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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination antibiotic consisting of a penicillinase-resistant penicillin (piperacillin) and a beta-lactamase inhibitor (tazobactam). It exhibits broad-spectrum activity against many 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
* Febrile neutropenia (empiric treatment)
## Adult Dosing
The typical dose is 3.375 grams (3g piperacillin/0.375g tazobactam) or 4.5 grams (4g piperacillin/0.5g tazobactam) intravenously every 6 or 8 hours. Dosing frequency and duration are dependent on the severity of infection and clinical response. Maximum daily dose is typically 18 grams. Specific dosing for febrile neutropenia may vary based on local protocols.
## Pediatric Dosing
Dosing is based on piperacillin content.
* **1 month to <12 years:** 240 mg/kg/day piperacillin, divided every 6 to 8 hours. Do not exceed the adult maximum dose of 18 g/day.
* **≥12 years:** Same as adult dosing.
Dosing for neonates and infants <1 month is highly variable and requires careful consideration of gestational and postnatal age, weight, and renal/hepatic function, often guided by specialist recommendations or local protocols.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No dose adjustment needed.
* CrCl 20-40 mL/min: Reduce dose by 25% or increase interval to every 8 hours.
* CrCl < 20 mL/min: Reduce dose by 50% or increase interval to every 8 hours.
* Hemodialysis: Administer dose after hemodialysis and supplement with 0.75g every 8 hours if CrCl < 20 mL/min.
* **Hepatic Impairment:** No dose adjustment is typically required.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillins, or beta-lactams.
* History of cholestatic jaundice or hepatic dysfunction associated with piperacillin/tazobactam.
## Adverse Effects
Common adverse effects include diarrhea, nausea, vomiting, rash, headache, insomnia, and elevated liver enzymes. Serious adverse effects can include hypersensitivity reactions (anaphylaxis), C. difficile-associated diarrhea, seizures (especially with high doses or renal impairment), and hematologic changes (thrombocytopenia, neutropenia).
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam serum concentrations.
* **Neuromuscular blocking agents:** May prolong the neuromuscular blockade.
* **Warfarin:** Monitor INR closely; potential for reduced efficacy of warfarin.
* **Methotrexate:** May decrease methotrexate levels; monitor methotrexate levels.
## Monitoring
* Renal and hepatic function.
* Electrolytes.
* Signs and symptoms of infection.
* Culture and sensitivity results.
* For prolonged therapy, monitor complete blood count and coagulation parameters.
## Clinical Pearls
* Administer by slow intravenous infusion over at least 30 minutes.
* Reconstituted solutions are stable for a limited time; consult manufacturer's labeling for specific reconstitution and storage instructions.
* The beta-lactamase inhibitor tazobactam broadens the spectrum of piperacillin to include many beta-lactamase-producing organisms.
* Consider de-escalation once culture and sensitivity results are available.
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*Disclaimer: This information is intended for clinical use and does not substitute for comprehensive drug information resources. Always verify current prescribing information with the manufacturer's product labeling or other authoritative sources before making clinical decisions.*
