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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination penicillin-class antibacterial and beta-lactamase inhibitor.
## 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 IV every 6 hours or 4.5 grams IV every 8 hours.
* **Severe infections/Nosocomial pneumonia:** 4.5 grams IV every 6 hours.
* Maximum dose generally not specified, but typically derived from piperacillin component.
## Pediatric Dosing
* **1 month to 12 years:** 90 to 100 mg piperacillin component/12.5 mg tazobactam component per kg per dose IV every 6 hours.
* **1 month to 12 years (severe infections/nosocomial pneumonia):** 100 mg piperacillin component/12.5 mg tazobactam component per kg per dose IV every 6 hours.
* **Maximum pediatric dose:** 4.5 grams per dose.
* **Neonates (<1 month):** Dosing is not well established and should be guided by local protocols or specialist consultation, considering immature renal function.
## Dose Adjustments
* **Renal Impairment (CrCl < 40 mL/min):**
* 3.375 gram q6h dose: Administer 2.25 grams IV q8h.
* 4.5 gram q8h dose: Administer 3.375 grams IV q8h.
* *If on intermittent hemodialysis:* Administer an additional dose of 0.75 grams after each dialysis session.
* **Hepatic Impairment:** No dose adjustment recommended.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillinase-resistant penicillins, or any component of the formulation.
* History of immediate and severe allergic reaction to a beta-lactam antibiotic.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, injection site reactions, headache.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (rare, particularly with high doses or renal impairment), interstitial nephritis, hematologic effects (e.g., neutropenia, thrombocytopenia).
## Key Drug Interactions
* **Probenecid:** May decrease renal clearance of piperacillin-tazobactam, leading to increased serum concentrations.
* **Neuromuscular blocking agents:** Piperacillin may prolong the action of vecuronium.
* **Warfarin:** May decrease the effectiveness of warfarin. Monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance. Monitor methotrexate levels.
## Monitoring
* Renal function (baseline and periodically, especially in elderly or those with pre-existing renal disease).
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of *Clostridioides difficile*-associated diarrhea.
* Complete blood counts (especially with prolonged therapy).
* Liver function tests (periodically).
* Culture and sensitivity results to guide therapy.
## Clinical Pearls
* Dosing frequency and duration should be based on the severity of illness, pathogen susceptibility, and patient response.
* Reconstituted solution is stable for a limited time; check manufacturer's recommendations.
* Adequate fluid intake is important, especially in patients with impaired renal function.
* Discontinue if hypersensitivity reaction occurs.
* Empirical therapy duration in febrile neutropenia should be guided by clinical guidelines and patient response.
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*Disclaimer: This information is intended for clinical use and does not replace professional judgment. Always verify current prescribing information with the manufacturer's labeling or other authoritative sources before use.*
