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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination penicillin-class antibiotic and beta-lactamase inhibitor. It is active against a broad spectrum of gram-positive and gram-negative bacteria, including many anaerobes.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Febrile neutropenia (empiric therapy)
## Adult Dosing
* **Standard Dosing:** 3.375 g (piperacillin 3 g / tazobactam 0.375 g) intravenously (IV) every 6 hours or 4.5 g (piperacillin 4 g / tazobactam 0.5 g) IV every 8 hours.
* **Severe Infections/Higher Bacterial Burden:** Dosing may be increased to 4.5 g IV every 6 hours.
* **Maximum Daily Dose:** Not explicitly defined but generally limited by the 4.5 g every 6-hour regimen.
## Pediatric Dosing
Dosing varies significantly by indication and age. **Consult specific pediatric guidelines or a pediatric infectious disease specialist for precise dosing.**
* **General guideline for neonates and infants:** Dosing is often calculated based on piperacillin component per kg per day, divided into multiple doses. For example, 100 mg/kg/day of piperacillin (plus the corresponding tazobactam ratio) divided every 8 hours for less severe infections, or up to 150 mg/kg/day of piperacillin divided every 6 hours for more severe infections. **This is a very general guideline and must be verified.**
## Dose Adjustments
* **Renal Impairment (CrCl < 20 mL/min):** Reduce dose by 1/3 to 1/2 and/or increase interval to every 8 hours. For doses of 3.375 g every 6 hours, consider 2.25 g every 6 hours or 3.375 g every 8 hours. For doses of 4.5 g every 8 hours, consider 2.25 g every 8 hours.
* **Hemodialysis:** Administer dose after dialysis and supplement with an additional dose.
## Contraindications
* Known serious allergic reaction (e.g., anaphylaxis) to piperacillin, other penicillins, cephalosporins, or beta-lactamase inhibitors.
## Adverse Effects
* Diarrhea (most common)
* Rash
* Nausea, vomiting
* Headache
* Insomnia
* Hypersensitivity reactions, including anaphylaxis
* Clostridioides difficile-associated diarrhea
* Hematologic effects (e.g., thrombocytopenia, neutropenia, anemia)
* Elevated liver enzymes
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum levels.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Methotrexate:** May decrease methotrexate levels; monitor methotrexate levels and consider dose adjustment.
* **Warfarin:** May decrease INR; monitor INR closely.
* **Live bacterial vaccines:** May reduce the efficacy of the vaccine.
## Monitoring
* Renal function (for dose adjustment)
* Electrolytes
* Liver function tests
* Complete blood count (CBC) with differential (especially in prolonged therapy or suspected hematologic effects)
* Signs and symptoms of hypersensitivity reactions
* Signs and symptoms of C. difficile infection
## Clinical Pearls
* Piperacillin/tazobactam is a broad-spectrum agent often used for empiric therapy in moderate to severe infections, particularly those suspected to involve resistant organisms.
* Reconstituted solutions should be used within 24 hours when refrigerated or within 12 hours at room temperature.
* The duration of therapy should be guided by the clinical response, organism susceptibility, and local guidelines.
* Ensure adequate hydration to prevent crystalluria.
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*Disclaimer: This information is intended for healthcare professionals. Always verify current prescribing information and consult relevant clinical guidelines before making therapeutic decisions.*
