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## Piperacillin/Tazobactam (Zosyn)
### Overview
Piperacillin/tazobactam is a combination antibiotic consisting of an extended-spectrum penicillin and 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 (3g piperacillin/0.375g tazobactam) IV every 6 hours.
* **Higher Dose (for severe infections or specific organisms):** 4.5 grams (4g piperacillin/0.5g tazobactam) IV every 6 or 8 hours.
* **Maximum Dose:** Typically 4.5 grams every 6 hours. Specific maximums may vary based on indication and susceptibility.
### Pediatric Dosing
* Dosing is based on piperacillin component. Consult specific institutional guidelines or pediatric infectious disease resources.
* **General Range:** 80 to 100 mg piperacillin component/kg/dose IV every 6 to 8 hours.
* **Maximum Dose:** Not to exceed 4 grams of piperacillin per dose in children and adolescents.
* **Neonates and Infants:** Dosing is highly variable and based on gestational and postnatal age.
### Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No dose adjustment needed.
* 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 and supplement with an additional dose (e.g., 2.25g) during or after each dialysis session.
* **Hepatic Impairment:** No dose adjustment is typically recommended.
### Contraindications
* Known hypersensitivity to piperacillin, tazobactam, other penicillins, or beta-lactam antibiotics.
* History of immediate and severe allergic reaction (anaphylaxis) to a penicillin or beta-lactam agent.
### Adverse Effects
* **Common:** Diarrhea, rash, nausea, vomiting, headache, insomnia, fever, eosinophilia, elevated liver enzymes.
* **Serious:** Hypersensitivity reactions (including anaphylaxis), Clostridioides difficile-associated diarrhea, seizures (especially with high doses or renal impairment), neutropenia, thrombocytopenia, interstitial nephritis.
### Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin serum levels.
* **Neuromuscular Blocking Agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Warfarin:** Piperacillin may decrease the anticoagulant effect of warfarin. Monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance. Monitor methotrexate levels.
* **Aminoglycosides:** While often used in combination, avoid co-administration in the same IV line due to potential inactivation of piperacillin. Separate administration.
### Monitoring
* **Renal function (SCr, eGFR)** for dose adjustments.
* **Liver function tests (LFTs)**.
* **Complete blood count (CBC)**, particularly for prolonged therapy, to monitor for hematologic changes.
* **Signs and symptoms of hypersensitivity reactions.**
* **Signs and symptoms of C. difficile infection.**
* **Therapeutic drug monitoring (TDM)** is generally not routinely required but may be considered in specific situations (e.g., critical illness, severe renal/hepatic dysfunction, suspected resistance).
### Clinical Pearls
* Piperacillin/tazobactam has broad-spectrum activity, including against many resistant organisms like *Pseudomonas aeruginosa*.
* Dosing frequency (every 6 or 8 hours) depends on the severity of infection and the pharmacokinetic/pharmacodynamic goals. Continuous or extended infusion strategies may be employed to optimize efficacy, especially for *Pseudomonas aeruginosa*.
* Ensure adequate hydration and monitor electrolytes, especially during prolonged IV infusions.
* Reconstituted solutions are typically stable for 24 hours at room temperature or 48 hours refrigerated, but always verify manufacturer recommendations.
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*Please verify current prescribing information and institutional protocols before administering any medication.*
