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# Piperacillin/Tazobactam (Zosyn)
## Overview
Piperacillin/tazobactam is a combination of an extended-spectrum penicillin antibiotic and a beta-lactamase inhibitor.
## Primary Indications
Treatment of moderate to severe infections caused by piperacillin-susceptible organisms, including:
* Complicated intra-abdominal infections
* Complicated skin and skin-structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Febrile neutropenia
## Adult Dosing
* **Standard Dose:** 3.375 g (3 g piperacillin/0.375 g tazobactam) IV every 6 hours or 4.5 g (4 g piperacillin/0.5 g tazobactam) IV every 6 or 8 hours.
* **Higher Doses (e.g., for severe infections, hospital-acquired pneumonia, orPseudomonas infections):** Up to 4.5 g IV every 4 hours. **Note:** Higher doses require careful consideration of efficacy and toxicity, and specific institutional protocols should be followed.
* **Duration:** Typically 7 to 14 days, depending on the infection and clinical response.
## Pediatric Dosing
* **Children < 2 months:** Dosing is highly individualized and depends on gestational and postnatal age, weight, and severity of infection. Consult specialized pediatric guidelines.
* **Children ≥ 2 months:**
* **General:** 100 mg piperacillin/12.5 mg tazobactam per kg of body weight per dose, administered IV every 8 hours.
* **Complicated Intra-abdominal Infections:** 300 mg piperacillin/37.5 mg tazobactam per kg of body weight per dose, administered IV every 6 hours.
* **Maximum Dose:** Typically capped at the adult dose of 4.5 g per dose.
## Dose Adjustments
* **Renal Impairment (CrCl < 40 mL/min):**
* **3.375 g every 6 hours:** Reduce dose to 2.25 g every 6 hours.
* **4.5 g every 6 hours:** Reduce dose to 3.375 g every 6 hours.
* **4.5 g every 8 hours:** Reduce dose to 3.375 g every 8 hours.
* **Hemodialysis:** Administer dose after dialysis and supplement with an additional 0.75 g dose.
* **Hepatic Impairment:** No dose adjustment typically recommended, but caution is advised.
## Contraindications
* Known history of severe allergic reaction to piperacillin, tazobactam, other beta-lactam antibiotics, or other ingredients in the formulation.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, fever, phlebitis/thrombophlebitis.
* **Serious:** Hypersensitivity reactions (including anaphylaxis), C. difficile-associated diarrhea, seizure activity (especially with renal impairment or high doses), neutropenia, thrombocytopenia, eosinophilia, elevated liver enzymes, interstitial nephritis.
## 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 efficacy of warfarin. Monitor INR closely.
* **Aminoglycosides:** Concurrent use may lead to inactivation of piperacillin in vitro. Generally avoid coadministration in the same IV fluid.
## Monitoring
* **Renal function:** Monitor BUN and creatinine, especially in patients with pre-existing renal impairment or those receiving nephrotoxic agents.
* **Liver function:** Monitor LFTs periodically.
* **Hematologic parameters:** Monitor CBC, including differential and platelet count, especially with prolonged therapy.
* **Signs and symptoms of infection:** Clinical response to therapy.
* **Electrolytes:** Especially potassium, due to potential for hypokalemia.
* **Signs of hypersensitivity reactions.**
## Clinical Pearls
* Piperacillin/tazobactam has a broad spectrum of activity, including coverage for many Gram-positive, Gram-negative (including *Pseudomonas aeruginosa*), and anaerobic organisms.
* Reconstitution and dilution are required. Administer as a slow IV infusion over at least 30 minutes.
* The reconstituted solution should be used within 24 hours when refrigerated or within 12 hours at room temperature.
* Use with caution in patients with a history of penicillin allergy.
* Consider de-escalation to a narrower-spectrum agent once culture and sensitivity results are available and clinical improvement is observed.
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*This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the current prescribing information and relevant guidelines before administering any medication. Dosing and recommendations may vary based on patient-specific factors and local protocols.*
