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# Piperacillin/Tazobactam
## Overview
Piperacillin/tazobactam is a combination antibiotic consisting of piperacillin, a broad-spectrum penicillinase-susceptible penicillin, and tazobactam, a beta-lactamase inhibitor. It is active against many Gram-positive, Gram-negative, and anaerobic bacteria.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Febrile neutropenia (empiric treatment)
* Bacterial infections known or suspected to be caused by piperacillin-resistant, beta-lactamase producing bacteria
## Adult Dosing
* **Standard Dosing:** 3.375 grams every 6 hours or 4.5 grams every 6 or 8 hours, administered intravenously over 30 minutes.
* **Dosing based on severity:**
* **Complicated intra-abdominal infections, complicated skin and skin structure infections, community-acquired pneumonia, and nosocomial pneumonia:** 3.375 grams every 6 hours or 4.5 grams every 8 hours.
* **Severe infections:** 4.5 grams every 6 hours.
* **Febrile Neutropenia:** 4.5 grams every 6 hours.
* **Duration:** Typically 7 to 14 days.
* **Maximum Daily Dose:** Not explicitly defined, but doses of 4.5 grams every 6 hours are common.
## Pediatric Dosing
* **Patients 2 months and older:** Dosing is based on piperacillin component.
* **Mild to moderate infections:** 100 mg piperacillin/12.5 mg tazobactam per kg per dose, administered intravenously every 8 hours.
* **Severe infections:** 150 mg piperacillin/18.75 mg tazobactam per kg per dose, administered intravenously every 6 hours.
* **Maximum dose:** Do not exceed 4.5 grams of piperacillin/0.56 grams of tazobactam per dose.
* **Infants younger than 2 months:** Dosing and safety have not been established.
## Dose Adjustments
* **Renal Impairment (CrCl < 40 mL/min):**
* For doses given every 8 hours: 2.25 grams every 8 hours.
* For doses given every 6 hours: 3.375 grams every 8 hours.
* For doses given every 4 hours: 4.5 grams every 12 hours.
* Hemodialysis: Administer the standard dose after each dialysis session.
* **Hepatic Impairment:** No specific dose adjustment recommended.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other penicillins, or any component of the formulation.
## Adverse Effects
* **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, constipation, abdominal pain, rash, pruritus.
* **Serious:** Clostridioides difficile-associated diarrhea, hypersensitivity reactions (anaphylaxis, Stevens-Johnson syndrome, DRESS), seizures (especially with renal impairment and high doses), neutropenia, thrombocytopenia, prolonged bleeding times.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin/tazobactam plasma concentrations.
* **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade.
* **Warfarin:** May decrease the efficacy of warfarin. Monitor INR closely.
* **Methotrexate:** May decrease methotrexate levels.
## Monitoring
* **Renal function:** Especially in patients with known renal impairment or those receiving nephrotoxic agents.
* **Liver function tests:** Periodic monitoring is recommended.
* **Hematologic parameters:** Complete blood count with differential and platelet count, particularly with prolonged therapy.
* **Signs and symptoms of hypersensitivity reactions:** Monitor closely during and after administration.
* **Signs and symptoms of C. difficile infection.**
## Clinical Pearls
* Piperacillin/tazobactam provides coverage against many extended-spectrum beta-lactamase (ESBL) producing organisms, but resistance can occur.
* It is a common choice for empiric therapy in serious infections, particularly in the hospital setting.
* The reconstituted solution is stable for 24 hours at room temperature or 48 hours when refrigerated. Further dilution in compatible IV fluids is required for infusion.
* Monitor for electrolyte imbalances, particularly hypokalemia, which can occur with high doses or prolonged infusions.
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*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 guidelines before administering any medication.*
