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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination of an extended-spectrum penicillin antibiotic (piperacillin) and a beta-lactamase inhibitor (tazobactam). It is bactericidal and 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
The typical dose is 3.375 grams (piperacillin 3g/tazobactam 0.375g) every 6 hours intravenously.
Doses of 4.5 grams (piperacillin 4g/tazobactam 0.5g) every 6 or 8 hours intravenously may be used for more severe infections or those caused by less susceptible organisms, per institutional guidelines.
Maximum daily dose is typically 18 grams (piperacillin 16g/tazobactam 2g) given as 4.5g every 6 hours.
## Pediatric Dosing
Dosing varies by indication and patient weight.
* **Complicated intra-abdominal infections:** 90-100 mg piperacillin per kg per dose IV every 6 hours.
* **Complicated skin and skin structure infections:** 90-100 mg piperacillin per kg per dose IV every 6 hours.
* **Pediatric patients weighing >40 kg:** Use adult dosing.
*Note: Pediatric dosing is complex and requires careful calculation based on weight and indication. Consult specific pediatric guidelines or institutional protocols.*
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No adjustment needed.
* CrCl 20-40 mL/min: Give usual dose every 8 hours.
* CrCl < 20 mL/min: Give usual dose every 12 hours.
* For intermittent hemodialysis or continuous venovenous hemofiltration (CVVH): Give usual dose every 12 hours and administer an additional dose after each dialysis session.
* **Hepatic Impairment:** No dose adjustment is typically required.
## Contraindications
* Known history of severe allergic reaction to piperacillin, tazobactam, or other beta-lactam antibiotics.
## Adverse Effects
* **Common:** Diarrhea, rash, nausea, vomiting, headache, insomnia, eosinophilia, elevated liver enzymes (AST, ALT).
* **Serious:** *Clostridioides difficile*-associated diarrhea (CDAD), hypersensitivity reactions (including anaphylaxis), seizures (rare, especially with high doses or renal impairment), neutropenia, thrombocytopenia, acute kidney injury.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam serum levels.
* **Neuromuscular blocking agents:** Piperacillin may prolong the action of vecuronium.
* **Warfarin:** May decrease the effect of warfarin; monitor INR closely.
* **Methotrexate:** May decrease methotrexate clearance; monitor methotrexate levels.
## Monitoring
* Renal function (especially in patients with pre-existing renal disease or those receiving nephrotoxic agents).
* Liver function tests.
* Complete blood count (CBC) with differential, especially for prolonged treatment courses.
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of *C. difficile*-associated diarrhea.
## Clinical Pearls
* Administer over at least 30 minutes to reduce the risk of infusion-related reactions.
* The presence of tazobactam broadens the spectrum to include many beta-lactamase producing organisms that are resistant to piperacillin alone.
* Consider local antibiograms for optimal selection in specific infections.
* Discontinue if hypersensitivity reactions or severe diarrhea occur.
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*This information is for educational purposes only and does not substitute for professional medical advice. Always consult the current prescribing information and institutional protocols for complete and up-to-date guidance.*
