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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination penicillin-class antibacterial agent and a beta-lactamase inhibitor. It is active 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 (hospital-acquired pneumonia)
* Nosocomial intra-abdominal infections
* Febrile neutropenia
## Adult Dosing
* **Standard Dose:** 3.375 grams (3 grams piperacillin/0.375 grams tazobactam) intravenously every 6 hours.
* **Dose for Nosocomial Pneumonia/Infections:** 4.5 grams (4 grams piperacillin/0.5 grams tazobactam) intravenously every 6 or 8 hours. Higher frequency may be used for severe infections.
* **Maximum Dose:** Typically 4.5 grams every 6 hours.
## Pediatric Dosing
* **For patients 2 months of age and older:**
* **Intra-abdominal infections:** 100 mg piperacillin component/12.5 mg tazobactam component per kg body weight intravenously every 6 hours.
* **Nosocomial pneumonia:** 100 mg piperacillin component/12.5 mg tazobactam component per kg body weight intravenously every 6 hours OR 75 mg piperacillin component/9.375 mg tazobactam component per kg body weight intravenously every 8 hours.
* **Maximum Pediatric Dose:** Do not exceed the adult maximum dose of 4.5 grams every 6 hours.
## Dose Adjustments
* **Renal Impairment:** Adjust dose based on creatinine clearance (CrCl).
* CrCl ≥ 50 mL/min: No adjustment needed.
* CrCl 20-50 mL/min: Give usual dose every 8 hours.
* CrCl < 20 mL/min: Give usual dose every 12 hours.
* Hemodialysis: Give usual dose every 12 hours and administer an additional dose after each dialysis session.
* **Hepatic Impairment:** No specific dose adjustment is recommended, but caution is advised.
## Contraindications
* Known serious allergic reaction to piperacillin, tazobactam, other penicillins, or beta-lactamase inhibitors.
## Adverse Effects
Common: Diarrhea, rash, nausea, vomiting, headache, insomnia, constipation.
Serious: Hypersensitivity reactions (including anaphylaxis), Clostridioides difficile-associated diarrhea, seizures (especially with high doses or renal impairment), interstitial nephritis, hepatotoxicity, hematologic changes (e.g., neutropenia, thrombocytopenia).
## Key Drug Interactions
* **Probenecid:** May increase and prolong serum concentrations of piperacillin-tazobactam.
* **Neuromuscular blocking agents:** May prolong neuromuscular blockade.
* **Warfarin:** May decrease the effect of warfarin. Monitor INR closely.
* **Methotrexate:** May decrease methotrexate clearance and increase toxicity. Monitor methotrexate levels.
## Monitoring
* Signs and symptoms of infection resolution.
* Renal function (especially in patients with pre-existing renal disease or those receiving nephrotoxic agents).
* Liver function tests.
* Complete blood count (CBC) for hematologic changes, especially with prolonged therapy.
* Electrolytes.
## Clinical Pearls
* Piperacillin-tazobactam has broad-spectrum activity, including coverage against Pseudomonas aeruginosa.
* Dosing frequency may be guided by clinical response and susceptibility patterns, particularly for severe infections or those caused by less susceptible organisms.
* Reconstituted solutions are typically stable for 24 hours at room temperature or 48 hours under refrigeration. Consult manufacturer's instructions for specific stability.
* Consider the potential for cross-reactivity in patients with penicillin allergies.
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*This information is intended for healthcare professionals. Please consult the official prescribing information and your institution's protocols for the most current and comprehensive guidance.*
