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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination extended-spectrum penicillin antibiotic and a beta-lactamase inhibitor. It provides coverage against Gram-positive, Gram-negative (including *Pseudomonas aeruginosa*), and anaerobic organisms.
## Primary Indications
* Moderate-to-severe community-acquired and hospital-acquired pneumonia.
* Intra-abdominal infections (e.g., appendicitis, peritonitis).
* Skin and skin structure infections.
* Postpartum endometritis or pelvic inflammatory disease.
* Empiric treatment of febrile neutropenia (often in combination with an aminoglycoside).
## Adult Dosing
* **Standard Dosing:** 3.375 g (3 g piperacillin/0.375 g tazobactam) IV every 6 hours.
* **Severe Infections (e.g., *Pseudomonas* or febrile neutropenia):** 4.5 g (4 g piperacillin/0.5 g tazobactam) IV every 6 hours.
* **Administration:** Typically infused over 4 hours (extended infusion) to optimize pharmacodynamics in critically ill patients, or over 30 minutes for standard use.
## Pediatric Dosing
* **General (Children ≥ 2 months):** 80–100 mg/kg (based on piperacillin component) IV every 6–8 hours.
* **Maximum Dose:** Not to exceed 4 g (piperacillin) per dose or 16 g/day.
* *Note: Always verify dose with local pediatric institutional guidelines, as dosing varies significantly by age, weight, and infection type.*
## Dose Adjustments
* **Renal Impairment:** Requires dosage adjustment based on Creatinine Clearance (CrCl). If CrCl ≤ 40 mL/min, refer to specific renal dosing charts (e.g., Lexicomp/UpToDate) for reductions in interval or dose.
* **Hemodialysis:** Requires supplemental dosing after dialysis (e.g., 0.75 g–2.25 g depending on specific patient factors).
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, or any other beta-lactam antibiotic (penicillins, cephalosporins, carbapenems).
* History of severe allergic reactions (anaphylaxis) to beta-lactams.
## Adverse Effects
* **Common:** Diarrhea, nausea, constipation, headache, insomnia.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (rash, anaphylaxis), neutropenia/leukopenia (with prolonged use), and elevated liver enzymes.
## Key Drug Interactions
* **Aminoglycosides:** May result in inactivation of the aminoglycoside; administer at least 1 hour apart.
* **Methotrexate:** May increase serum methotrexate levels; monitor levels closely.
* **Probenecid:** Increases serum concentrations of piperacillin/tazobactam; avoid concurrent use.
* **Warfarin:** May increase bleeding risk; monitor INR.
## Monitoring
* **Renal/Hepatic:** Periodic monitoring of BUN, serum creatinine, and LFTs, especially during prolonged therapy (>10 days).
* **Hematologic:** Monitor CBC for leukopenia, neutropenia, or thrombocytopenia.
* **Clinical:** Resolution of infection symptoms (fever, WBC count).
## Clinical Pearls
* **Extended Infusion:** In ICU settings, administering the dose over 3–4 hours is often preferred to keep serum concentrations above the minimum inhibitory concentration (MIC) for the duration of the dosing interval.
* **Cross-reactivity:** Use with extreme caution in patients with a history of severe penicillin allergy.
* **Sodium Content:** Contains 2.79 mEq (64 mg) of sodium per 1 gram of piperacillin, which may be clinically significant in patients with heart failure or severe hypertension.
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**Educational Disclaimer:** This information is for educational purposes only. Clinical practice is subject to change. Always verify specific dosing, safety precautions, and interactions using the most current institutional protocols and official prescribing information (package insert) before ordering or administering medications.
