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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination antibiotic consisting of piperacillin, a broad-spectrum penicillin antibiotic, and tazobactam, a beta-lactamase inhibitor. This combination extends the spectrum of piperacillin to include many beta-lactamase-producing bacteria.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Febrile neutropenia
## Adult Dosing
Standard dosing is typically 3.375 g (3 g piperacillin/0.375 g tazobactam) or 4.5 g (4 g piperacillin/0.5 g tazobactam) intravenously every 6 or 8 hours. Dosing frequency and duration depend on the indication, severity of infection, and patient response. Maximum daily dose is generally 18 g. Specific dosing for certain indications, such as febrile neutropenia, may vary based on institutional protocols.
## Pediatric Dosing
Dosing in pediatric patients is based on piperacillin weight-based recommendations and varies by age and indication.
* **Intra-abdominal Infections:** 100 mg piperacillin/12.5 mg tazobactam per kg per dose administered every 6 hours.
* **Complicated Skin and Skin Structure Infections:** 75 mg piperacillin/9.375 mg tazobactam per kg per dose administered every 6 hours.
* **Neonates and Infants < 2 months:** Dosing is highly individualized and depends on gestational and postnatal age. Consult specialized pediatric guidelines.
Maximum pediatric dose should not exceed the maximum adult dose.
## Dose Adjustments
* **Renal Impairment:**
* CrCl ≥ 40 mL/min: No dose adjustment needed.
* CrCl 20-39 mL/min: Administer usual dose every 8 hours.
* CrCl < 20 mL/min: Administer usual dose every 12 hours.
* For doses > 4.5 g, consider reducing the frequency or the amount of each dose.
* **Hepatic Impairment:** No specific dose adjustment recommended, but caution is advised.
* **Hemodialysis:** Administer usual dose and supplement with an additional dose after each dialysis session.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillins, or beta-lactams.
* History of previous cholestatic jaundice/hepatic dysfunction associated with piperacillin/tazobactam therapy.
## Adverse Effects
Common adverse effects include diarrhea, nausea, vomiting, rash, headache, insomnia, constipation, and phlebitis at the injection site. Serious adverse effects may include Clostridioides difficile-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures, and hematologic changes (e.g., neutropenia, thrombocytopenia).
## Key Drug Interactions
* **Probenecid:** Increases and prolongs piperacillin/tazobactam plasma concentrations.
* **Aminoglycosides:** Potential for decreased efficacy when used concurrently. However, combination therapy may be beneficial in severe infections; monitor drug levels.
* **Warfarin:** May decrease the effect of warfarin. Monitor INR closely.
* **Methotrexate:** May decrease methotrexate clearance. Monitor methotrexate levels.
* **Neuromuscular Blocking Agents:** May prolong the duration of neuromuscular blockade.
## Monitoring
* Renal and hepatic function.
* Electrolytes, especially in patients with impaired renal function or receiving diuretics.
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of C. difficile infection.
* Complete blood counts, particularly in patients with prolonged therapy.
* Culture and sensitivity testing to guide therapy.
## Clinical Pearls
* Piperacillin/tazobactam covers a wide range of gram-positive, gram-negative, and anaerobic organisms, including many resistant strains.
* Ensure adequate hydration to minimize risk of crystalluria.
* Reconstituted solution should be used within specified timeframes and refrigerated if not used immediately.
* Dosing for febrile neutropenia may require higher doses and specific durations based on institutional guidelines.
* Always consider local antimicrobial resistance patterns when selecting therapy.
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**Disclaimer:** This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information and relevant clinical guidelines for complete details on indications, contraindications, warnings, precautions, adverse reactions, and dosing.
