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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination antibiotic consisting of a broad-spectrum penicillin-class antibacterial (piperacillin) and a beta-lactamase inhibitor (tazobactam). It is bactericidal and inhibits bacterial cell wall synthesis.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin-structure infections (including diabetic foot infections)
* Community-acquired pneumonia
* Nosocomial pneumonia
* Febrile neutropenia (empiric treatment)
* Bacterial meningitis (certain pathogens)
* Gynecologic infections
## Adult Dosing
Dosing is typically based on the piperacillin component. Standard doses include:
* **3.375 g IV every 6 hours** (2.8 g piperacillin / 0.57 g tazobactam)
* **4.5 g IV every 6 or 8 hours** (4 g piperacillin / 0.5 g tazobactam)
Duration of therapy varies based on indication and patient response, typically 7-14 days. Dosing and frequency for severe infections or those caused by less susceptible organisms may require higher doses or more frequent administration, as per local protocol.
## Pediatric Dosing
Dosing is typically based on the piperacillin component per kg of body weight.
* **Children < 12 years:** 100 mg piperacillin/kg/dose IV every 8 hours. Total daily dose should not exceed 16 g piperacillin.
* **Children ≥ 12 years:** Same as adult dosing.
Note: For children weighing < 40 kg, a reconstituted dosing volume needs careful calculation.
## Dose Adjustments
* **Renal Impairment (CrCl < 20 mL/min):** Reduce dose frequency or amount, as per local protocol or pharmacist recommendation. Typically, administer the usual dose every 12 hours.
* **Hepatic Impairment:** No specific dose adjustment is generally recommended, but caution is advised.
## Contraindications
* Known severe hypersensitivity to piperacillin, tazobactam, other penicillins, or beta-lactam antibiotics.
## Adverse Effects
Common: Diarrhea, nausea, vomiting, rash, injection site reactions, headache, insomnia.
Serious: *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (especially with high doses or renal impairment), neutropenia, thrombocytopenia, elevated liver enzymes.
## 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 anticoagulant effect of warfarin. Monitor INR closely.
* **Methotrexate:** Penicillins may decrease methotrexate clearance, leading to increased toxicity.
## Monitoring
* Renal and hepatic function.
* Electrolytes, especially with prolonged therapy or diuretic use.
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of *C. difficile* infection.
* Complete blood count (CBC) with differential and platelet count if therapy is prolonged or in patients with underlying hematologic conditions.
## Clinical Pearls
* Piperacillin/tazobactam is a broad-spectrum agent often used for empiric therapy of serious infections.
* Reconstitute and dilute according to manufacturer guidelines. Infuse over at least 30 minutes to reduce infusion-related reactions.
* For patients with renal impairment, adjust dose or frequency to avoid accumulation and potential neurotoxicity.
* Discontinue if allergic reaction occurs.
* Consider de-escalation once culture and sensitivity results are available.
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*Disclaimer: This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information, institutional guidelines, and a qualified healthcare provider for any questions regarding patient care.*
