Please check your internet connection and try again.
# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination antibiotic consisting of piperacillin, an extended-spectrum penicillin, and tazobactam, a beta-lactamase inhibitor. It is active against many Gram-positive, Gram-negative, and anaerobic bacteria.
## 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, based on local guidelines)
## Adult Dosing
* **Standard Dosing:** 3.375 grams (3 g piperacillin/0.375 g tazobactam) or 4.5 grams (4 g piperacillin/0.5 g tazobactam) intravenously every 6 or 8 hours.
* **Serious Infections:** Doses up to 4.5 grams every 4 hours may be used, or continuous infusion at a rate of 0.375 grams/kg/hour up to a maximum of 4.5 grams/hour, with a loading dose of 0.75 grams/kg.
* **Maximum Daily Dose:** Generally capped at 18 grams per day (equivalent to 16 g piperacillin/2 g tazobactam) for intermittent dosing. Higher doses may be used in continuous infusion for severe infections.
* **Duration:** Typically 7-14 days, depending on infection severity and clinical response.
## Pediatric Dosing
* **Patients < 12 years:** Dosing is typically based on piperacillin component: 100 mg/kg/dose piperacillin, administered every 6 to 8 hours. The corresponding tazobactam dose is 12.5 mg/kg/dose.
* **Patients 12 years and older:** Same as adult dosing.
* **Renal Impairment:** Dosing adjustments are necessary for pediatric patients with renal impairment; consult specific pediatric guidelines.
## Dose Adjustments
* **Renal Impairment (Adults):**
* CrCl 20-40 mL/min: Reduce dose frequency to every 8 hours.
* CrCl < 20 mL/min: Reduce dose frequency to every 12 hours.
* For doses requiring 4.5 g every 6 hours, adjust frequency accordingly.
* For continuous infusion, maintain the infusion rate but adjust the total daily amount based on renal function.
* **Hepatic Impairment:** No dose adjustment is typically required.
* **Hemodialysis:** Patients on hemodialysis should receive a dose after each dialysis session. Dosing frequency should be every 8 hours for CrCl >20 mL/min, and every 12 hours for CrCl <20 mL/min, adjusting for dialysis.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillins, cephalosporins, or any component of the formulation.
## Adverse Effects
* **Common:** Diarrhea, rash, nausea, vomiting, headache, insomnia, fever.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), Stevens-Johnson syndrome, toxic epidermal necrolysis, seizures (especially with high doses or renal impairment), neutropenia, thrombocytopenia, elevated liver enzymes, interstitial nephritis.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam plasma concentrations.
* **Neuromuscular Blocking Agents:** May prolong the action of neuromuscular blockers (e.g., vecuronium).
* **Warfarin:** May decrease the effect of warfarin. Monitor INR closely.
* **Methotrexate:** May decrease methotrexate clearance. Monitor methotrexate levels.
* **Aminoglycosides:** Synergistic or additive effects with certain Gram-negative organisms. However, co-administration can lead to inactivation of piperacillin in vitro; administer separately if used together.
## Monitoring
* **Renal Function:** Crucial for dose adjustments.
* **Liver Function Tests:** Monitor for elevations.
* **Hematologic Parameters:** Monitor complete blood count (CBC) for potential neutropenia or thrombocytopenia, especially with prolonged therapy.
* **Electrolytes:** Monitor for potential disturbances, particularly in patients with renal impairment.
* **Signs of Superinfection:** Monitor for development of fungal or bacterial superinfections.
* **Clinical Response:** Assess for improvement in signs and symptoms of infection.
## Clinical Pearls
* Piperacillin/tazobactam covers *Pseudomonas aeruginosa*.
* Reconstituted solutions should be used within 24 hours if refrigerated or within 12 hours at room temperature.
* The addition of tazobactam extends the spectrum of activity to include many beta-lactamase-producing organisms.
* When reconstituting for IV piggyback, use sterile water for injection or compatible IV fluid.
***
**Disclaimer:** This information is intended for clinical use and does not replace professional judgment. Always consult the most current prescribing information and institutional protocols for complete details and specific patient management.
