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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is an extended-spectrum penicillin antibiotic combined with a beta-lactamase inhibitor. It is active against a broad range of 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)
* Bacterial infections in febrile neutropenic patients (in combination with an aminoglycoside)
## Adult Dosing
Standard dose: 3.375 grams (3 grams piperacillin/0.375 grams tazobactam) intravenously every 6 hours.
High dose: 4.5 grams (4 grams piperacillin/0.5 grams tazobactam) intravenously every 6 or 8 hours for more severe infections or those involving resistant organisms like *Pseudomonas aeruginosa*.
Maximum daily dose is typically 18 grams (16 grams piperacillin/2 grams tazobactam).
## Pediatric Dosing
Dosing is based on piperacillin component:
* **1 month to 12 years:** 80-100 mg/kg/day of piperacillin, divided into 3 or 4 doses. The ratio of piperacillin to tazobactam is typically 8:1.
* **Children weighing > 50 kg:** Use adult dosing.
* **Children weighing ≤ 50 kg:** Use pediatric dosing.
* Maximum daily dose should not exceed the maximum adult dose.
* Dosing for neonates (<1 month) is less established and depends on gestational age and weight, often requiring individualized dosing and careful monitoring.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No adjustment needed.
* CrCl 20-40 mL/min: Administer 2.25 grams (2 grams piperacillin/0.25 grams tazobactam) or 3.375 grams (3 grams piperacillin/0.375 grams tazobactam) every 8 hours.
* CrCl < 20 mL/min: Administer 2.25 grams (2 grams piperacillin/0.25 grams tazobactam) or 3.375 grams (3 grams piperacillin/0.375 grams tazobactam) every 12 hours.
* Hemodialysis: Administer the recommended dose following dialysis and supplement with an additional 1/4 of the dose during dialysis.
* **Hepatic Impairment:** No specific dose adjustment recommended, but monitor closely.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillins, or beta-lactamase inhibitors.
* History of allergic reaction to cephalosporins or carbapenems.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, urticaria, headache, insomnia.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (especially with high doses or renal impairment), hematologic abnormalities (leukopenia, neutropenia, thrombocytopenia), interstitial nephritis, hepatotoxicity.
## Key Drug Interactions
* **Probenecid:** Decreases renal excretion of piperacillin/tazobactam, leading to increased and prolonged serum concentrations.
* **Neuromuscular blocking agents:** Piperacillin may prolong the action of vecuronium.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance. Monitor methotrexate levels.
* **Warfarin:** May decrease the effect of warfarin; monitor INR.
* **Aminoglycosides:** Potential for mutual inactivation of aminoglycosides and penicillins when administered together in vitro. However, they are often used synergistically in vivo for serious infections. Administer separately.
## Monitoring
* Renal function (CrCl) for dose adjustments.
* Liver function tests (LFTs) periodically.
* Complete blood count (CBC) for hematologic abnormalities, especially with prolonged therapy.
* Electrolytes.
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of *C. difficile*-associated diarrhea.
* Clinical response to therapy.
## Clinical Pearls
* Always reconstitute and dilute according to manufacturer instructions.
* Administer by slow intravenous infusion over at least 30 minutes.
* Avoid co-administration with solutions containing only bicarbonate.
* The ratio of piperacillin to tazobactam is fixed in commercial preparations (typically 8:1).
* Dose selection for severe infections or those due to less susceptible organisms may depend on local susceptibility patterns and institutional protocols.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the official prescribing information and your institution's guidelines for complete and up-to-date details before making clinical decisions.
