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# Piperacillin-Tazobactam
## Overview
Piperacillin is a broad-spectrum penicillinase-resistant ureidopenicillin. Tazobactam is a beta-lactamase inhibitor that protects piperacillin from degradation by many bacterial beta-lactamases, thus extending its spectrum of activity against beta-lactamase-producing bacteria.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Febrile neutropenia (empiric treatment)
## Adult Dosing
* **Complicated Intra-abdominal Infections, Complicated Skin and Skin Structure Infections, Community-Acquired Pneumonia:** 3.375 grams every 6 hours or 4.5 grams every 8 hours, administered intravenously over 30 minutes.
* **Nosocomial Pneumonia:** 4.5 grams every 6 hours, administered intravenously over 30 minutes.
* **Febrile Neutropenia (Empiric Treatment):** 4.5 grams every 6 hours, administered intravenously over 30 minutes.
* **Maximum daily dose:** Not to exceed 18 grams per day.
Dosing frequency and duration depend on the severity of infection and clinical response.
## Pediatric Dosing
* **Intra-abdominal Infections (Hospitalized Patients ≥ 12 years):** 3.375 grams every 6 hours or 4.5 grams every 8 hours, administered intravenously over 30 minutes.
* **Pediatric patients from 2 months to < 12 years:** Dosing is based on piperacillin weight-based dose: 100 mg piperacillin/12.5 mg tazobactam per kg to 300 mg piperacillin/37.5 mg tazobactam per kg per day, divided into three or four doses. Maximum daily dose of piperacillin should not exceed 13 grams. Maximum single dose of piperacillin should not exceed 4 grams.
* **Neonates and infants < 2 months:** Dosing is not established due to immature renal function.
Dosing is typically guided by institutional protocols.
## Dose Adjustments
* **Renal Impairment:**
* CrCl 20-40 mL/min: 2.25 grams every 6 hours or 3.375 grams every 8 hours.
* CrCl < 20 mL/min: 2.25 grams every 8 hours or 3.375 grams every 12 hours.
* Hemodialysis: Administer the recommended dose at the end of dialysis, and repeat the dose every 8 hours on dialysis days.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillins, or any component of the formulation.
* History of severe allergic reaction (e.g., anaphylaxis) to beta-lactams.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, eosinophilia, elevated liver enzymes (AST, ALT), hypokalemia.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures, hematologic effects (neutropenia, leukopenia, thrombocytopenia), interstitial nephritis, renal failure.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin and tazobactam plasma concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Warfarin:** May decrease the effect of warfarin. Monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance. Monitor methotrexate levels.
## Monitoring
* Renal function (baseline and periodically, especially in patients with pre-existing renal impairment).
* Liver function tests (baseline and periodically).
* Complete blood count (especially in prolonged therapy).
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of *C. difficile*-associated diarrhea.
## Clinical Pearls
* Piperacillin-tazobactam is a potent broad-spectrum agent, but resistance, particularly among Gram-negative organisms, is increasing. Susceptibility testing is crucial.
* Ensure adequate hydration to prevent crystalluria.
* Shake reconstituted solution well before administration.
* Monitor for signs of superinfection.
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**Disclaimer:** This information is intended for clinical use and does not replace professional judgment. Always consult the most current prescribing information and institutional guidelines before making treatment decisions.
