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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is an extended-spectrum penicillin-class antibacterial combined with a beta-lactamase inhibitor. It is active against many Gram-positive, Gram-negative, and anaerobic bacteria, including *Pseudomonas aeruginosa*.
## 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
Dosing is typically based on the piperacillin component. Common regimens include:
* **3.375 g IV every 6 hours** or **4.5 g IV every 6 or 8 hours**.
* **Doses up to 4.5 g IV every 4 hours** may be used for severe infections or those caused by *Pseudomonas aeruginosa*.
* **Maximum daily dose:** 18 g (piperacillin component).
Duration of therapy depends on the indication and clinical response, typically 7-14 days.
## Pediatric Dosing
Dosing varies by age and indication. For serious infections in patients 3 months and older:
* **3.375 g/kg IV every 6 hours** or **4.5 g/kg IV every 8 hours**, not to exceed the adult maximum of 4.5 g per dose.
* For *Pseudomonas aeruginosa* infections, higher doses (e.g., 4.5 g/kg/dose) may be considered.
Refer to specific pediatric guidelines for detailed dosing by indication.
## Dose Adjustments
* **Renal Impairment:** Adjust dose based on calculated creatinine clearance (CrCl).
* CrCl 20-40 mL/min: Administer usual dose every 8 hours.
* CrCl < 20 mL/min: Administer usual dose every 12 hours.
* Hemodialysis: Administer usual dose every 8 hours, with an additional dose after each dialysis session.
* **Hepatic Impairment:** No dose adjustment generally required.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, or other beta-lactam antibiotics.
* History of immediate and severe allergic reaction to penicillin or cephalosporins.
## Adverse Effects
* Diarrhea
* Nausea/Vomiting
* Rash
* Pruritus
* Headache
* Insomnia
* Fever
* Thrombocytopenia, leukopenia, neutropenia (rare with short courses)
* *Clostridioides difficile*-associated diarrhea
* Seizures (rare, especially with high doses or renal impairment)
* Anaphylaxis
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum concentrations.
* **Neuromuscular blocking agents:** Piperacillin may prolong the blockade.
* **Warfarin:** May decrease the effect of warfarin; increased monitoring of INR is recommended.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance; increased methotrexate toxicity is possible.
## Monitoring
* Renal function (baseline and periodically, especially with concurrent nephrotoxic agents).
* Liver function tests.
* Complete blood counts.
* Electrolytes.
* Signs and symptoms of infection.
* Signs and symptoms of hypersensitivity reactions.
## Clinical Pearls
* Reconstituted solutions should be used within 24 hours if refrigerated or within 12 hours at room temperature.
* Dilute to a final concentration of 1-5 mg piperacillin/mL.
* Avoid co-administration with bacteriostatic agents, as it may theoretically reduce activity.
* Piperacillin can cause a false-positive direct Coombs test.
* Dosing for specific complex scenarios (e.g., cystic fibrosis, burn patients, severe sepsis) may require higher doses or more frequent administration based on institutional protocols and patient-specific factors.
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*This information is intended for clinical use and does not replace comprehensive prescribing information. Always consult the official product labeling and institutional protocols for the most current and detailed guidance.*
