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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination antibiotic consisting of piperacillin, a broad-spectrum penicillin antibiotic, and tazobactam, a beta-lactamase inhibitor. It is bactericidal and has a broad spectrum of 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 is 3.375 grams IV every 6 hours or 4.5 grams IV every 8 hours. Dosing and frequency may be adjusted based on severity of infection and local antibiogram. Doses are typically based on the piperacillin component.
* **Complicated intra-abdominal infections:** 3.375 g IV every 6 hours for 7 days.
* **Complicated skin and skin structure infections:** 3.375 g IV every 6 hours for 7-14 days.
* **Community-acquired pneumonia:** 3.375 g IV every 6 hours for 7 days.
* **Nosocomial pneumonia:** 3.375 g IV every 6 hours or 4.5 g IV every 8 hours for 7-14 days.
* **Febrile neutropenia (empiric):** 4.5 g IV every 8 hours. Duration is typically guided by resolution of neutropenia and fever.
Maximum dose is generally 4.5 grams IV every 6 hours.
## Pediatric Dosing
Dosing varies significantly by indication and age/weight. Dosing is typically based on the piperacillin component.
* **Children 2 months and older:**
* **Complicated intra-abdominal infections:** 80-100 mg piperacillin/10 mg tazobactam per kg per dose IV every 6 hours. Maximum dose: 3.375 grams per dose.
* **Febrile neutropenia (empiric):** 100 mg piperacillin/12.5 mg tazobactam per kg per dose IV every 6 hours. Maximum dose: 4.5 grams per dose.
Specific dosing for other indications and younger pediatric patients should be determined based on current guidelines and clinical judgment.
## Dose Adjustments
* **Renal Impairment (CrCl < 40 mL/min):**
* If CrCl is 20-40 mL/min: Administer every 8 hours.
* If CrCl is < 20 mL/min: Administer every 12 hours.
* For doses of 3.375 g every 6 hours, adjust to 2.25 g every 6 hours (CrCl 20-40) or 2.25 g every 8 hours (CrCl < 20).
* For doses of 4.5 g every 8 hours, adjust to 3.375 g every 8 hours (CrCl 20-40) or 3.375 g every 12 hours (CrCl < 20).
* **Hemodialysis:** Administer dose after hemodialysis. Additional doses may be needed.
## Contraindications
* Known severe hypersensitivity to piperacillin, tazobactam, other penicillins, or beta-lactam antibiotics.
* History of cholestatic jaundice or hepatic dysfunction associated with piperacillin-tazobactam therapy.
## Adverse Effects
* **Common:** Diarrhea, rash, nausea, vomiting, headache, insomnia, fever, injection site reactions.
* **Serious:** Anaphylaxis, Clostridioides difficile-associated diarrhea, seizures (especially with renal impairment and high doses), Stevens-Johnson syndrome/toxic epidermal necrolysis, interstitial nephritis, hemolytic anemia.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin plasma concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Warfarin:** May decrease INR. Monitor INR closely.
* **Methotrexate:** May decrease methotrexate serum levels. Monitor methotrexate levels.
## Monitoring
* Renal function (especially with pre-existing renal impairment or concurrent nephrotoxic agents).
* Liver function (baseline and periodically).
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of C. difficile infection.
* Bleeding parameters (if on anticoagulation or with suspected coagulopathy).
## Clinical Pearls
* Piperacillin-tazobactam is reconstituted and typically infused over 30 minutes.
* Consider the spectrum of activity when choosing empirical therapy.
* Renal dose adjustments are crucial to prevent toxicity, particularly seizures.
* Discontinue if hypersensitivity or severe diarrhea occurs.
* Use with caution in patients with a history of allergy to cephalosporins.
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*This information is intended for healthcare professionals and does not replace the need to consult the official prescribing information or other relevant clinical resources before making any treatment decisions.*
