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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
* Hospital-acquired pneumonia (including ventilator-associated pneumonia)
## Adult Dosing
The typical adult dose is 3.375 grams (3 g piperacillin/0.375 g tazobactam) or 4.5 grams (4 g piperacillin/0.5 g tazobactam) every 6, 8, or 12 hours depending on indication and severity. Dosing frequency and duration are guided by the type and severity of infection, and clinical response.
## Pediatric Dosing
For patients 3 months of age and older:
* **Intra-abdominal infections:** 100 mg piperacillin/12.5 mg tazobactam per kg per dose every 8 hours.
* **Hospital-acquired pneumonia:** 100 mg piperacillin/12.5 mg tazobactam per kg per dose every 8 hours.
* **Complicated skin and skin structure infections:** 75 mg piperacillin/9.375 mg tazobactam per kg per dose every 8 hours.
Maximum dose for pediatric patients is generally 3.375 grams every 6 hours.
## Dose Adjustments
* **Renal Impairment:** Dosing and/or frequency may need to be adjusted in patients with moderate to severe renal impairment (CrCl < 40 mL/min). Refer to specific guidelines or consult renal dosing resources.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillinase-resistant penicillins, or any component of the formulation.
* History of immediate and severe allergic reaction to a beta-lactam antibiotic.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, headache, rash, insomnia, constipation, abdominal pain, fever.
* **Serious:** Clostridioides difficile-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures, hematologic effects (e.g., neutropenia, thrombocytopenia), liver enzyme elevations.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam plasma concentrations.
* **Neuromuscular blocking agents:** May prolong the neuromuscular blockade.
* **Warfarin:** May decrease the effect of warfarin. Monitor INR.
* **Methotrexate:** May increase serum concentrations of methotrexate. Monitor methotrexate levels.
## Monitoring
* Monitor for signs and symptoms of hypersensitivity reactions.
* Monitor for signs and symptoms of C. difficile-associated diarrhea.
* Monitor renal and hepatic function, and complete blood counts, especially with prolonged therapy.
* Assess clinical response to therapy.
## Clinical Pearls
* Piperacillin/tazobactam coversPseudomonas aeruginosa and many anaerobes.
* Reconstituted solutions should be used within 24 hours when refrigerated or within 12 hours at room temperature, depending on the diluent.
* Dosing in critically ill patients, patients with sepsis, or those with significantly altered pharmacokinetics may require further optimization based on institutional protocols or therapeutic drug monitoring.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the official prescribing information and relevant guidelines for complete details before making any clinical decisions.
