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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination antibiotic consisting of piperacillin, a broad-spectrum penicillin antibiotic, and tazobactam, a beta-lactamase inhibitor. Tazobactam protects piperacillin from degradation by many beta-lactamase enzymes, thereby extending its spectrum of activity.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Febrile neutropenia (as part of combination therapy)
## Adult Dosing
Standard adult dosing is typically 3.375 grams every 6 hours or 4.5 grams every 6 or 8 hours administered intravenously. The frequency and total daily dose may be adjusted based on the severity of infection and patient's clinical status. Dosing for specific indications can vary and should follow local institutional guidelines.
## Pediatric Dosing
* **Children less than 12 years of age:** Dosing varies based on indication and weight. For complicated intra-abdominal infections, a common regimen is 100 mg piperacillin component/12.5 mg tazobactam component per kg per dose intravenously every 8 hours. For children weighing greater than 40 kg, adult doses may be used. Specific dosing for other indications and age groups (e.g., neonates) is often based on limited data and local protocols.
* **Children 12 years of age and older:** Typically receive adult doses.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No adjustment needed.
* CrCl 20-40 mL/min: Reduce dose frequency to every 8 hours.
* CrCl < 20 mL/min: Reduce dose frequency to every 12 hours.
* Hemodialysis: Administer dose every 12 hours and supplement with an additional dose after each hemodialysis session.
* **Hepatic Impairment:** No dose adjustment is generally recommended, but caution is advised.
## Contraindications
* Known history of severe allergic reaction (e.g., anaphylaxis) to piperacillin, tazobactam, or other beta-lactam antibiotics.
## Adverse Effects
Common adverse effects include diarrhea, nausea, vomiting, rash, headache, insomnia, and phlebitis at the injection site. Serious adverse effects can include Clostridioides difficile-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures, and hematologic changes (e.g., neutropenia, thrombocytopenia).
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam plasma concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may reduce the neuromuscular blockade.
* **Warfarin:** Piperacillin may decrease serum concentrations of warfarin. Monitor INR closely.
* **Aminoglycosides:** Coadministration may lead to physical inactivation of the antibiotic. Avoid concurrent administration in the same infusion bag or syringe. Separate administration times if possible.
## Monitoring
* Renal function (baseline and periodically, especially in patients with pre-existing renal impairment or receiving nephrotoxic agents).
* Liver function tests.
* Complete blood count (especially with prolonged therapy).
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of C. difficile infection.
## Clinical Pearls
* Piperacillin-tazobactam has a broad spectrum of activity, including many gram-positive, gram-negative, and anaerobic organisms.
* It is often used empirically for serious infections, including hospital-acquired infections, due to its broad coverage.
* The dose ratio of piperacillin to tazobactam is typically 8:1.
* Ensure adequate hydration and monitor for signs of electrolyte imbalance, especially with prolonged infusions or in patients receiving diuretics.
* Reconstitution and dilution instructions must be followed carefully to ensure stability and prevent precipitation.
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*Disclaimer: This information is intended for healthcare professionals. Always verify the most current prescribing information and consult with a pharmacist or physician for patient-specific recommendations.*
