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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. It is bactericidal and effective against many Gram-positive, Gram-negative, and anaerobic bacteria, including beta-lactamase producing strains.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Hospital-acquired pneumonia
* Febrile neutropenia (in combination with an aminoglycoside)
## Adult Dosing
Standard doses are typically 3.375 grams every 6 hours or 4.5 grams every 6 or 8 hours IV. Specific dosing and frequency often depend on the indication, severity of infection, and local antibiogram data. Doses are expressed as total piperacillin-tazobactam. Maximum daily dose of piperacillin is generally 18 grams.
## Pediatric Dosing
Dosing is weight-based and depends on the indication and patient age.
* **Infants and Children (excluding neonates):** Doses typically range from 80 mg/kg/day to 300 mg/kg/day of piperacillin component, divided into 3 or 4 doses. For complicated intra-abdominal infections, doses up to 100 mg/kg/dose every 6 hours or 240 mg/kg/day divided q6h of piperacillin component have been used.
* **Neonates:** Dosing in neonates requires careful consideration due to immature renal and hepatic function. Specific protocols should be followed.
## Dose Adjustments
* **Renal Impairment:** Dose reduction is necessary in patients with creatinine clearance < 40 mL/min. Dosing recommendations vary by guidelines and specific CrCl values. Intermittent dosing requires adjustments to the interval or dose. Extended infusion may not require dose adjustment at all CrCl values.
* **Hepatic Impairment:** No specific dose adjustment is usually recommended, but caution is advised as piperacillin is cleared partly by the liver.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillinase-resistant penicillins, or any component of the formulation.
* History of severe allergic reaction (e.g., anaphylaxis) to beta-lactams.
## Adverse Effects
Common adverse effects include diarrhea, nausea, vomiting, rash, pruritus, headache, and insomnia. Serious adverse effects include hypersensitivity reactions (including anaphylaxis), Clostridioides difficile-associated diarrhea, seizures (especially with high doses or renal impairment), and hematologic abnormalities.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin can prolong the neuromuscular blockade.
* **Warfarin:** May decrease the effectiveness of warfarin. Monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate levels. Monitor methotrexate levels.
* **Bacteriostatic antibiotics:** May antagonize the effect of piperacillin-tazobactam.
## Monitoring
* Renal function (creatinine, BUN)
* Liver function tests
* Complete blood count (CBC)
* Signs and symptoms of infection
* Signs of hypersensitivity reactions
* INR if co-administered with warfarin
## Clinical Pearls
* Dosing and administration frequency should be guided by local antibiograms and institutional protocols, especially for severe infections.
* Piperacillin-tazobactam is typically administered via intravenous infusion over 30 minutes. Extended infusion (e.g., 4 hours) may be considered in certain situations, particularly for patients with severe infections or those with renal impairment, as it may achieve higher and more sustained drug concentrations.
* Be aware of the potential for cross-reactivity in patients with penicillin allergy; however, cross-reactivity with cephalosporins is less common than previously thought.
* Discontinue if hypersensitivity or C. difficile infection is suspected.
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*Disclaimer: This information is intended for clinical pharmacy use only. Always consult the most current prescribing information and institutional guidelines for complete details, including contraindications, warnings, adverse effects, drug interactions, and dosing specific to your patient population and clinical scenario.*
