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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination antibiotic consisting of piperacillin, a broad-spectrum penicillin antibiotic, and tazobactam, a beta-lactamase inhibitor. Tazobactam protects piperacillin from degradation by many bacterial beta-lactamases, extending its spectrum of activity to include many Gram-negative bacteria resistant to piperacillin alone.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Hospital-acquired pneumonia (including ventilator-associated pneumonia)
## Adult Dosing
Standard adult dose is 3.375 grams every 6 hours or 4.5 grams every 6 or 8 hours intravenously. The dose and frequency depend on the severity and type of infection, as well as the site of infection. Dosing for specific indications should follow institutional guidelines and current literature.
## Pediatric Dosing
Dosing is based on piperacillin weight.
* **3 months and older:** 90 to 100 mg of piperacillin component per kg per dose given every 6 hours.
* **For complicated intra-abdominal infections:** 100 mg of piperacillin component per kg per dose every 6 hours.
* **Maximum dose:** 4.5 grams per dose.
## Dose Adjustments
* **Renal Impairment (CrCl > 40 mL/min):** No adjustment needed.
* **Renal Impairment (CrCl 20-40 mL/min):** 2.25 grams every 6 hours or 3.375 grams every 8 hours.
* **Renal Impairment (CrCl < 20 mL/min):** 2.25 grams every 6 hours or 3.375 grams every 12 hours.
* **Hemodialysis:** Administer 2.25 grams every 8 hours, with an additional 0.75 grams dose after each dialysis session.
Dosing for pediatric patients with renal impairment should also be adjusted based on CrCl.
## Contraindications
* Known serious allergic reaction to piperacillin, tazobactam, other penicillin derivatives, or beta-lactamase inhibitors.
## Adverse Effects
* Diarrhea, nausea, vomiting, rash, headache, insomnia, fever, injection site reactions.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (especially with high doses or renal impairment), interstitial nephritis, hemolytic anemia, neutropenia, thrombocytopenia.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam plasma concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the effect of neuromuscular blocking agents.
* **Warfarin:** May decrease the effect of warfarin; monitor INR.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance; monitor methotrexate levels.
## Monitoring
* Renal function (baseline and periodically).
* Liver function tests (periodically).
* Complete blood counts (periodic, especially with prolonged therapy).
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of *Clostridioides difficile*-associated diarrhea.
## Clinical Pearls
* Monitor for signs of superinfection with resistant organisms, particularly *Candida*.
* Dosing for very severe infections or specific pathogens may require higher doses or more frequent administration, which should be guided by institutional protocols and susceptibility data.
* Reconstituted solutions are stable for 24 hours at room temperature or 48 hours under refrigeration. However, stability depends on the diluent used; consult product labeling.
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*This information is intended for healthcare professionals. Always consult the current official prescribing information and institutional guidelines for complete and up-to-date details.*
