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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination penicillin-class antibacterial agent and a beta-lactamase inhibitor. It is active against a broad spectrum of 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:** 3.375 grams every 6 hours or 4.5 grams every 8 hours intravenously.
* **Dosage Ratio:** The typical formulation is 8:1 piperacillin to tazobactam.
* **Duration:** Typically 7 to 14 days, depending on the indication and patient response.
## Pediatric Dosing
* **Age ≥ 6 months:** 97.5 mg/kg (piperacillin component) every 8 hours intravenously.
* **Maximum Dose:** Not to exceed the adult maximum dose of 4.5 grams per dose.
* **Duration:** As per adult indications. Dosing for neonates and infants younger than 6 months is not well established and should be guided by specific protocols.
## Dose Adjustments
* **Renal Impairment:**
* CrCl ≥ 50 mL/min: No adjustment needed.
* CrCl 20-50 mL/min: 2.25 grams every 6 hours or 3.375 grams every 8 hours intravenously.
* CrCl < 20 mL/min: 2.25 grams every 8 hours intravenously.
* Dosing in patients on intermittent hemodialysis: 2.25 grams every 8 hours, with an additional dose of 0.75 grams after each dialysis session.
## 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, rash, nausea, vomiting, headache, insomnia, abdominal pain, constipation.
Serious: *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures, hematologic effects (neutropenia, thrombocytopenia), hepatotoxicity, interstitial nephritis.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Warfarin:** May decrease the efficacy of warfarin; monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance; monitor methotrexate levels.
## Monitoring
* Renal function (CrCl) for dose adjustment.
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of *C. difficile*-associated diarrhea.
* Complete blood count (CBC) with differential, especially with prolonged therapy or in immunocompromised patients.
* Liver function tests (LFTs).
* Electrolytes.
## Clinical Pearls
* Piperacillin/tazobactam is a broad-spectrum agent often used for serious bacterial infections, including those caused by resistant organisms.
* Adequate hydration is essential during administration to prevent crystalluria.
* The 8:1 ratio of piperacillin to tazobactam is standard; do not interchange formulations with different ratios without appropriate dose calculation.
* Consider de-escalation to narrower-spectrum agents once culture and susceptibility results are available.
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*This information is intended for healthcare professionals. Always consult the official prescribing information and institutional guidelines for complete and up-to-date details before making any clinical decisions.*
