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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is an extended-spectrum penicillin antibiotic combined with 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
* Febrile neutropenia (empiric treatment)
## Adult Dosing
* **Standard Dose:** 3.375 grams (3g piperacillin/0.375g tazobactam) or 4.5 grams (4g piperacillin/0.5g tazobactam) intravenously every 6 to 8 hours.
* **Duration:** Typically 4 to 14 days, depending on the indication and clinical response.
* **Maximum Daily Dose:** For severe infections, doses up to 4.5 grams IV every 4 hours have been used, but this is less common and depends on specific clinical scenarios and local protocols.
## Pediatric Dosing
* **Neonates and Infants:** Dosing is complex and depends on gestational age, postnatal age, and indication. Often dosed based on piperacillin component, e.g., 75-100 mg/kg/day divided every 6-8 hours. Consult specific pediatric guidelines.
* **Children:** 100 mg piperacillin/12.5 mg tazobactam per kg per dose intravenously every 8 hours for moderate to severe infections. Maximum dose is typically 4.5 grams (piperacillin/tazobactam) per dose, but pediatric patients may not reach this maximum due to weight-based dosing.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No dose adjustment needed.
* CrCl 20-40 mL/min: Administer usual dose every 8 hours.
* CrCl < 20 mL/min: Administer usual dose every 12 hours.
* For hemodialysis patients, administer usual dose every 12 hours and administer an additional 0.75g dose after each dialysis session.
* **Hepatic Impairment:** No specific dose adjustment is typically recommended, but monitor closely.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillin antibiotics, or any component of the formulation.
* History of cholestatic jaundice or hepatic dysfunction associated with piperacillin/tazobactam.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, constipation, abdominal pain, fever.
* **Serious:**
* Hypersensitivity reactions, including anaphylaxis.
* Clostridioides difficile-associated diarrhea (CDAD).
* Neutropenia, thrombocytopenia, eosinophilia, leukopenia, and prolonged prothrombin time.
* Hepatotoxicity (cholestatic jaundice, hepatitis).
* Seizures (rare, especially with high doses or renal impairment).
* Interstitial nephritis.
## Key Drug Interactions
* **Aminoglycosides:** Potential for synergistic activity but also increased risk of nephrotoxicity. Separate administration if possible.
* **Probenecid:** May increase and prolong serum concentrations of piperacillin.
* **Neuromuscular Blocking Agents:** Piperacillin may prolong the action of vecuronium.
* **Warfarin:** Monitor INR closely as piperacillin may decrease warfarin's effect.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance; monitor methotrexate levels.
## Monitoring
* Renal function (especially with dose adjustments).
* 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 CDAD.
* Clinical signs of infection and culture and sensitivity results.
## Clinical Pearls
* Reconstituted solutions are typically stable for 24 hours at room temperature or 48 hours when refrigerated. Check manufacturer guidelines.
* Administer over at least 30 minutes to reduce risk of infusion-related reactions.
* Dosing for critically ill patients may require higher doses and/or more frequent administration, often guided by pharmacokinetic/pharmacodynamic principles and local protocols.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the official prescribing information and relevant clinical guidelines for the most up-to-date and complete information before prescribing or administering any medication.*
