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# Piperacillin-Tazobactam
## Overview
Piperacillin is a broad-spectrum penicillin antibiotic, and tazobactam is a beta-lactamase inhibitor. This combination extends the spectrum of activity of piperacillin to include many beta-lactamase producing bacteria.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin-structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Febrile neutropenia (empiric treatment)
* Various other serious infections caused by susceptible organisms.
## Adult Dosing
Standard adult dosing is typically 3.375 grams (piperacillin 3 g / tazobactam 0.375 g) or 4.5 grams (piperacillin 4 g / tazobactam 0.5 g) intravenously every 6 or 8 hours. The choice of regimen depends on the severity of infection and local susceptibility patterns. For severe infections, doses may be increased or infused over a longer duration.
**Maximum daily dose:** Generally not to exceed 13.5 grams (piperacillin 12 g / tazobactam 1.5 g) per day.
**Infusion:** Typically infused over 30 minutes. Extended infusion over 4 hours may be used for some indications to achieve higher drug concentrations. Specific protocols should be consulted.
## Pediatric Dosing
Dosing is based on the piperacillin component.
* **For patients ≥ 2 months:** Dosing typically ranges from 100 mg/kg/day to 300 mg/kg/day of piperacillin, divided into every 6 or 8 hour doses, with a corresponding tazobactam dose. Total daily dose should not exceed the maximum adult dose.
* **Neonates and infants < 2 months:** Dosing is more complex and may be guided by pharmacokinetic data or specific institutional protocols, often based on weight and gestational age.
## Dose Adjustments
* **Renal Impairment:** Dose reduction and/or increased dosing interval is necessary for CrCl < 40 mL/min. Consult specific guidelines for exact adjustments.
* **Hepatic Impairment:** No specific dose adjustment is generally recommended, but caution is advised.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillin-class drugs, or any component of the formulation.
* History of immediate or severe allergic reaction to beta-lactam antibiotics.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, elevated liver enzymes.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (particularly at high doses or in renal impairment), neutropenia, thrombocytopenia, interstitial nephritis.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam serum concentrations.
* **Neuromuscular blocking agents:** May prolong the duration of neuromuscular blockade.
* **Warfarin:** May decrease the effect of warfarin; increased INR monitoring may be necessary.
* **Methotrexate:** Piperacillin-tazobactam may decrease methotrexate levels.
## Monitoring
* Renal function (creatinine, BUN)
* Liver function tests (AST, ALT)
* Complete blood count (especially for prolonged therapy)
* Signs and symptoms of hypersensitivity reactions
* Signs and symptoms of *C. difficile*-associated diarrhea
## Clinical Pearls
* Piperacillin-tazobactam has a broad spectrum, including many Gram-negative organisms (like *Pseudomonas aeruginosa*) and Gram-positive organisms, as well as anaerobic coverage.
* Resistance can emerge, especially from organisms producing extended-spectrum beta-lactamases (ESBLs) or carbapenemases. Susceptibility testing is crucial.
* Consider a shorter infusion time (30 minutes) for routine use, but extended infusion (4 hours) may be beneficial for critically ill patients or those with specific pathogens. Consult institutional protocols.
* Electrolyte imbalances may occur due to the sodium content.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional protocols for definitive guidance.*
