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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination antibiotic consisting of piperacillin, a penicillin-class drug, and tazobactam, a beta-lactamase inhibitor. It has broad-spectrum activity 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 (often as part of empiric therapy)
## Adult Dosing
The usual adult dose is 3.375 grams (3 grams piperacillin/0.375 grams tazobactam) or 4.5 grams (4 grams piperacillin/0.5 grams tazobactam) every 6 or 8 hours intravenously. Duration of therapy depends on the indication and clinical response, typically 7-14 days.
* **Complicated Intra-abdominal Infections:** 3.375 grams IV every 6 hours or 4.5 grams IV every 8 hours.
* **Complicated Skin and Skin Structure Infections:** 3.375 grams IV every 6 hours or 4.5 grams IV every 8 hours.
* **Community-Acquired Pneumonia:** 3.375 grams IV every 6 hours or 4.5 grams IV every 8 hours.
* **Nosocomial Pneumonia:** 3.375 grams IV every 6 hours or 4.5 grams IV every 8 hours. Some guidelines suggest higher doses (e.g., 4.5 grams IV every 6 hours) or extended infusion for severe infections or P. aeruginosa coverage.
* **Febrile Neutropenia:** 4.5 grams IV every 6 hours.
## Pediatric Dosing
Dosing is typically weight-based for piperacillin component and varies by indication. Refer to specific pediatric guidelines for precise dosing.
* **Neonates and Infants (< 2 months):** Dosing is complex and depends on gestational and postnatal age. Consult specialized pediatric resources.
* **Children ≥ 2 months:**
* **Complicated Intra-abdominal Infections:** 100 mg piperacillin/12.5 mg tazobactam per kg per dose IV every 8 hours.
* **Nosocomial Pneumonia:** 100 mg piperacillin/12.5 mg tazobactam per kg per dose IV every 8 hours. Some sources suggest 100 mg piperacillin/12.5 mg tazobactam per kg per dose IV every 6 hours for severe infections or P. aeruginosa.
* **Febrile Neutropenia:** 100 mg piperacillin/12.5 mg tazobactam per kg per dose IV every 6 hours.
* Maximum dose generally not to exceed adult doses.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No adjustment needed.
* CrCl 20-40 mL/min: Reduce dose frequency to every 8 hours.
* CrCl < 20 mL/min: Reduce dose frequency to every 12 hours.
* Hemodialysis: Administer dose every 12 hours and supplement with an additional dose after each dialysis session.
* **Hepatic Impairment:** No dose adjustment is generally recommended, but caution is advised.
## Contraindications
* Known hypersensitivity to piperacillin, tazobactam, other penicillins, or beta-lactams.
* History of cholestatic jaundice or hepatic dysfunction associated with piperacillin/tazobactam.
## Adverse Effects
Common: Diarrhea, nausea, vomiting, headache, insomnia, rash, constipation, fever, rash.
Serious: *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), Stevens-Johnson syndrome/toxic epidermal necrolysis, seizures (especially with high doses or renal impairment), neutropenia, thrombocytopenia, prolonged PT/INR, electrolyte disturbances (hypernatremia with large sodium content).
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam plasma concentrations.
* **Vecuronium:** Piperacillin/tazobactam may prolong the neuromuscular blockade of vecuronium.
* **Warfarin:** May decrease the anticoagulant effect of warfarin; close INR monitoring is essential.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance; monitor methotrexate levels.
## Monitoring
* Renal function (baseline and periodically).
* Liver function tests (baseline and periodically).
* Complete blood count (including platelet count) (baseline and periodically).
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of *C. difficile* infection.
* INR if patient is on warfarin.
## Clinical Pearls
* The sodium content of piperacillin/tazobactam can be significant, especially with high doses or prolonged infusions, posing a risk of hypernatremia and fluid overload, particularly in patients with heart failure or renal impairment.
* Extended or continuous infusion may improve outcomes and reduce resistance, particularly for serious infections or pathogens with reduced susceptibility. Dosing strategies for extended infusion should follow specific protocols.
* Always reconstitute and dilute according to manufacturer instructions. Do not mix with other medications in the same IV line.
* For patients with significant renal impairment or those on hemodialysis, careful dose and frequency adjustments are crucial.
**Disclaimer:** This information is intended for clinical use and is not a substitute for professional medical advice. Always consult the current prescribing information and relevant clinical guidelines for complete details, as dosing and recommendations may vary.
