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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination penicillin-class antibiotic and beta-lactamase inhibitor. Piperacillin is a broad-spectrum, extended-spectrum penicillin antibiotic, and tazobactam is a beta-lactamase inhibitor that protects piperacillin from degradation by many bacterial beta-lactamase enzymes.
## Primary Indications
* Complicated intra-abdominal infections (cIAI)
* Community-acquired pneumonia (CAP)
* Nosocomial pneumonia (HAP)
* Complicated skin and skin-structure infections (cSSSI)
* Uncomplicated skin and skin-structure infections (uSSSI)
* Febrile neutropenia (empiric treatment)
* Complicated urinary tract infections (cUTI), including pyelonephritis
## Adult Dosing
Standard adult dose is 3.375 grams (piperacillin 3 g / tazobactam 0.375 g) or 4.5 grams (piperacillin 4 g / tazobactam 0.5 g) intravenously every 6 or 8 hours.
* **Complicated Intra-abdominal Infections:** 4.5 grams IV every 8 hours. Duration typically 4-7 days, depending on severity and pathogen.
* **Nosocomial Pneumonia:** 4.5 grams IV every 8 hours. Duration typically 7 days.
* **Febrile Neutropenia:** 4.5 grams IV every 8 hours. Duration typically 7 days or until resolution of neutropenia.
* **Other indications:** Dosing often 3.375 grams or 4.5 grams IV every 6 or 8 hours.
Duration of therapy is guided by clinical response, pathogen, and site of infection. Local protocols may dictate specific durations.
## Pediatric Dosing
Dosing is based on piperacillin component:
* **Patients 2 months and older:**
* **Complicated Intra-abdominal Infections, Community-Acquired Pneumonia, Skin and Skin Structure Infections:** 100 mg piperacillin per kg per dose IV every 8 hours.
* **Hospital-Acquired Pneumonia:** 125 mg piperacillin per kg per dose IV every 6 hours.
* **Maximum dose:** 4.5 grams per dose.
* **Duration:** Guided by clinical response, pathogen, and site of infection.
Note: Neonates and infants younger than 2 months are generally not recommended for this agent due to immature renal function; however, if used, dosing needs to be carefully adjusted and may be more frequent. Consult specific pediatric guidelines.
## Dose Adjustments
* **Renal Impairment (CrCl < 20 mL/min):** Reduce the frequency of administration. For standard regimens, a dose of 2.25 grams IV every 8 hours may be appropriate. For higher doses (4.5g q8h), consider 2.25 grams IV every 12 hours or 3.375 grams IV every 12 hours.
* **Hemodialysis:** Administer dose after dialysis. The dosing frequency and amount should be adjusted based on the patient's renal function.
Dose adjustments should be made based on the piperacillin component.
## Contraindications
* Known serious allergic reaction to piperacillin, other penicillins, other beta-lactam antibiotics (e.g., cephalosporins), or tazobactam.
## Adverse Effects
Common: Diarrhea, nausea, vomiting, rash, headache, insomnia, fever, injection site reactions.
Serious: *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures, neutropenia, thrombocytopenia, elevated liver enzymes, renal impairment.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam serum concentrations.
* **Neuromuscular blocking agents:** Piperacillin may prolong the action of vecuronium.
* **Warfarin:** May decrease the effect of warfarin. Monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance. Monitor methotrexate levels.
## Monitoring
* **Renal function:** Especially in patients with pre-existing renal impairment or those receiving other nephrotoxic agents.
* **Liver function:** Monitor for elevated transaminases.
* **Hematologic parameters:** Monitor complete blood count, particularly during prolonged therapy or in patients with renal impairment, for neutropenia or thrombocytopenia.
* **Signs of *Clostridioides difficile*-associated diarrhea:** Assess for and treat if diarrhea develops.
* **Clinical response:** Monitor for signs of clinical improvement.
## Clinical Pearls
* Piperacillin-tazobactam has broad-spectrum activity, including against many Gram-positive, Gram-negative (including *Pseudomonas aeruginosa*), and anaerobic bacteria.
* This agent is often used for empiric treatment of serious infections, particularly in healthcare-associated settings or when resistant organisms are suspected.
* Reconstituted solutions should be used within 24 hours when refrigerated or within 12 hours at room temperature.
* Ensure adequate hydration to minimize the risk of crystalluria.
* Discontinue if hypersensitivity reaction occurs.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional guidelines for complete details before making any clinical decisions.
