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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, including *Pseudomonas aeruginosa*.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Febrile neutropenia (empiric treatment)
## Adult Dosing
Dosing is based on piperacillin content. Common doses include:
* **3.375 grams** (3g piperacillin/0.375g tazobactam) IV every 6 hours
* **4.5 grams** (4g piperacillin/0.5g tazobactam) IV every 6 or 8 hours
Higher doses, such as **4.5 grams IV every 4 hours**, may be used for severe infections, particularly *Pseudomonas aeruginosa* or *Bacteroides fragilis* infections, or in critically ill patients. Dosing and frequency should be guided by institutional protocols and clinical context.
## Pediatric Dosing
Dosing is based on piperacillin content and patient weight.
* **Neonates and Infants < 2 months:** Dosing is highly variable and complex, often based on gestational and chronological age. Consult specialized pediatric infectious disease resources or guidelines.
* **Children > 2 months:** Generally, **90 mg/kg/day to 100 mg/kg/day of piperacillin component** divided every 6 or 8 hours. Maximum single dose is typically 4 grams of piperacillin component. For *Pseudomonas* infections, higher doses of 100 mg/kg/dose every 6 hours (up to 16 g/day total piperacillin) may be considered.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No adjustment needed.
* CrCl 20-40 mL/min: Give 2/3 of the usual dose every 6 or 8 hours.
* CrCl < 20 mL/min: Give 1/2 of the usual dose every 6 or 8 hours.
* Hemodialysis: Give 1/2 of the usual dose every 8 hours, plus an additional dose after each dialysis session.
* **Hepatic Impairment:** No dose adjustment typically required.
## Contraindications
* Known hypersensitivity to piperacillin, tazobactam, other penicillins, or beta-lactamase inhibitors.
* History of cholestatic jaundice or hepatic dysfunction associated with piperacillin/tazobactam.
## Adverse Effects
* Diarrhea (most common)
* Nausea, vomiting
* Rash, pruritus
* Hypersensitivity reactions (including anaphylaxis)
* *Clostridioides difficile*-associated diarrhea
* Elevated liver enzymes
* Neutropenia, thrombocytopenia, leukopenia (especially with prolonged therapy)
* Seizures (rare, typically with high doses or renal impairment)
## Key Drug Interactions
* **Probenecid:** May increase and prolong serum concentrations of piperacillin.
* **Neuromuscular blocking agents:** Piperacillin may prolong the neuromuscular blockade.
* **Warfarin:** May decrease the effect of warfarin; monitor INR closely.
* **Bacteriostatic antibiotics (e.g., tetracyclines, macrolides):** May potentially antagonize the effect of penicillins.
## Monitoring
* Renal function (baseline and periodically)
* Liver function (baseline and periodically)
* Complete blood count (especially with prolonged therapy)
* Signs and symptoms of hypersensitivity reactions
* Signs and symptoms of *C. difficile* infection
* Therapeutic drug monitoring is generally not required but may be considered in specific situations (e.g., critically ill patients, renal impairment) per institutional guidelines.
## Clinical Pearls
* The reconstituted solution is typically infused over 30 minutes.
* Avoid co-administration with bacteriostatic antibiotics.
* Ensure adequate hydration and electrolytes, especially in patients receiving high doses or with compromised renal function.
* Piperacillin/tazobactam is associated with a higher risk of *C. difficile* infection compared to some other antibiotics.
**Disclaimer:** Always verify current prescribing information, institutional protocols, and guidelines before administering any medication. This information is for educational purposes only and does not substitute for professional clinical judgment.
