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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. 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 * Hospital-acquired pneumonia (including ventilator-associated pneumonia) ## Adult Dosing * **Standard Dose:** 3.375 grams (3g piperacillin/0.375g tazobactam) or 4.5 grams (4g piperacillin/0.5g tazobactam) intravenously every 6 to 8 hours. * **Dosing Frequency:** Typically every 6 hours for most indications. Every 8 hours may be used for less severe infections or in combination regimens. * **Duration:** Varies based on indication and patient response, typically 4 to 14 days. * **Higher Doses:** Doses up to 4.5 grams IV every 4 hours may be considered for severe infections or those with suspected or documented P. aeruginosa. ## Pediatric Dosing * **Patients 0 to 12 months:** Dosing is weight-based and depends on the indication and severity of infection. Specific protocols should be followed. * **Patients 1 to 12 years:** * **Dosing:** 80 mg piperacillin/10 mg tazobactam per kg per dose intravenously every 8 hours. * **Maximum Dose:** 3.375 grams per dose. * **For P. aeruginosa:** 100 mg piperacillin/12.5 mg tazobactam per kg per dose intravenously every 8 hours, not to exceed 4.5 grams per dose. * **Duration:** Varies based on indication and patient response. ## Dose Adjustments * **Renal Impairment:** * CrCl > 40 mL/min: No dose adjustment needed. * CrCl 20-40 mL/min: Reduce dose by 25% or increase interval to every 8 hours. * CrCl < 20 mL/min: Reduce dose by 50% or increase interval to every 12 hours. * Hemodialysis: Administer dose after dialysis and increase interval to every 12 hours. Additional dose may be needed during dialysis. * **Hepatic Impairment:** No specific dose adjustment is typically recommended, but caution may be advised. ## Contraindications * Hypersensitivity to piperacillin, tazobactam, other penicillin antibiotics, or any component of the formulation. * History of immediate or severe allergic reaction to beta-lactam antibiotics. ## Adverse Effects * **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, constipation, abdominal pain, fever. * **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (anaphylaxis), seizures (especially with high doses or renal impairment), liver enzyme elevations, interstitial nephritis, hematologic changes (neutropenia, thrombocytopenia, eosinophilia). ## Key Drug Interactions * **Probenecid:** May increase and prolong piperacillin/tazobactam serum concentrations. * **Aminoglycosides:** Concurrent use may result in additive or synergistic activity, but physical incompatibility exists. Do not mix in the same IV line without considering appropriate dilution and flushing. * **Vecuronium:** Piperacillin may prolong the neuromuscular blockade of vecuronium. * **Warfarin:** May alter the anticoagulant response in patients receiving warfarin. Monitor INR closely. * **Methotrexate:** Piperacillin may decrease methotrexate clearance. Monitor methotrexate levels. ## Monitoring * Renal function (especially with impaired renal function or concurrent nephrotoxic agents). * Liver function tests. * Complete blood count (CBC) with differential, especially with prolonged therapy. * Signs and symptoms of hypersensitivity reactions. * Signs and symptoms of *C. difficile* infection. * INR if patient is on warfarin. * Methotrexate levels if applicable. ## Clinical Pearls * Piperacillin/tazobactam is often reconstituted with sterile water for injection and then further diluted in an appropriate IV fluid (e.g., 0.9% sodium chloride). Refer to manufacturer's instructions for preparation. * Infusion time is typically 30 minutes. Longer infusion times may be considered for higher doses or to achieve higher Cmax. * The beta-lactamase inhibitor tazobactam broadens the spectrum of piperacillin to include many beta-lactamase producing organisms. * Consider patient's renal function for appropriate dose adjustments. * Always review current prescribing information for the most up-to-date dosing, administration, and safety information. --- *Disclaimer: This information is intended for healthcare professionals. It is essential to consult the official prescribing information and relevant guidelines for definitive patient care decisions. Dosing may vary based on specific institutional protocols and patient factors.*