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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 is 3.375 grams (3g piperacillin/0.375g tazobactam) or 4.5 grams (4g piperacillin/0.5g tazobactam) intravenously every 6 or 8 hours. Dosing frequency and duration depend on the indication, severity of infection, and patient response. Higher doses may be used for severe infections.
## Pediatric Dosing
For children 2 months and older:
* **Complicated intra-abdominal infections:** Dosing is based on piperacillin component, typically 80-100 mg/kg per dose administered intravenously every 6 or 8 hours. Maximum dose 4g per dose.
* **Febrile neutropenia:** 100 mg/kg per dose administered intravenously every 8 hours. Maximum dose 4g per dose.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No adjustment needed.
* CrCl 20-40 mL/min: Reduce usual dose by 25% or increase interval to every 8 hours.
* CrCl < 20 mL/min: Reduce usual dose by 50% or increase interval to every 12 hours.
* For intermittent hemodialysis: Administer usual dose, followed by an additional dose after each dialysis session.
* **Hepatic Impairment:** No dose adjustment is typically required.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillins, cephalosporins, or beta-lactams.
* History of cholestatic jaundice or hepatic dysfunction associated with piperacillin-tazobactam use.
## Adverse Effects
Common adverse effects include diarrhea, nausea, vomiting, rash, pruritus, headache, and insomnia. Serious adverse effects include *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures, and hematologic abnormalities.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam serum levels.
* **Neuromuscular blocking agents:** Piperacillin may prolong the action of vecuronium.
* **Warfarin:** May decrease the efficacy of warfarin; monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate levels; monitor methotrexate levels.
* **Vaccines:** Live bacterial vaccines may be less effective.
## Monitoring
* Renal function (especially in patients with pre-existing renal impairment or those receiving nephrotoxic agents).
* Liver function tests.
* Complete blood count, including platelet count.
* Signs and symptoms of infection.
* Signs of hypersensitivity reactions.
* Stool for *C. difficile* if diarrhea develops.
## Clinical Pearls
* Dose, frequency, and duration of therapy should be individualized based on the pathogen(s), site of infection, severity, and patient's clinical status.
* Ensure adequate hydration to prevent crystalluria.
* Consider the possibility of cross-reactivity in patients with penicillin allergy.
* Dosing for intra-abdominal infections may vary based on local guidelines and specific pathogens involved.
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**Disclaimer:** This information is intended for healthcare professionals and does not substitute for a comprehensive review of the full prescribing information and clinical guidelines. Always verify current dosing, indications, contraindications, warnings, precautions, and adverse reactions with the official product monograph or other reliable clinical resources.
