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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination of a penicillin-class antibiotic and a beta-lactamase inhibitor, providing 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 (including ventilator-associated pneumonia)
* Nosocomial infections caused by susceptible organisms
## Adult Dosing
Standard dose: 3.375 grams (3g piperacillin/0.375g tazobactam) intravenously every 6 hours.
Alternatively, 4.5 grams (4g piperacillin/0.5g tazobactam) intravenously every 6 or 8 hours.
Dosing frequency and duration depend on the severity and type of infection, as well as the patient's clinical response.
Maximum daily dose is typically 18 grams (16g piperacillin/2g tazobactam).
## Pediatric Dosing
For patients 2 months of age and older:
* **Complicated intra-abdominal infections:** 100 mg piperacillin/12.5 mg tazobactam per kg per dose intravenously every 8 hours.
* **Hospital-acquired pneumonia:** 100 mg piperacillin/12.5 mg tazobactam per kg per dose intravenously every 8 hours.
* **Neutropenic patients (off-label use):** Some guidelines suggest doses up to 300 mg piperacillin/37.5 mg tazobactam per kg per day divided every 6 hours.
* **Maximum dose:** 4.5 grams per dose.
* **Note:** Dosing should not exceed the adult maximum. Consult institutional guidelines for specific pediatric protocols.
## Dose Adjustments
* **Renal Impairment:**
* CrCl ≥ 40 mL/min: No dose adjustment needed.
* CrCl 20-39 mL/min: Give standard dose every 8 hours.
* CrCl < 20 mL/min: Give standard dose every 12 hours.
* Hemodialysis: Give standard dose every 12 hours and administer an additional dose of 2.25g (2g piperacillin/0.25g tazobactam) after each dialysis session.
* **Hepatic Impairment:** No dose adjustment is generally required, but caution is advised in severe hepatic dysfunction.
## Contraindications
* Known history of hypersensitivity to piperacillin, tazobactam, other beta-lactam antibiotics, or any component of the formulation.
## Adverse Effects
* **Common:** Diarrhea, rash, nausea, vomiting, headache, insomnia, constipation, abdominal pain, pruritus, fever.
* **Serious:**
* Hypersensitivity reactions (anaphylaxis)
* Clostridioides difficile-associated diarrhea (CDAD)
* Seizures (especially with high doses or renal impairment)
* Hepatotoxicity
* Hematologic abnormalities (e.g., neutropenia, thrombocytopenia)
* Interstitial nephritis
## Key Drug Interactions
* **Probenecid:** May increase piperacillin/tazobactam serum levels.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the blockade.
* **Warfarin:** May decrease the effect of warfarin; INR monitoring is recommended.
* **Methotrexate:** May decrease methotrexate clearance and increase toxicity; monitor methotrexate levels.
* **Live attenuated bacterial vaccines:** May decrease their efficacy.
## Monitoring
* Renal function (baseline and during therapy, especially with concurrent nephrotoxic agents).
* Liver function tests.
* Complete blood count (especially for prolonged therapy or suspected hematologic effects).
* Signs and symptoms of hypersensitivity reactions.
* Signs and symptoms of C. difficile infection.
* INR if patient is on warfarin.
## Clinical Pearls
* Tazobactam is a beta-lactamase inhibitor that protects piperacillin from degradation by many beta-lactamase-producing bacteria.
* Administer by intravenous infusion over at least 30 minutes.
* Use with caution in patients with a history of gastrointestinal disease, particularly colitis.
* In patients with cystic fibrosis, higher doses or more frequent administration may be needed due to increased clearance.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional guidelines before administering any medication.
