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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination penicillin-class antibacterial and a beta-lactamase inhibitor. It is active against many Gram-positive and Gram-negative aerobic 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
* **Standard Dose:** 3.375 grams (3g piperacillin/0.375g tazobactam) or 4.5 grams (4g piperacillin/0.5g tazobactam) every 6 hours.
* **Dosing Frequency:** Typically every 6 or 8 hours, depending on indication and severity. Continuous infusion is also an option.
* **Maximum Dose:** Generally, do not exceed 4.5 grams every 4 hours (for continuous infusion) or 4.5 grams every 6 hours (for intermittent infusion). Consult specific guidelines for critically ill patients.
## Pediatric Dosing
Dosing is based on the piperacillin component. Consult specific institutional guidelines or pediatric infectious disease resources for precise dosing:
* **Children < 12 years:** 100 mg piperacillin/12.5 mg tazobactam per kg per dose every 6 to 8 hours.
* **Children ≥ 12 years:** Same as adult dosing.
* **Neonates and infants < 1 year:** Dosing is complex and depends on gestational and postnatal age, and renal function. Typically administered every 8 or 12 hours.
## Dose Adjustments
* **Renal Impairment (CrCl < 40 mL/min):** Reduce dose or increase dosing interval. Refer to specific guidelines for precise adjustments.
* **Example (intermittent):** 2.25 grams every 8 hours for CrCl 20-40 mL/min; 2.25 grams every 12 hours for CrCl < 20 mL/min.
* **Hepatic Impairment:** No dose adjustment generally recommended, but use with caution.
## Contraindications
* Known 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, rash, pruritus, eosinophilia, elevated liver enzymes.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (especially with high doses or renal impairment), neutropenia, thrombocytopenia.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam plasma concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Methotrexate:** Piperacillin may decrease methotrexate concentrations.
* **Warfarin:** Monitor INR closely as beta-lactams may affect platelet function.
* **Live vaccines:** Avoid concurrent administration.
## 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 *Clostridioides difficile* infection.
## Clinical Pearls
* Piperacillin/tazobactam provides broad-spectrum coverage and is often a preferred agent for serious infections, especially those involving *Pseudomonas aeruginosa*.
* Reconstituted solutions should be used within specific timeframes at room temperature or refrigerated.
* Tazobactam is not active against all beta-lactamases; resistance can still occur.
* For critically ill patients, consider continuous infusion for improved target site concentrations and reduced toxicity. Dosing for continuous infusion is often based on higher daily doses (e.g., 13.5 grams/1.6875 grams per 24 hours) divided into maintenance and a loading dose.
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**Disclaimer:** This information is intended for clinical pharmacy use and is not a substitute for professional medical advice. Always consult the most current prescribing information and institutional protocols before administering any medication.
