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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination of a broad-spectrum penicillin antibiotic (piperacillin) and a beta-lactamase inhibitor (tazobactam). It is active against many Gram-positive, Gram-negative, and anaerobic bacteria, including many beta-lactamase-producing strains.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections (including diabetic foot 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.
* **Higher Dose for Severe Infections/Nosocomial Pneumonia:** 4.5 grams (4g piperacillin/0.5g tazobactam) IV every 6 or 8 hours.
* **Duration:** Typically 7-14 days, depending on the indication and clinical response.
## Pediatric Dosing
* **Children < 12 years:** Dosing is typically based on piperacillin component and BSA or weight, but specific recommendations vary. A common starting point for serious infections is 80-100 mg piperacillin/kg/dose IV every 6-8 hours.
* **Children ≥ 12 years:** Same as adult dosing.
* **Neonates/Infants < 2 months:** Use with caution; dosing is highly individualized and requires careful consideration of renal function. Consult specialized resources.
## Dose Adjustments
* **Renal Impairment:**
* CrCl ≥ 40 mL/min: No adjustment needed.
* CrCl 20-39 mL/min: 2.25 g IV every 6 hours (or 3.375 g every 8 hours for higher doses).
* CrCl < 20 mL/min: 2.25 g IV every 8 hours (or 3.375 g every 12 hours for higher doses).
* **Hemodialysis:** 2.25 g IV every 8 hours, with an additional 0.75 g dose after each dialysis session.
* **Hepatic Impairment:** No dose adjustment typically required.
## 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, fever, injection site reactions.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (rare, especially with high doses or renal impairment), hematologic abnormalities (e.g., neutropenia, thrombocytopenia), hepatotoxicity.
## Key Drug Interactions
* **Probenecid:** May decrease renal excretion of piperacillin, increasing serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the effect of vecuronium.
* **Warfarin:** Potential for altered anticoagulant effect; monitor INR closely.
* **Methotrexate:** May decrease methotrexate clearance; monitor methotrexate levels.
## Monitoring
* Renal function (baseline and periodically).
* Liver function tests.
* Complete blood count (especially if prolonged therapy or signs of hematologic issues).
* Signs and symptoms of infection for clinical response.
* Signs of hypersensitivity reactions.
* INR if patient is on warfarin.
## Clinical Pearls
* Piperacillin-tazobactam is a potent antibiotic and should be reserved for appropriate indications.
* Ensure adequate hydration during administration.
* Administer IV infusion over at least 30 minutes to reduce the risk of infusion-related reactions.
* Reconstituted solutions are generally stable for 24 hours at room temperature or 48 hours refrigerated, but consult specific product labeling for exact stability information.
* Tazobactam broadens the spectrum of piperacillin to include many beta-lactamase producing organisms, but resistance can still occur.
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*This information is intended for clinical pharmacists and should not replace the most current prescribing information or institutional protocols. Always verify with the official product monograph and consider individual patient factors.*
