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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.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Febrile neutropenia (empiric treatment)
## Adult Dosing
The typical dose is 3.375 g (piperacillin 3 g / tazobactam 0.375 g) every 6 hours or 4.5 g (piperacillin 4 g / tazobactam 0.5 g) every 6 or 8 hours, administered intravenously over 30 minutes. Higher doses or more frequent administration may be necessary for severe infections or infections due to less susceptible organisms.
## Pediatric Dosing
Dosing varies by indication and age/weight.
* **Infants and Children (2 months to 12 years):** Dosing is typically based on the piperacillin component, ranging from 100 mg/kg/day to 300 mg/kg/day divided into 4 doses. The tazobactam component is dosed at a 1:8 ratio to piperacillin. Maximum dose is generally 4.5 g per dose. Specific dosing requires consultation with pediatric infectious disease guidelines or protocols.
* **Neonates:** Dosing is complex and based on gestational and postnatal age, often requiring specific neonatal protocols.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No dose adjustment needed.
* CrCl 20-40 mL/min: Administer 2.25 g (piperacillin 2 g / tazobactam 0.25 g) every 6 hours or 3.375 g (piperacillin 3 g / tazobactam 0.375 g) every 8 hours.
* CrCl < 20 mL/min: Administer 2.25 g every 8 hours.
* Hemodialysis: Administer 2.25 g every 8 hours and an additional dose of 0.75 g after each dialysis session.
* **Hepatic Impairment:** No specific dose adjustment is typically recommended, but caution is advised.
## Contraindications
Hypersensitivity to piperacillin, tazobactam, other penicillins, or any component of the formulation. History of cholestatic jaundice or hepatic dysfunction associated with prior piperacillin/tazobactam use.
## Adverse Effects
* **Common:** Diarrhea, rash, nausea, vomiting, headache, insomnia, constipation, pruritus, fever.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (anaphylaxis), seizures (especially with high doses or renal impairment), hepatic dysfunction, interstitial nephritis, hematologic changes (neutropenia, thrombocytopenia).
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum concentrations.
* **Neuromuscular blocking agents:** Piperacillin may prolong the action of vecuronium. Monitor neuromuscular blockade.
* **Warfarin:** May decrease the effect of warfarin. Monitor INR.
* **Methotrexate:** Piperacillin may reduce methotrexate clearance. Monitor methotrexate levels.
## Monitoring
* Renal function (baseline and during therapy)
* Liver function tests (baseline and periodically)
* Complete blood count (especially in prolonged therapy)
* Signs and symptoms of hypersensitivity reactions
* Signs and symptoms of *C. difficile*-associated diarrhea
## Clinical Pearls
* Reconstituted solutions should be used within 24 hours when refrigerated or within 12 hours at room temperature, depending on the diluent. Check manufacturer-specific guidelines.
* Tazobactam is a beta-lactamase inhibitor and does not have significant antibacterial activity on its own.
* Adjust dose in renal impairment.
* Monitor for diarrhea, as *C. difficile* infection is a risk.
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*This information is for educational purposes only and does not substitute for professional medical advice. Always verify current prescribing information and consult with a qualified healthcare provider before making any decisions related to medication use.*
