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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination of a penicillin-class antibacterial (piperacillin) and a beta-lactamase inhibitor (tazobactam). It is a broad-spectrum antibiotic 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 (as empiric therapy)
## Adult Dosing
Standard doses are typically administered over 30 minutes.
* **3.375 g IV every 6 hours:** Commonly used for community-acquired pneumonia and uncomplicated skin and skin structure infections.
* **4.5 g IV every 6 or 8 hours:** Typically used for complicated intra-abdominal infections, complicated skin and skin structure infections, and nosocomial pneumonia.
* **Maximum dose:** 4.5 g IV every 6 hours.
Dosing frequency and duration depend on the severity of infection, pathogen susceptibility, and clinical response.
## Pediatric Dosing
Dosing is based on piperacillin component. Administered IV over 30 minutes.
* **3 months to 12 years:** 100 mg piperacillin/12.5 mg tazobactam per kg per dose IV every 8 hours.
* **12 years and older:** Dosing as per adult.
* **Maximum dose:** 4.5 g per dose (based on piperacillin component) every 6 hours.
Dosing for neonates and infants younger than 3 months is not well established and should be based on institutional guidelines or expert consultation.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No adjustment needed.
* CrCl 20-40 mL/min: 2.25 g (piperacillin 2 g / tazobactam 0.25 g) IV every 6 hours or 4.5 g IV every 8 hours.
* CrCl < 20 mL/min: 2.25 g IV every 8 hours.
* Dose for patients on hemodialysis: 2.25 g IV every 8 hours, plus an additional dose after each dialysis session.
Adjustments for hepatic impairment are generally not required.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, any other penicillin, or any component of the formulation.
* History of a severe allergic reaction (e.g., anaphylaxis) to beta-lactams.
## Adverse Effects
* **Common:** Diarrhea, rash, nausea, vomiting, headache, insomnia, constipation, abdominal pain.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (especially with high doses or renal impairment), hematologic changes (e.g., neutropenia, thrombocytopenia), hepatotoxicity.
## Key Drug Interactions
* **Probenecid:** May increase piperacillin-tazobactam serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Warfarin:** May decrease the effect of warfarin; monitor INR.
* **Methotrexate:** May decrease methotrexate clearance; monitor methotrexate levels.
## Monitoring
* **Renal function:** Baseline and periodically, especially in patients with known renal impairment or those receiving nephrotoxic agents.
* **Liver function:** Baseline and periodically.
* **Hematologic parameters:** Complete blood count with differential, especially with prolonged therapy.
* **Signs of *Clostridioides difficile*-associated diarrhea:** Assess stool for presence of *C. difficile* toxin if diarrhea develops.
* **Clinical signs of infection:** Monitor for improvement in signs and symptoms of infection.
* **Electrolytes:** Especially in patients with risk factors for imbalances.
## Clinical Pearls
* Piperacillin-tazobactam covers a wide spectrum, including *Pseudomonas aeruginosa*.
* The beta-lactamase inhibitor tazobactam extends the spectrum of piperacillin against many beta-lactamase-producing organisms.
* When reconstituting, use appropriate diluents as per manufacturer instructions.
* Administer IV infusions over the recommended time to minimize risk of infusion-related reactions.
* Discontinue if hypersensitivity reaction occurs.
* Consider dose adjustment in renal impairment.
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This information is for educational purposes and is not a substitute for professional medical advice. Always consult the most current prescribing information and your healthcare provider for any medical concerns or before making any decisions related to your health or treatment.
