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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is an extended-spectrum penicillin antibiotic combined with a beta-lactamase inhibitor. It is active against many Gram-positive, Gram-negative, and anaerobic bacteria, including *Pseudomonas aeruginosa*.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Hospital-acquired pneumonia (including ventilator-associated pneumonia)
* Bacterial infections in febrile neutropenic patients (often part of empiric therapy)
## Adult Dosing
* **Standard dose:** 3.375 g every 6 hours or 4.5 g every 8 hours intravenously.
* **Higher doses (e.g., for severe infections, *Pseudomonas*, or penetration into certain sites):** 4.5 g every 6 hours intravenously.
* **Maximum dose:** Typically not to exceed 18 g per day (e.g., 4.5 g every 4 hours). Dosing depends on local protocols and severity of infection.
## Pediatric Dosing
Dosing is weight-based and depends on the indication and age. All doses are for intravenous administration.
* **Patients 0 to < 6 months:** 30 mg piperacillin/kg every 8 hours.
* **Patients 6 months to < 2 years:** 60 mg piperacillin/kg every 6 hours.
* **Patients 2 to < 12 years with body weight < 40 kg:** 240 mg piperacillin/kg/day divided every 6 hours.
* **Patients ≥ 12 years or weighing ≥ 40 kg:** Use adult dosing (3.375 g or 4.5 g every 6 or 8 hours).
*Note: Dosing for neonates and infants < 6 months requires careful consideration due to immature renal function. Dosing may be adjusted based on institutional guidelines.*
## Dose Adjustments
* **Renal Impairment:**
* CrCl ≥ 20 mL/min: No adjustment needed.
* CrCl < 20 mL/min: Reduce dose frequency to every 8 hours (for standard regimens) or every 12 hours (for higher frequency regimens). Standard dose is 3.375g every 8 hours, or 4.5g every 12 hours. Higher frequency regimens (e.g., 4.5g q6h) would be adjusted to 4.5g q8h.
* Hemodialysis: Give a dose of 2.25 g or 3 g every 8 hours and administer an additional 0.75 g dose after each hemodialysis session.
* Peritoneal dialysis: Similar adjustments to renal impairment, consult prescribing information.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillinase-resistant penicillins, or any component of the formulation.
* History of immediate or severe allergic reaction to a beta-lactam antibiotic.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, constipation, increased liver enzymes.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (especially with high doses or renal impairment), neutropenia, thrombocytopenia, interstitial nephritis, acute kidney injury.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum levels.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin can prolong the neuromuscular blockade.
* **Warfarin:** May decrease the effect of warfarin, leading to increased INR. Monitor INR closely.
* **Methotrexate:** Piperacillin may reduce methotrexate clearance; monitor methotrexate levels.
* **Aminoglycosides:** While often co-administered, there is potential for inactivation of piperacillin in vitro by aminoglycosides. Avoid co-administration in the same IV line if possible.
## Monitoring
* Monitor for signs and symptoms of hypersensitivity reactions.
* Monitor for signs of *Clostridioides difficile*-associated diarrhea.
* Monitor renal function (BUN, creatinine) and electrolytes, especially in patients with renal impairment or those receiving concurrent nephrotoxic agents.
* Consider CBC for prolonged use to monitor for hematologic changes.
* Monitor liver function tests.
* For patients on warfarin, monitor INR.
## Clinical Pearls
* Piperacillin/tazobactam is often reconstituted with sterile water for injection and then further diluted in a compatible IV fluid (e.g., 0.9% sodium chloride or 5% dextrose) for infusion.
* Infusion time is typically 30 minutes. Rapid infusion can increase the risk of adverse reactions.
* The tazobactam component is crucial for overcoming resistance mediated by many common beta-lactamases.
* Due to its broad spectrum, piperacillin/tazobactam can disrupt the normal gut flora and increase the risk of *C. difficile* infection.
* Dosing strategies, particularly for severe infections or those requiring high drug concentrations (e.g., *Pseudomonas* in cystic fibrosis), may involve continuous infusions or extended infusions. Consult institutional protocols.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional guidelines for complete details.*
