Please check your internet connection and try again.
# Piperacillin/Tazobactam
## Overview
Piperacillin is a broad-spectrum penicillin antibiotic. Tazobactam is a beta-lactamase inhibitor that protects piperacillin from degradation by many bacterial beta-lactamase enzymes, thereby extending its spectrum of activity.
## Primary Indications
Piperacillin/tazobactam is indicated for the treatment of moderate to severe infections caused by piperacillin-susceptible organisms, including:
* Intra-abdominal infections
* Complicated urinary tract infections (including pyelonephritis)
* Pneumonia (hospital-acquired and community-acquired)
* Skin and skin structure infections
* Bacterial meningitis
* Sepsis
It is often used empirically to cover a broad range of common pathogens, including Gram-positive, Gram-negative (including *Pseudomonas aeruginosa*), and anaerobic bacteria.
## Adult Dosing
Common adult doses are:
* 3.375 grams (piperacillin 3 grams / tazobactam 0.375 grams) intravenously every 6 hours.
* 4.5 grams (piperacillin 4 grams / tazobactam 0.5 grams) intravenously every 6 or 8 hours.
The maximum daily dose is typically 18 grams (piperacillin 16 grams / tazobactam 2 grams). Dosing frequency and duration depend on the severity of illness, pathogen susceptibility, and clinical response. For severe *Pseudomonas aeruginosa* infections, doses of 4.5 grams every 6 or 8 hours are often used.
## Pediatric Dosing
Pediatric dosing is based on piperacillin weight. Dosing varies by indication and age:
* **Children 2 months and older:**
* **Intra-abdominal infections:** 100 mg piperacillin/kg/dose administered every 8 hours.
* **Other infections (e.g., UTIs, skin infections, pneumonia):** 75 mg piperacillin/kg/dose administered every 6 hours.
* **Maximum dose:** Do not exceed the maximum adult dose of 4.5 grams per dose and 18 grams per day.
* **Neonates and infants younger than 2 months:** Dosing is not well established and should be determined by clinical judgment and local protocols.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 40 mL/min: No dose adjustment.
* CrCl 20-40 mL/min: 2.25 grams (piperacillin 2g/tazobactam 0.25g) every 6 hours or 3.375 grams (piperacillin 3g/tazobactam 0.375g) every 8 hours.
* CrCl < 20 mL/min: 2.25 grams (piperacillin 2g/tazobactam 0.25g) every 8 hours.
* Hemodialysis: Give a dose after each dialysis session.
* **Hepatic Impairment:** No dose adjustment is typically needed.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, or any component of the formulation.
* History of a severe allergic reaction to penicillins, cephalosporins, or beta-lactamase inhibitors.
## Adverse Effects
Common adverse effects include diarrhea, nausea, vomiting, rash, headache, insomnia, and liver function test abnormalities.
Serious adverse effects may include:
* Hypersensitivity reactions (anaphylaxis)
* Clostridioides difficile-associated diarrhea
* Seizures (especially with high doses or renal impairment)
* Hematologic changes (e.g., neutropenia, thrombocytopenia)
* Hepatotoxicity
* Interstitial nephritis
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam plasma concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the action of vecuronium. Monitor for recurrence of neuromuscular blockade.
* **Warfarin:** May decrease the effect of warfarin; monitor INR closely.
* **Methotrexate:** May decrease methotrexate clearance; monitor methotrexate levels.
* **Aminoglycosides:** Concurrent administration can lead to physical or chemical inactivation. Administer separately.
## Monitoring
* **Renal function:** For dose adjustments.
* **Liver function tests:** Baseline and periodically, especially in patients with pre-existing liver disease.
* **Complete blood count:** Monitor for hematologic abnormalities.
* **Signs and symptoms of infection:** Clinical response to therapy.
* **Signs of hypersensitivity reactions:** Monitor during and after administration.
* **Electrolytes:** Especially in patients with renal impairment.
## Clinical Pearls
* Piperacillin/tazobactam has a broad spectrum of activity, making it a good choice for empirical therapy, especially in critically ill patients or when *Pseudomonas aeruginosa* is suspected.
* Dosing adjustments for renal impairment are crucial.
* Caution is advised in patients with a history of allergy to beta-lactam antibiotics.
* Administer intravenously over at least 30 minutes. Faster infusions may increase the risk of hypersensitivity reactions.
* For patients with severe *Pseudomonas aeruginosa* infections, consider extending the infusion time (e.g., 4-hour continuous infusion) for improved efficacy. This requires specific protocols.
***
*This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional guidelines for complete details and to confirm dosages and recommendations.*
