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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination of an extended-spectrum penicillin-class antibacterial (piperacillin) and a beta-lactamase inhibitor (tazobactam).
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Hospital-acquired pneumonia, including ventilator-associated pneumonia
## Adult Dosing
Standard dose is 3.375 grams every 6 hours or 4.5 grams every 6 or 8 hours, administered intravenously over 30 minutes.
* 3.375 g = 3 g piperacillin / 0.375 g tazobactam
* 4.5 g = 4 g piperacillin / 0.5 g tazobactam
Dosing frequency and duration depend on the indication, severity of infection, and patient response. For severe infections, higher doses may be used. Maximum daily dose of piperacillin is typically 18 grams.
## Pediatric Dosing
For children 2 months and older:
* Dosing is based on the piperacillin component.
* Usual dose: 90 to 100 mg piperacillin per kg per dose, administered intravenously every 6 or 8 hours.
* Maximum dose: 4.5 grams per dose.
* For children weighing > 40 kg, adult doses may be used.
* Dosing intervals should be adjusted in patients with impaired renal function.
## Dose Adjustments
**Renal Impairment:**
* CrCl > 40 mL/min: No dose adjustment needed.
* CrCl 20-40 mL/min: 2.25 g every 6 hours for 3.375 g regimen; 3.375 g every 6 hours for 4.5 g regimen.
* CrCl < 20 mL/min: 2.25 g every 8 hours for 3.375 g regimen; 2.25 g every 8 hours for 4.5 g regimen.
* Consider intermittent hemodialysis: Give dose after dialysis and adjust dose for interdialytic period.
**Hepatic Impairment:** No specific dose adjustment is generally recommended.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, or any component of the formulation.
* History of hypersensitivity to other beta-lactam antibacterials.
## Adverse Effects
* Diarrhea, nausea, vomiting, constipation
* Headache, insomnia
* Rash, pruritus, urticaria
* Elevated liver enzymes (AST, ALT)
* Hypokalemia
* Anaphylaxis, Stevens-Johnson syndrome (rare but serious)
* Clostridioides difficile-associated diarrhea
## Key Drug Interactions
* **Probenecid:** May increase piperacillin/tazobactam serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Warfarin:** Piperacillin may decrease the effect of warfarin; monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance; monitor methotrexate levels.
* **Bacteriostatic agents (e.g., tetracyclines, macrolides):** May antagonize the effect of penicillins.
## Monitoring
* Renal function (BUN, creatinine)
* Liver function tests (AST, ALT)
* Electrolytes (especially potassium)
* Signs and symptoms of infection (fever, white blood cell count, clinical improvement)
* Signs of hypersensitivity reactions
* INR if patient is on warfarin
## Clinical Pearls
* Piperacillin/tazobactam is a broad-spectrum agent often used empirically for serious infections, especially those suspected to be caused by resistant organisms.
* The beta-lactamase inhibitor tazobactam extends the spectrum of piperacillin to include many beta-lactamase producing organisms, including some strains of *Pseudomonas aeruginosa*.
* Renal dose adjustments are crucial.
* Discontinue if hypersensitivity reaction occurs.
* For patients with cystic fibrosis, higher doses and more frequent administration may be required. Dosing is often guided by therapeutic drug monitoring.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the official prescribing information and current guidelines for complete and up-to-date information before prescribing or administering any medication.*
