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# Piperacillin-Tazobactam
## Overview
Piperacillin is a broad-spectrum penicillin antibiotic that inhibits bacterial cell wall synthesis. Tazobactam is a beta-lactamase inhibitor that protects piperacillin from degradation by many bacterial beta-lactamases, thereby extending its spectrum of activity.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin-structure infections
* Community-acquired pneumonia
* Hospital-acquired pneumonia
* Febrile neutropenia (in combination with an aminoglycoside)
* Nosocomial pneumonia
## Adult Dosing
Standard adult dose is 3.375 g (3 g piperacillin/0.375 g tazobactam) or 4.5 g (4 g piperacillin/0.5 g tazobactam) intravenously every 6 to 8 hours. Higher doses may be used for severe infections. The maximum daily dose is typically 18 g (16 g piperacillin/2 g tazobactam) for severe infections. Duration of therapy is dependent on the severity of infection and clinical response, typically 7 to 14 days.
## Pediatric Dosing
Dosing is based on piperacillin component:
* **3 months to 12 years:** 90 to 100 mg piperacillin per kg per dose intravenously every 6 to 8 hours. Maximum dose: 4.5 g per dose or 18 g per day.
* **For children weighing > 40 kg:** Use adult dosing.
* **Neonates and infants < 3 months:** Dosing is not well established due to immature renal function; typically managed by specialists.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No adjustment needed.
* CrCl 20-40 mL/min: Administer 2.25 g (2 g piperacillin/0.25 g tazobactam) or 3.375 g (3 g piperacillin/0.375 g tazobactam) every 8 hours.
* CrCl < 20 mL/min: Administer 2.25 g every 8 hours or 4.5 g every 12 hours.
* **Hemodialysis:** Administer 2.25 g every 8 hours, with an additional 0.75 g dose after each dialysis session.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillinase-resistant penicillins, or any component of the formulation.
* History of a severe allergic reaction (e.g., anaphylaxis) to a beta-lactam antibiotic.
## Adverse Effects
Common: Diarrhea, nausea, vomiting, rash, injection site reactions, headache, insomnia, fever, elevated liver enzymes.
Serious: Clostridioides difficile-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures, neutropenia, thrombocytopenia, interstitial nephritis, hepatic dysfunction.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Warfarin:** May decrease the effect of warfarin; increased monitoring of INR is recommended.
* **Methotrexate:** May decrease methotrexate clearance and increase toxicity.
* **Live attenuated bacterial vaccines:** May decrease their efficacy.
## Monitoring
* Renal function (especially in patients with impaired renal function or receiving nephrotoxic agents).
* Liver function tests.
* Complete blood count (CBC) with differential and platelet count (especially with prolonged therapy).
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of Clostridioides difficile infection.
## Clinical Pearls
* Consider local susceptibility patterns when initiating therapy.
* The potential for cross-reactivity with other beta-lactam antibiotics exists.
* Rapid infusion may lead to hypotension. Infusion should be over at least 30 minutes.
* Crystalluria can occur with high doses; ensure adequate hydration.
* If co-administered with an aminoglycoside for febrile neutropenia, administer them separately due to potential physical incompatibility in solution.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the current prescribing information and institutional protocols for complete and up-to-date guidance.*
