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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination of an extended-spectrum penicillin-class antibacterial and a beta-lactamase inhibitor. It has broad-spectrum activity 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
* **Standard Dose:** 3.375 grams (3g piperacillin/0.375g tazobactam) IV every 6 hours.
* **High Dose (for more severe infections or documented Pseudomonas aeruginosa):** 4.5 grams (4g piperacillin/0.5g tazobactam) IV every 6 hours.
* **Duration:** Typically 7-10 days, but depends on infection severity and clinical response. May be extended for febrile neutropenia.
* **Infusion:** Administer over at least 30 minutes.
## Pediatric Dosing
Dosing is weight-based and depends on the indication and severity of infection. Consult specific pediatric guidelines or institutional protocols.
* **General Range:** 80 mg piperacillin/10 mg tazobactam per kg per dose IV every 6-8 hours.
* **Maximum Dose:** Doses should not exceed the adult maximum of 4.5 grams per dose.
## Dose Adjustments
* **Renal Impairment (CrCl < 40 mL/min):** Reduce dose or increase interval.
* Standard dose: 2.25 grams (2g piperacillin/0.25g tazobactam) IV every 6 hours.
* High dose: 3.375 grams (3g piperacillin/0.375g tazobactam) IV every 6 hours.
* For CrCl < 20 mL/min, further consideration may be needed.
* **Hepatic Impairment:** No dose adjustment typically required, but caution advised.
* **Hemodialysis:** Administer dose after dialysis and supplement.
## Contraindications
* Known history of severe allergic reaction to piperacillin, tazobactam, other penicillins, or beta-lactamase inhibitors.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, constipation, abdominal pain.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), Stevens-Johnson syndrome, toxic epidermal necrolysis, seizures (especially with high doses or renal impairment), hematologic changes (neutropenia, thrombocytopenia, anemia).
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** May prolong neuromuscular blockade.
* **Warfarin:** May decrease INR; closer monitoring of INR is recommended.
* **Methotrexate:** May decrease methotrexate clearance; monitor methotrexate levels.
## Monitoring
* Renal function (baseline and periodically).
* Liver function tests.
* Complete blood count with differential and platelets.
* Signs and symptoms of infection.
* Electrolytes.
* INR if on warfarin.
## Clinical Pearls
* Piperacillin-tazobactam is a very broad-spectrum agent often used for serious infections, including those caused by resistant organisms.
* Due to its broad spectrum, judicious use is encouraged to mitigate resistance.
* Reconstituted solution is stable for 24 hours at room temperature or 48 hours if refrigerated. Further dilution is required for infusion.
* Monitor for signs of hypersensitivity reactions closely, especially during the first dose.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the official prescribing information and institutional guidelines for complete and up-to-date details before prescribing.*
