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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination penicillin-class antibiotic and beta-lactamase inhibitor. It has a broad spectrum of 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
* Hospital-acquired pneumonia (including ventilator-associated pneumonia)
* Febrile neutropenia (empiric treatment)
## Adult Dosing
Commonly administered as 3.375 g (piperacillin 3 g / tazobactam 0.375 g) or 4.5 g (piperacillin 4 g / tazobactam 0.5 g) IV every 6 to 8 hours. Dosing is often based on piperacillin content. Dosing frequency and duration depend on the indication, severity of infection, and patient response. For severe infections or those caused by less susceptible organisms, higher doses or more frequent administration may be considered.
## Pediatric Dosing
Dosing varies significantly by age and indication.
* **Patients 3 months and older:** Doses are typically expressed as piperacillin equivalents.
* Complicated intra-abdominal infections: 100 mg piperacillin/kg/dose IV every 8 hours.
* Febrile neutropenia: 100 mg piperacillin/kg/dose IV every 8 hours or 75 mg piperacillin/kg/dose IV every 6 hours.
* *Note:* Maximum dose per administration in pediatrics is generally 4 g piperacillin. Refer to institutional guidelines or specific pediatric infectious disease resources for precise dosing and frequency adjustments based on indication and weight.
## Dose Adjustments
* **Renal Impairment:** Adjust dose based on creatinine clearance (CrCl).
* CrCl > 40 mL/min: No adjustment needed.
* CrCl 20-40 mL/min: Administer usual dose every 8 hours.
* CrCl < 20 mL/min: Administer usual dose every 12 hours.
* *Note:* For intermittent hemodialysis, administer the dose after hemodialysis and adjust the frequency to every 12 hours on dialysis days.
* **Hepatic Impairment:** No dose adjustment is typically required.
## Contraindications
* Known severe hypersensitivity to piperacillin, tazobactam, other penicillinase-resistant penicillins, or beta-lactamase inhibitors.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, constipation.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (especially with high doses or renal impairment), neutropenia, thrombocytopenia, elevated liver enzymes, acute kidney injury.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum concentrations.
* **Neuromuscular blocking agents:** May prolong neuromuscular blockade.
* **Warfarin:** May decrease the effect of warfarin; increased monitoring of INR is recommended.
* **Methotrexate:** Piperacillin may reduce methotrexate clearance; monitor methotrexate levels.
## Monitoring
* Renal function (baseline and periodically during therapy, especially in patients with pre-existing renal impairment or those receiving nephrotoxic agents).
* Liver function tests.
* Complete blood count (especially prolonged therapy or in neutropenic patients).
* Signs and symptoms of infection for clinical response.
* Signs of hypersensitivity reactions.
* Monitor for diarrhea, especially *C. difficile*-associated diarrhea.
## Clinical Pearls
* The ratio of piperacillin to tazobactam is typically 8:1.
* Reconstituted solutions and infusions should be infused over at least 30 minutes to reduce the risk of hypersensitivity reactions.
* The maximum daily dose in adults is typically 18 g of piperacillin (16 g piperacillin, 2 g tazobactam) for severe infections.
* Piperacillin/tazobactam is active against *Pseudomonas aeruginosa*.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the official prescribing information and institutional protocols for complete details and to ensure the most up-to-date guidance for patient care.
