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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 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
* Febrile neutropenia
## Adult Dosing
* **Standard dose:** 3.375 grams (3g piperacillin / 0.375g tazobactam) every 6 hours intravenously (IV).
* **Higher doses for severe infections or specific pathogens:** 4.5 grams (4g piperacillin / 0.5g tazobactam) every 6 or 8 hours IV.
* **Extended infusion:** 3.375 grams or 4.5 grams infused over 4 hours every 6 or 8 hours IV. This may increase time above the minimum inhibitory concentration (MIC).
## Pediatric Dosing
* **Children 0 to < 2 months:** Dosing is not well established and requires careful consideration of gestational and chronological age. Consult specialized pediatric infectious disease resources.
* **Children ≥ 2 months:** Dosing is typically based on piperacillin component:
* **Complicated intra-abdominal infections:** 100 mg/kg/dose (piperacillin component) infused over 30 minutes every 8 hours. Maximum dose 4 g piperacillin per dose.
* **Complicated skin and skin structure infections, community-acquired pneumonia, febrile neutropenia:** 75 mg/kg/dose (piperacillin component) infused over 30 minutes every 8 hours. Maximum dose 4 g piperacillin per dose.
* *Note:* Some guidelines may recommend 100 mg/kg/dose every 6 hours for severe infections. Always verify with local protocols or institutional guidelines.
## Dose Adjustments
* **Renal Impairment (CrCl ≥ 30 mL/min):** No dose adjustment necessary.
* **Renal Impairment (CrCl < 30 mL/min):**
* **Every 6-hour dosing:** 2.25 grams (2g piperacillin / 0.25g tazobactam) every 6 to 8 hours. For higher doses (4.5g q6h), consider 4.5 grams every 8 to 12 hours.
* **Every 8-hour dosing:** 3.375 grams (3g piperacillin / 0.375g tazobactam) every 8 to 12 hours.
* **Extended infusion:** Doses may need adjustment; consult specific guidelines.
* **Hemodialysis:** Administer 2.25 grams (2g piperacillin / 0.25g tazobactam) every 8 hours. Additional dose of 0.75 grams (0.5g piperacillin / 0.25g tazobactam) should be given after each dialysis session.
* **Hepatic Impairment:** No specific dose adjustments recommended.
## Contraindications
* Known severe hypersensitivity to piperacillin, tazobactam, other penicillins, or beta-lactamase inhibitors.
* History of cholestatic jaundice or hepatic dysfunction associated with piperacillin/tazobactam therapy.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, pruritus, headache, insomnia.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures, neutropenia, thrombocytopenia, increased 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 INR. Monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance. Monitor methotrexate levels.
## Monitoring
* Renal and hepatic function.
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of *C. difficile*-associated diarrhea.
* Complete blood count (CBC) with differential and platelet count, especially with prolonged therapy or in renal impairment.
## Clinical Pearls
* Piperacillin/tazobactam is a broad-spectrum agent frequently used for empiric therapy in serious bacterial infections, especially in hospitalized patients.
* The extended infusion (over 4 hours) can optimize pharmacokinetic/pharmacodynamic targets for susceptible organisms.
* Pseudomembranous colitis due to *Clostridioides difficile* can occur; consider this diagnosis if diarrhea develops during or after treatment.
* Careful dosing in renal impairment is crucial to avoid accumulation and increase risk of adverse effects.
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*This information is intended for healthcare professionals. Always consult the official prescribing information and relevant clinical guidelines for complete details before prescribing or administering any medication. Dosing may vary based on patient-specific factors and local institutional protocols.*
