal infections, Skin and skin-structure infections, Community-acquired pneumonia:** 3.375 grams (3 grams piperacillin/0.375 grams tazobactam) every 6 hours or 4.5 grams (4 grams piperacillin/0.5 grams tazobactam) every 8 hours.
* **Hospital-acquired pneumonia, Febrile neutropenia:** 4.5 grams (4 grams piperacillin/0.5 grams tazobactam) every 6 hours or 3.375 grams (3 grams piperacillin/0.375 grams tazobactam) every 6 hours. Higher doses or more frequent administration may be considered for severe infections or *Pseudomonas aeruginosa* based on susceptibility and clinical response.
* **Maximum dose:** Generally 4.5 grams every 6 hours.
## Pediatric Dosing
Dosing is based on piperacillin component.
* **Children younger than 12 years:** Dosing varies by indication and severity. Often ranges from 100 mg/kg/day to 300 mg/kg/day piperacillin divided into 3 or 4 doses. Specific guidelines or local protocols should be consulted.
* **Children 12 years and older:** Similar to adult dosing, 3.375 grams or 4.5 grams every 6 or 8 hours.
## Dose Adjustments
* **Renal impairment (CrCl < 20 mL/min):** Reduce dose frequency. For 3.375g every 6 hours, administer every 8 hours. For 4.5g every 8 hours, administer every 12 hours. Consider further reduction in piperacillin component for severe renal impairment.
* **Hepatic impairment:** No specific dose adjustments are usually required, but monitor liver function.
* **Hemodialysis:** Administer dose after hemodialysis. Supplemental doses may be needed.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillin antibiotics, or any component of the formulation.
* History of immediate or severe allergic reaction to a beta-lactam antibiotic.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, constipation, abdominal pain, fever.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (especially with high doses or renal impairment), hepatotoxicity, neutropenia, thrombocytopenia, hemolytic anemia, interstitial nephritis.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin plasma concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** May prolong neuromuscular blockade.
* **Warfarin:** May decrease INR. Monitor INR closely.
* **Methotrexate:** May decrease methotrexate clearance. Monitor methotrexate levels.
* **Live attenuated bacterial vaccines:** May reduce efficacy.
## Monitoring
* Renal function (baseline and periodically, especially with concurrent nephrotoxic agents).
* Liver function tests.
* Hematologic parameters (e.g., CBC with differential, platelet count), especially with prolonged therapy.
* Signs and symptoms of infection and potential superinfections.
* Electrolytes.
* INR if on warfarin.
## Clinical Pearls
* Duration of therapy is typically 7-14 days depending on severity and clinical response.
* Reconstituted solutions should be used within specified timeframes.
* Can cause a false-positive Direct Coombs test.
* Risk of hypersensitivity reactions is higher in patients with a history of penicillin or cephalosporin allergy.
* For empirical therapy in neutropenic fever, it is often used in combination with an aminoglycoside.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant clinical guidelines for complete details, as recommendations and approved indications can change. Verify current drug information before making any treatment decisions.
