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## Piperacillin/Tazobactam (Zosyn)
### Overview
Piperacillin/tazobactam is a combination penicillin-class antibiotic and beta-lactamase inhibitor. It has broad-spectrum activity against many Gram-positive, Gram-negative (including *Pseudomonas aeruginosa*), 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)
* Empirical treatment of febrile neutropenia
* Other serious infections due to susceptible organisms
### Adult Dosing
* **Standard Dose:** 3.375 grams (piperacillin 3 grams / tazobactam 0.375 grams) IV every 6 hours.
* **Higher Dose:** 4.5 grams (piperacillin 4 grams / tazobactam 0.5 grams) IV every 6 or 8 hours. Higher doses are often used for severe infections, *Pseudomonas aeruginosa* infections, or in critically ill patients.
* **Maximum Dose:** Generally 18 grams per day (e.g., 4.5 grams every 6 hours). Dosing can be higher in specific situations (e.g., 12g piperacillin/1.5g tazobactam per day) with prolonged infusions. Consult institutional guidelines.
### Pediatric Dosing
* **Patients 0 to 12 months:** Dosing is weight-based and depends on the indication and severity of infection. Typically ranges from 80 mg piperacillin/10 mg tazobactam per kg per dose to 100 mg piperacillin/12.5 mg tazobactam per kg per dose IV every 6 or 8 hours. **Consult specific pediatric guidelines or drug references.**
* **Patients 1 to 12 years:** Dosing is weight-based and depends on the indication and severity of infection. Typically ranges from 80 mg piperacillin/10 mg tazobactam per kg per dose to 100 mg piperacillin/12.5 mg tazobactam per kg per dose IV every 6 or 8 hours. **Maximum dose should not exceed the adult dose.**
### Dose Adjustments
* **Renal Impairment:**
* CrCl ≥ 40 mL/min: No dose adjustment needed.
* CrCl 20-39 mL/min: Reduce dose by 25% or extend interval.
* CrCl < 20 mL/min: Reduce dose by 50% or extend interval.
* For patients on intermittent hemodialysis, give the usual recommended dose every 8 hours and administer an additional dose (e.g., 2.25 grams) after each dialysis session.
* **Hepatic Impairment:** No specific dose adjustment recommended.
### Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillinase-resistant penicillins, or any component of the formulation.
* History of immediate and severe allergic reaction to a beta-lactam antibiotic.
### Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, constipation, pruritus, fever.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), Stevens-Johnson syndrome/toxic epidermal necrolysis, interstitial nephritis, seizures (especially with renal impairment or high doses), hepatotoxicity, neutropenia, thrombocytopenia, Coombs' test positive hemolytic anemia.
### Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum levels.
* **Neuromuscular Blocking Agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Warfarin:** Piperacillin may decrease the effect of warfarin. Monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance. Monitor methotrexate levels.
* **Live Vaccines:** Live attenuated bacterial vaccines may be less effective if given concomitantly.
### Monitoring
* **Renal function:** Baseline and periodic monitoring, especially in patients with pre-existing renal disease or those receiving nephrotoxic agents.
* **Liver function tests:** Baseline and periodic monitoring, especially with prolonged therapy or in patients with liver disease.
* **Hematologic parameters:** Complete blood count, including platelet count, especially with prolonged therapy.
* **Signs and symptoms of infection:** Clinical response to therapy.
* **Signs and symptoms of hypersensitivity reactions:** Monitor closely during and after administration.
* **Signs and symptoms of *C. difficile* infection:** Diarrhea, abdominal cramping, fever.
### Clinical Pearls
* Piperacillin/tazobactam is often administered as a prolonged or continuous infusion, particularly for severe infections or *Pseudomonas* infections, to maintain higher drug concentrations. Consult institutional protocols for specific infusion strategies and dosing.
* Ensure adequate hydration and renal function to minimize the risk of seizures, which can occur with high doses and accumulation.
* Tazobactam is primarily a beta-lactamase inhibitor, extending the spectrum of piperacillin to include many beta-lactamase producing organisms.
* For empiric treatment of febrile neutropenia, piperacillin/tazobactam is often used in combination with an aminoglycoside or other agents, depending on local resistance patterns and patient risk factors.
***
*This information is intended for healthcare professionals. Always consult the current prescribing information and institutional guidelines for complete and up-to-date guidance.*
