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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination penicillin-class antibiotic with a beta-lactamase inhibitor. It is active against many Gram-positive and Gram-negative bacteria, including *Pseudomonas aeruginosa*.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Nosocomial intra-abdominal infections
## Adult Dosing
* **Standard Dose:** 3.375 grams (3g piperacillin/0.375g tazobactam) intravenously every 6 hours.
* **Higher Dose (e.g., for *Pseudomonas* or severe infections):** 4.5 grams (4g piperacillin/0.5g tazobactam) intravenously every 6 or 8 hours. Dosing frequency and duration depend on the indication and severity of infection, often guided by local protocols.
* **Maximum Daily Dose:** Typically 18 grams (16g piperacillin/2g tazobactam) per day, but can be higher in specific situations.
## Pediatric Dosing
Dosing varies significantly by age and weight, and is often calculated based on the piperacillin component.
* **Patients 12 years and older:** 3.375 grams or 4.5 grams IV every 6 or 8 hours, similar to adult dosing.
* **Patients 2 months to 12 years:** Dosing is typically based on piperacillin dose of 50 mg/kg to 100 mg/kg per dose, given every 6 or 8 hours. The tazobactam dose is typically 6.25 mg/kg to 12.5 mg/kg per dose. Total daily dose should not exceed the adult maximum.
* **Neonates and infants < 2 months:** Dosing is complex and usually based on piperacillin dose of 75 mg/kg to 100 mg/kg per dose given every 8 to 12 hours, with tazobactam dose of 1.875 mg/kg to 2.5 mg/kg per dose. Higher doses may be used for serious infections, especially those involving *Pseudomonas*. Specific protocols are essential.
## Dose Adjustments
* **Renal Impairment:** Dose reduction and/or increased dosing interval is required.
* CrCl > 40 mL/min: No adjustment needed.
* CrCl 20-40 mL/min: 2.25g or 3.375g IV every 8 hours.
* CrCl < 20 mL/min: 2.25g or 3.375g IV every 12 hours.
* Hemodialysis: Administer dose after dialysis and adjust frequency.
## Contraindications
* Known serious allergic reaction to piperacillin, other penicillin antibiotics, or beta-lactamase inhibitors.
## Adverse Effects
* **Common:** Diarrhea, rash, nausea, vomiting, headache, insomnia, fever, elevated liver enzymes.
* **Serious:** *Clostridioides difficile*-associated diarrhea (CDAD), hypersensitivity reactions (including anaphylaxis), seizures (rare, particularly with high doses or renal impairment), neutropenia, thrombocytopenia.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum levels.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the effect of vecuronium.
* **Warfarin:** Potential for reduced efficacy; monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance; monitor methotrexate levels.
## Monitoring
* Renal function
* Liver function tests
* Complete blood count (CBC) with differential
* Signs and symptoms of infection (clinical response)
* Signs and symptoms of hypersensitivity reactions
## Clinical Pearls
* Duration of therapy is typically 4-14 days and should be guided by clinical response and organism susceptibility.
* Reconstituted solution should be used within 24 hours when refrigerated or within 12 hours at room temperature.
* Use with caution in patients with a history of gastrointestinal disease, particularly colitis.
* Consider additive or synergistic effects when used with aminoglycosides, particularly for *Pseudomonas* infections. Ensure appropriate administration timing if given separately.
* Tazobactam inhibits many beta-lactamases but may not inhibit all, particularly extended-spectrum beta-lactamases (ESBLs) or carbapenemases. Susceptibility testing is crucial.
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**Disclaimer:** This information is intended for educational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional and refer to the most current prescribing information for any medication before use. Prescribing decisions should be based on individual patient needs and local guidelines.
