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## Piperacillin/Tazobactam (Zosyn)
### Overview
Piperacillin/tazobactam is an extended-spectrum penicillin antibiotic combined with a beta-lactamase inhibitor. It is effective 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
### Adult Dosing
* **Standard Dose:** 3.375 grams (3g piperacillin/0.375g tazobactam) IV every 6 hours.
* **Higher Dose for Severe Infections:** 4.5 grams (4g piperacillin/0.5g tazobactam) IV every 6 or 8 hours. Dosing interval may be extended to every 8 hours for certain indications or with renal impairment.
* **Duration:** Typically 7 to 14 days, depending on infection severity and patient response.
### Pediatric Dosing
* **Children 2 months and older:** Dosing is based on piperacillin component.
* **2 months to < 2 years:** 90 mg piperacillin/11.25 mg tazobactam per kg per dose IV every 8 hours.
* **2 years to 12 years:** 90 mg piperacillin/11.25 mg tazobactam per kg per dose IV every 8 hours.
* **Maximum dose:** Not to exceed the adult dose of 4.5 grams per dose.
* **Note:** Dosing in neonates and infants < 2 months is complex and requires careful consideration of gestational and chronological age, and is often based on specific institutional protocols.
### Dose Adjustments
* **Renal Impairment (CrCl < 20 mL/min):**
* 3.375 g every 8 hours.
* 4.5 g every 12 hours.
* **CrCl 20-50 mL/min:** 3.375 g every 6 hours, or 4.5 g every 8 hours.
* **Hemodialysis:** Administer after hemodialysis session. Dose depends on CrCl, typically 2.25g or 3.375g every 8 hours. An additional dose may be needed after dialysis.
* **Hepatic Impairment:** No dose adjustment typically recommended.
### Contraindications
* Known history of severe allergic reaction to piperacillin, other penicillin antibiotics, or beta-lactamase inhibitors.
### Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, increased liver enzymes.
* **Serious:** Anaphylaxis, Clostridioides difficile-associated diarrhea (CDAD), seizures (particularly with high doses or renal impairment), neutropenia, thrombocytopenia.
### Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum concentrations.
* **Neuromuscular blocking agents:** May prolong neuromuscular blockade.
* **Warfarin:** May decrease INR; monitor INR closely.
* **Methotrexate:** May decrease methotrexate clearance; monitor methotrexate levels.
### Monitoring
* Renal function (BUN, creatinine).
* Liver function tests.
* Complete blood count (CBC), particularly for prolonged therapy.
* Electrolytes.
* Signs and symptoms of infection.
* Signs of hypersensitivity reactions.
* Stool for C. difficile if diarrhea develops.
### Clinical Pearls
* Reconstituted solutions should be used within 24 hours if refrigerated or within 1 hour if at room temperature (consult specific product labeling).
* Infusion time is typically 30 minutes for standard doses and 40 minutes for higher doses to reduce the risk of infusion-related reactions.
* The beta-lactamase inhibitor, tazobactam, does not have significant antibacterial activity on its own.
* Pseudomonas aeruginosa resistance can develop during therapy.
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*This information is intended for healthcare professionals. Always consult the official prescribing information and institutional guidelines for complete and up-to-date details before making clinical decisions.*
