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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is an extended-spectrum penicillin antibiotic combined with a beta-lactamase inhibitor. It is active against many Gram-positive, Gram-negative, and anaerobic bacteria.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Hospital-acquired pneumonia (including ventilator-associated pneumonia)
* Bacterial meningitis
* Febrile neutropenia
## Adult Dosing
* **Standard Dose:** 3.375 grams (3g piperacillin/0.375g tazobactam) every 6 hours or 4.5 grams (4g piperacillin/0.5g tazobactam) every 6 or 8 hours.
* **Higher Doses:** For severe infections, doses up to 4.5 grams every 4 hours (continuous infusion) may be used.
* **Maximum Daily Dose:** 18 grams (16g piperacillin/2g tazobactam) per day.
* **Continuous Infusion:** Dosing for continuous infusion typically involves a loading dose followed by a continuous infusion, specific protocols vary.
## Pediatric Dosing
* **Neonates and Infants < 12 months:** Dosing is complex and weight-based, often requiring specialized guidelines due to immature renal and hepatic function. A common regimen is 75-100 mg piperacillin/kg/dose every 6-8 hours.
* **Children ≥ 12 months:** 75-100 mg piperacillin/kg/dose every 6 or 8 hours.
* **Maximum Pediatric Dose:** 4.5 grams every 6 or 8 hours (or equivalent daily dose of 18g).
* **Note:** Pediatric dosing often relies on local institutional protocols.
## Dose Adjustments
* **Renal Impairment (CrCl < 20 mL/min):** Reduce frequency to every 8-12 hours. If CrCl < 20 mL/min and receiving continuous infusion, reduce infusion rate.
* **Hemodialysis:** Administer dose after dialysis and reduce frequency to every 8 hours. Administer an additional dose of 2.25g (2g piperacillin/0.25g tazobactam) after each dialysis session.
## Contraindications
* Known severe hypersensitivity to piperacillin, tazobactam, other penicillins, or beta-lactams.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, hypokalemia.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (anaphylaxis), Stevens-Johnson syndrome/toxic epidermal necrolysis, seizures (especially with high doses or renal impairment), interstitial nephritis.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum levels.
* **Neuromuscular Blockers:** May prolong neuromuscular blockade.
* **Warfarin:** May decrease the effect of warfarin, requiring increased monitoring of INR.
* **Methotrexate:** Piperacillin may decrease methotrexate levels; monitor methotrexate levels.
## Monitoring
* Renal function (BUN, creatinine).
* Electrolytes (especially potassium).
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of *C. difficile*-associated diarrhea.
* For prolonged therapy: CBC, liver function tests.
## Clinical Pearls
* Tazobactam inhibits beta-lactamases, extending the spectrum of piperacillin against many beta-lactamase-producing organisms.
* The choice of dosing interval (6 or 8 hours) and infusion method (intermittent or continuous) should be guided by the specific infection, severity, and local antibiogram.
* Continuous infusion may achieve higher drug concentrations and improve outcomes in severe infections, particularly with resistant organisms or in patients with critical illness.
* Reconstituted solutions must be used within 24 hours if refrigerated or within 12 hours at room temperature, depending on the diluent.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the official prescribing information and institutional guidelines for the most current and complete drug details.*
