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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is an extended-spectrum penicillin antibiotic combined with a beta-lactamase inhibitor. It is active against many Gram-positive, Gram-negative, and anaerobic bacteria.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Febrile neutropenia (empiric treatment)
* Bacterial infections susceptible to piperacillin, especially those involving beta-lactamase producing organisms.
## Adult Dosing
* **Standard dose:** 3.375 grams (3g piperacillin/0.375g tazobactam) or 4.5 grams (4g piperacillin/0.5g tazobactam) intravenously (IV) every 6 or 8 hours.
* **Dosing frequency and duration:** Dosing frequency (q6h vs q8h) and total duration of therapy depend on the indication, severity of infection, and patient's clinical response. Refer to institutional guidelines or specific indications.
* **Maximum daily dose:** Generally not to exceed 18 grams per day (16g piperacillin/2g tazobactam) divided into doses every 6 or 8 hours.
## Pediatric Dosing
* **Children < 12 years:** Dosing varies by indication and weight.
* **Complicated intra-abdominal infections, complicated skin and skin structure infections, community-acquired pneumonia:** Typically 90-100 mg piperacillin/11.25-12.5 mg tazobactam per kg per dose IV every 8 hours.
* **Febrile neutropenia:** Typically 100 mg piperacillin/12.5 mg tazobactam per kg per dose IV every 8 hours.
* **Children ≥ 12 years:** Dosing is the same as adults (e.g., 3.375g or 4.5g IV q6h or q8h).
* **Maximum pediatric dose:** Refer to specific guidelines, but generally capped at adult maximums.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No dose adjustment necessary.
* CrCl 20-40 mL/min: Administer the usual dose every 8 hours.
* CrCl < 20 mL/min: Administer the usual dose every 12 hours.
* Consider intermittent hemodialysis: Administer the usual dose every 12 hours and administer an additional dose (e.g., 2.25g) after each dialysis session.
* **Hepatic Impairment:** No specific dosage adjustments are recommended.
## Contraindications
* Hypersensitivity to piperacillin, other penicillins, cephalosporins, beta-lactamase inhibitors, or any component of the formulation.
* History of immediate and severe allergic reaction (e.g., anaphylaxis) to a beta-lactam antibiotic.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, constipation, abdominal pain, fever.
* **Serious:** Hypersensitivity reactions (including anaphylaxis), Clostridioides difficile-associated diarrhea, seizures (especially with high doses or renal impairment), neutropenia, thrombocytopenia, liver enzyme elevations, interstitial nephritis.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the effect of vecuronium.
* **Warfarin:** Piperacillin may decrease the effect of warfarin; monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance; monitor methotrexate levels.
## Monitoring
* Signs and symptoms of infection, including fever, white blood cell count, and inflammatory markers.
* Renal function (BUN, creatinine) and electrolytes, especially in patients with renal impairment.
* Liver function tests.
* Signs of hypersensitivity reactions.
* For prolonged therapy: Monitor for hematologic effects (neutropenia, thrombocytopenia).
## Clinical Pearls
* Piperacillin/tazobactam has a broad spectrum of activity and is often a good choice for serious infections, particularly those suspected or confirmed to be caused by beta-lactamase producing organisms.
* Ensure adequate hydration and monitor for neurological symptoms, especially with high doses or in patients with renal impairment due to the risk of seizures.
* Discontinue if hypersensitivity reaction or C. difficile infection occurs.
* Reconstituted solutions should be used within the recommended time frame due to potential degradation.
**Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional guidelines before administering any medication.
