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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination antibiotic consisting of piperacillin, a penicillin-class antibacterial, 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
* Bacterial meningitis (in combination with other agents or when resistance is suspected)
## Adult Dosing
* **Complicated intra-abdominal infections, complicated skin and skin-structure infections, community-acquired pneumonia, and nosocomial pneumonia:**
* **Standard dose:** 3.375 grams (3g piperacillin/0.375g tazobactam) intravenously every 6 hours.
* **Higher dose for severe infections or nosocomial pneumonia:** 4.5 grams (4g piperacillin/0.5g tazobactam) intravenously every 6 or 8 hours. Dosing frequency for 4.5g every 8 hours is typically reserved for nosocomial pneumonia.
## Pediatric Dosing
Dosing in pediatric patients is based on piperacillin weight and depends on the indication and patient age. Refer to specific institutional guidelines or manufacturer prescribing information for detailed pediatric dosing. General guidelines:
* **Patients < 12 years of age:**
* **Complicated skin and skin-structure infections:** 80 to 100 mg piperacillin component/kg/day IV divided every 6 to 8 hours.
* **Intra-abdominal infections:** 200 mg piperacillin component/kg/day IV divided every 6 hours.
* **Neonates and infants < 2 months:** Dosing should be guided by institutional protocols due to immature renal and hepatic function.
## Dose Adjustments
* **Renal Impairment:** Dose reduction or increased dosing interval is required for creatinine clearance < 40 mL/min.
* CrCl 20-40 mL/min: 2.25 grams IV every 6 hours or 3.375 grams IV every 8 hours.
* CrCl < 20 mL/min: 2.25 grams IV every 8 hours.
* For patients on hemodialysis, administer the appropriate dose and supplement with an additional dose after each dialysis session.
* **Hepatic Impairment:** No specific dose adjustment is routinely recommended, but caution is advised.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillin derivatives, or any component of the formulation.
* History of immediate or severe allergic reaction to a beta-lactam antibiotic.
## Adverse Effects
Common adverse effects include diarrhea, nausea, vomiting, rash, headache, insomnia, and eosinophilia. Serious adverse effects include *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (especially with high doses or renal impairment), and neutropenia/thrombocytopenia.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the blockade.
* **Warfarin:** May decrease the anticoagulant effect of warfarin; monitor INR closely.
* **Methotrexate:** May decrease methotrexate levels; monitor methotrexate levels.
## Monitoring
* Renal function (creatinine)
* Liver function tests
* Complete blood count (CBC)
* Signs and symptoms of infection
* Electrolytes
* *Clostridioides difficile* testing if diarrhea develops
## Clinical Pearls
* Piperacillin-tazobactam is a commonly used broad-spectrum antibiotic, particularly effective against *Pseudomonas aeruginosa*.
* The choice between 6-hour and 8-hour dosing for the 4.5g formulation often depends on institutional policy and the severity of the infection, with 8-hour dosing generally reserved for nosocomial pneumonia.
* Ensure adequate hydration to minimize the risk of crystalluria.
* Discontinue immediately if hypersensitivity occurs.
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**Disclaimer:** This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always verify current prescribing information, dosage guidelines, and patient-specific factors before administering any medication.
