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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination antibiotic consisting of an extended-spectrum penicillin (piperacillin) and a beta-lactamase inhibitor (tazobactam). It is bactericidal and active against a broad spectrum of 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 (in combination with an aminoglycoside in certain patient populations)
## Adult Dosing
The typical adult dose is 3.375 grams every 6 hours or 4.5 grams every 6 or 8 hours IV. Dosing frequency and duration depend on the severity and type of infection, as well as the patient's clinical response. Specific dosing for certain indications like febrile neutropenia may vary based on institutional protocols.
## Pediatric Dosing
Dosing in pediatric patients is based on piperacillin weight.
* **Children weighing 2 months to 12 years:** Dosing typically ranges from 100 mg piperacillin/12.5 mg tazobactam/kg/day to 300 mg piperacillin/37.5 mg tazobactam/kg/day, divided into 4 doses. Maximum dose not to exceed 4.5 grams every 6 hours.
* **Infants younger than 2 months:** Safety and efficacy have not been established.
## Dose Adjustments
* **Renal Impairment:** Adjust dose based on creatinine clearance (CrCl).
* CrCl 20-40 mL/min: Administer 2.25 grams every 6 hours or 3.375 grams every 8 hours.
* CrCl <20 mL/min: Administer 2.25 grams every 8 hours or 3.375 grams every 12 hours.
* Hemodialysis: Administer 2.25 grams every 8 hours. An additional dose of 0.75 grams should be given after each dialysis session.
## Contraindications
* History of allergic reaction to piperacillin, tazobactam, other penicillins, or beta-lactamase inhibitors.
## Adverse Effects
Common adverse effects include diarrhea, nausea, vomiting, rash, headache, insomnia, and pain at the injection site. Serious adverse effects can include hypersensitivity reactions (anaphylaxis), C. difficile-associated diarrhea, seizures, and hematologic abnormalities (e.g., neutropenia, thrombocytopenia).
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam serum concentrations.
* **Neuromuscular blocking agents:** Piperacillin may prolong the action of vecuronium.
* **Warfarin:** Piperacillin may decrease the efficacy of warfarin; monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance; monitor methotrexate levels.
## Monitoring
* Assess for signs and symptoms of infection.
* Monitor renal and hepatic function.
* Monitor for signs of hypersensitivity.
* Monitor complete blood count for potential hematologic changes.
* Monitor for diarrhea and signs of C. difficile infection.
## Clinical Pearls
* Reconstituted solutions should be used within 24 hours when refrigerated or within 12 hours at room temperature.
* Administer IV infusion over at least 30 minutes to reduce the risk of infusion-related reactions.
* Discontinue if a hypersensitivity reaction occurs.
* Be aware of potential cross-reactivity in patients with penicillin allergy.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant clinical guidelines before making therapeutic decisions.*
