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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination antibiotic consisting of piperacillin, a broad-spectrum penicillinase-susceptible penicillin, and tazobactam, 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
* Hospital-acquired pneumonia (including ventilator-associated pneumonia)
* Febrile neutropenia (empiric treatment)
## Adult Dosing
* **Standard Dose:** 3.375 grams (3 g piperacillin / 0.375 g tazobactam) intravenously (IV) every 6 hours.
* **Higher Dose (for more severe infections or specific pathogens):** 4.5 grams (4 g piperacillin / 0.5 g tazobactam) IV every 6 or 8 hours.
* **Duration:** Typically 4-14 days, depending on the indication and clinical response.
* **Maximum Daily Dose:** Not explicitly defined but generally considered up to 18 g piperacillin/2.25 g tazobactam per day with administration every 6 hours.
## Pediatric Dosing
* **Neonates and Infants (< 12 months):** Dosing is complex and highly individualized based on gestational and postnatal age and weight, often requiring consultation with a pediatric infectious disease specialist or pharmacist. Typical piperacillin doses range from 75-100 mg/kg/day divided every 6-8 hours. Tazobactam is typically dosed at 1.875-2.5 mg/kg/dose every 6-8 hours.
* **Children (≥ 12 months):** 90-100 mg piperacillin/kg/day divided every 6 or 8 hours. Tazobactam is dosed at 1.875-2.5 mg/kg/dose every 6 or 8 hours.
* **Maximum Dose:** Generally, the pediatric dose should not exceed the maximum adult dose of 4.5 grams per dose.
## Dose Adjustments
* **Renal Impairment:**
* CrCl ≥ 40 mL/min: No adjustment needed.
* CrCl 20-39 mL/min: Administer usual dose every 8 hours.
* CrCl < 20 mL/min: Administer usual dose every 12 hours.
* Hemodialysis: Administer usual dose every 12 hours and supplement with an additional dose after each dialysis session.
* **Hepatic Impairment:** No dose adjustment generally recommended, but caution advised.
## Contraindications
* Known hypersensitivity to piperacillin, tazobactam, other penicillins, or beta-lactams.
* History of cholestatic jaundice or hepatic dysfunction associated with prior piperacillin/tazobactam use.
## Adverse Effects
* **Common:** Diarrhea, rash, nausea, vomiting, headache, insomnia, fever, pruritus.
* **Serious:** Hypersensitivity reactions (anaphylaxis), Clostridioides difficile-associated diarrhea, seizures (rare, particularly with high doses or renal impairment), interstitial nephritis, hematologic abnormalities (e.g., neutropenia, thrombocytopenia, eosinophilia), liver enzyme elevations.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum concentrations.
* **Neuromuscular Blocking Agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Warfarin:** May decrease the effect of warfarin; monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance; monitor methotrexate levels.
* **Aminoglycosides:** Avoid co-administration in vitro (physical or chemical incompatibility). If concurrent therapy is necessary, administer separately.
## Monitoring
* Monitor for signs and symptoms of hypersensitivity reactions.
* Monitor renal function (serum creatinine, BUN) and electrolytes, especially in patients with renal impairment or receiving concomitant nephrotoxic agents.
* Monitor for signs and symptoms of C. difficile infection.
* Monitor complete blood count (CBC) for hematologic abnormalities.
* Monitor liver function tests (LFTs).
* Assess clinical signs of infection for efficacy.
## Clinical Pearls
* Piperacillin/tazobactam has a broad spectrum of activity, including many resistant organisms like Pseudomonas aeruginosa.
* Ensure adequate hydration and monitor for signs of fluid overload, especially with higher doses.
* Reconstitute and dilute according to manufacturer instructions. Reconstituted solutions are generally stable for 24 hours at room temperature or 48 hours refrigerated.
* Dosing for febrile neutropenia should be initiated promptly upon diagnosis.
* The beta-lactamase inhibitor tazobactam protects piperacillin from degradation by many bacterial beta-lactamases.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional protocols before administering any medication. Dosing may vary based on patient-specific factors and clinical context.
