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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination antibiotic consisting of piperacillin, a broad-spectrum penicillin-class antibacterial, and tazobactam, a beta-lactamase inhibitor. Tazobactam protects piperacillin from degradation by many bacterial beta-lactamases, thereby extending its spectrum of activity against beta-lactamase-producing bacteria.
## Primary Indications
* Complicated intra-abdominal infections (cIAI)
* Community-acquired pneumonia (CAP)
* Hospital-acquired pneumonia (HAP), including ventilator-associated pneumonia (VAP)
* Complicated skin and skin structure infections (cSSSI)
* Febrile neutropenia (as part of combination therapy)
* Urinary tract infections (UTI), including pyelonephritis
## Adult Dosing
Dosing is typically expressed as the total piperacillin-tazobactam dose, with the tazobactam component being 1/8th of the piperacillin component.
* **Common Regimens:**
* 3.375 grams every 6 hours IV
* 4.5 grams every 6 hours IV
* **Maximum Daily Dose:** 18 grams (16 grams piperacillin and 2 grams tazobactam) per day, administered as 4.5 grams every 6 hours.
* **Duration:** Typically 7-10 days, but may be shorter for uncomplicated infections or longer for severe infections or specific indications like febrile neutropenia.
## Pediatric Dosing
Dosing varies significantly by age, weight, and indication. Specific protocols should be consulted.
* **Neonates and Infants (up to 3 months):** Dosing is complex and based on gestational and chronological age. Typically ranges from 60 mg/kg/day (piperacillin component) divided into 4 doses.
* **Children (3 months to 12 years):** Dosing is based on the piperacillin component, typically 90 mg/kg/dose (equivalent to 100 mg/kg total piperacillin-tazobactam dose) every 6 hours IV.
* **Maximum pediatric dose:** Generally should not exceed the adult maximum dose.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No dose adjustment needed.
* CrCl 20-40 mL/min: Administer 2.25 grams or 3.375 grams every 8 hours.
* CrCl < 20 mL/min: Administer 2.25 grams every 8 hours or 4.5 grams every 12 hours.
* Hemodialysis: Administer 2.25 grams every 8 hours, with an additional 0.75 grams dose after each hemodialysis session.
## Contraindications
* Known severe hypersensitivity to piperacillin, tazobactam, other beta-lactam antibiotics, or any component of the formulation.
## Adverse Effects
Common: Diarrhea, nausea, vomiting, rash, headache, insomnia, fever, injection site reactions.
Serious: Clostridioides difficile-associated diarrhea, seizures (especially with high doses or renal impairment), hypersensitivity reactions (including anaphylaxis), Stevens-Johnson syndrome, toxic epidermal necrolysis, interstitial nephritis, hematologic effects (e.g., neutropenia, thrombocytopenia, eosinophilia, positive Coombs test), hepatotoxicity.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam plasma concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Warfarin:** May decrease warfarin's anticoagulant effect.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance.
## Monitoring
* Renal function (CrCl) for dose adjustment.
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of C. difficile infection.
* Complete blood count (CBC) for hematologic effects, especially with prolonged therapy.
* Liver function tests (LFTs).
* Therapeutic drug monitoring is generally not required, but may be considered in critically ill patients or those with altered pharmacokinetics.
## Clinical Pearls
* Piperacillin-tazobactam has broad-spectrum activity including many Gram-positive, Gram-negative (including Pseudomonas aeruginosa), and anaerobic bacteria.
* Always reconstitute and dilute according to manufacturer instructions.
* Administer IV infusion over at least 30 minutes. Rapid infusion can increase the risk of seizures.
* Use with caution in patients with a history of allergy to penicillins, cephalosporins, or other beta-lactams.
* Culture and sensitivity testing should be performed before initiating therapy when clinically indicated.
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*Disclaimer: This information is intended for clinical pharmacists and should not replace professional medical advice. Always consult the most current prescribing information and institutional guidelines before making treatment decisions.*
