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# Tazobactam/Piperacillin
## Overview
Tazobactam/piperacillin is a combination penicillin-class antibiotic with broad-spectrum activity against various gram-positive, gram-negative, and anaerobic bacteria. Tazobactam is a beta-lactamase inhibitor that protects piperacillin from degradation by many bacterial beta-lactamases.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin-structure infections
* Community-acquired pneumonia
* Hospital-acquired pneumonia
* Febrile neutropenia (empiric treatment)
## Adult Dosing
* **Standard Dose:** 3.375 grams (3 grams piperacillin and 0.375 grams tazobactam) every 6 hours intravenously (IV).
* **Severe Infections/Higher Inoculums:** 4.5 grams (4 grams piperacillin and 0.5 grams tazobactam) every 6 hours IV.
* **Maximum Daily Dose:** 13.5 grams (12 grams piperacillin and 1.5 grams tazobactam) every 6 hours infusion.
* **Duration:** Typically 7-14 days, depending on severity and indication. Longer durations may be needed for febrile neutropenia.
## Pediatric Dosing
* **Children less than 12 years:** Dosing varies significantly by indication and weight. Refer to specific pediatric guidelines or institutional protocols. A common regimen for infections is 100 mg piperacillin per kg per dose plus 12.5 mg tazobactam per kg per dose every 6 hours. Maximum dose should not exceed the adult maximum.
* **Children 12 years and older:** May be dosed as adults.
## Dose Adjustments
* **Renal Impairment (CrCl < 20 mL/min):**
* 3.375 g every 8 hours.
* 4.5 g every 8-12 hours.
* **Hepatic Impairment:** No specific dose adjustment recommended, but caution advised due to potential for decreased clearance.
## Contraindications
* Known serious hypersensitivity to piperacillin, tazobactam, or beta-lactam antibiotics.
## Adverse Effects
* Diarrhea (common)
* Nausea, vomiting
* Rash
* Pruritus
* Headache
* Insomnia
* Fever
* Anaphylaxis (rare but serious)
* Clostridium difficile-associated diarrhea
* Seizures (especially with high doses or renal impairment)
* Elevated liver enzymes
## Key Drug Interactions
* **Probenecid:** May increase serum concentrations of piperacillin/tazobactam.
* **Warfarin:** May decrease the effect of warfarin, leading to increased INR. Monitor INR closely.
* **Neuromuscular Blocking Agents (e.g., vecuronium):** May prolong neuromuscular blockade.
* **Methotrexate:** May decrease methotrexate levels. Monitor methotrexate levels.
## Monitoring
* Renal function (especially in patients with pre-existing renal disease or receiving nephrotoxic agents).
* Liver function tests.
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of C. difficile infection.
* Therapeutic response.
## Clinical Pearls
* Administer as an IV infusion over at least 30 minutes (for 3.375g or 4.5g doses). Longer infusion times may be preferred in critically ill patients or those with renal impairment.
* Reconstitution and dilution instructions must be followed carefully.
* Consider local antimicrobial susceptibility patterns when initiating therapy.
* Discontinue immediately if hypersensitivity reaction occurs.
* Monitor electrolytes, especially during prolonged therapy, due to potential for hypokalemia.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information, institutional protocols, and patient-specific factors before making any clinical decisions.
