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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination penicillin-class antibacterial and a beta-lactamase inhibitor. It is active against a broad spectrum of 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)
* Bacterial meningitis (in some regions, depending on susceptibility patterns)
* Febrile neutropenia (empiric treatment)
## Adult Dosing
* **Standard Dose:** 3.375 grams every 6 hours or 4.5 grams every 8 hours intravenously (IV). Each dose contains 3 grams of piperacillin and 0.375 grams of tazobactam or 4 grams of piperacillin and 0.5 grams of tazobactam, respectively.
* **Severe Infections/Higher Susceptibility Organisms:** Doses up to 4.5 grams every 4 hours IV may be used.
* **Maximum Dose:** Typically not to exceed 18 grams per day (e.g., 4.5 grams every 4 hours). Exact maximums may vary by indication and local guidelines.
## Pediatric Dosing
Dosing is based on the piperacillin component and is highly dependent on indication, age, weight, and severity of illness. Renal function is a critical consideration. Refer to institutional guidelines or specialized pediatric resources.
* **General Range (Pediatric patients \>= 2 months):** 75 mg/kg to 100 mg/kg of piperacillin component every 6 or 8 hours IV.
* **Maximum Dose:** Generally not to exceed the adult maximum of 4 grams of piperacillin per dose.
## Dose Adjustments
* **Renal Impairment:**
* CrCl 20-40 mL/min: Reduce dose by 25%. Administer every 8 hours (instead of every 6 hours) or every 12 hours (instead of every 8 hours), depending on the original dosing interval.
* CrCl < 20 mL/min: Reduce dose by 50%. Administer every 8 hours (instead of every 6 hours) or every 12 hours (instead of every 8 hours), depending on the original dosing interval.
* Hemodialysis: Administer dose after dialysis and supplement with an additional dose equivalent to 1/4 of the standard daily dose.
* **Hepatic Impairment:** No specific dose adjustment is typically required, but caution is advised.
## Contraindications
* Known history of severe allergic reaction to piperacillin, tazobactam, other penicillin, or beta-lactamase inhibitors.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, pruritus, headache, insomnia, thrombocytosis, eosinophilia, hypokalemia.
* **Serious:** *Clostridioides difficile*-associated diarrhea (CDAD), hypersensitivity reactions (including anaphylaxis), seizures (especially with high doses or renal impairment), neutropenia, leukopenia, interstitial nephritis, liver dysfunction.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam serum concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** May prolong the neuromuscular blockade.
* **Warfarin:** Monitor INR closely, as penicillins may decrease INR.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance. Monitor methotrexate levels.
## Monitoring
* Renal function (CrCl)
* Electrolytes (especially potassium)
* Liver function tests
* Complete blood count (CBC)
* Signs and symptoms of infection and improvement
* Signs and symptoms of hypersensitivity reactions
* Stool for *C. difficile* if diarrhea occurs
## Clinical Pearls
* Piperacillin-tazobactam is a broad-spectrum agent often reserved for moderate to severe infections, hospital-acquired infections, or when beta-lactamase producing organisms are suspected.
* The reconstituted solution must be administered intravenously. Infusion rates are crucial to minimize infusion-related reactions. Administer over at least 30 minutes for doses up to 4.5 grams. Longer infusion times may be preferred for higher doses or continuous infusions.
* Hypokalemia can occur, especially with prolonged use or concurrent diuretic therapy.
* Be aware of potential for seizures, particularly in patients with renal impairment.
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**Disclaimer:** This information is intended for healthcare professionals and is a summary of key points. It is not exhaustive. Always consult the most current prescribing information, institutional protocols, and perform your own independent verification before making clinical decisions.
