Tazobactum%2525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520piperacillin

# 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 bactericidal and effective 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) ## Adult Dosing Standard dose is 3.375 grams (3g piperacillin / 0.375g tazobactam) or 4.5 grams (4g piperacillin / 0.5g tazobactam) IV every 6 or 8 hours. * **Complicated Intra-abdominal Infections, Complicated Skin and Skin Structure Infections, Community-Acquired Pneumonia, Nosocomial Pneumonia:** Typically 3.375 grams IV every 6 hours or 4.5 grams IV every 8 hours for 4-14 days. * **Febrile Neutropenia:** Typically 4.5 grams IV every 6 hours for 7 days or until neutrophil recovery and fever resolution. Dosage and duration vary based on infection severity, pathogen susceptibility, and clinical response. Specific dosing regimens for certain indications may be guided by local protocols. ## Pediatric Dosing Dosing is based on piperacillin component weight. * **Neonates and Infants < 2 months:** Dosing is complex and typically 80 mg piperacillin / 10 mg tazobactam per kg per dose every 8 or 12 hours. Consult specific pediatric guidelines for neonates. * **Children ≥ 2 months:** 240 mg piperacillin / 30 mg tazobactam per kg per day IV divided every 6 or 8 hours. Maximum daily dose is 16 g piperacillin / 2 g tazobactam. Dosing in pediatric patients with severe infections or significant pharmacokinetic variability may require further adjustment. ## Dose Adjustments * **Renal Impairment (CrCl < 20 mL/min):** Reduce the dose frequency or total daily dose. For 6-hour dosing intervals, maintain the dose but extend the interval to 8 hours. For 8-hour dosing intervals, maintain the dose but extend the interval to 12 hours. In severe cases, consult specific guidelines for dose reduction percentages. * **Hepatic Impairment:** No specific dose adjustment is usually recommended, but caution is advised. ## Contraindications * Hypersensitivity to piperacillin, tazobactam, other penicillins, or beta-lactamase inhibitors. * History of severe allergic reaction (e.g., anaphylaxis) to any beta-lactam antibiotic. ## Adverse Effects Common: Diarrhea, nausea, vomiting, rash, headache, insomnia, elevated liver enzymes. Serious: *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (rare, especially with high doses or renal impairment), neutropenia, thrombocytopenia. ## Key Drug Interactions * **Probenecid:** May increase and prolong piperacillin-tazobactam plasma concentrations. * **Neuromuscular blocking agents (e.g., vecuronium):** Piperacillin may prolong the effect of vecuronium. * **Warfarin:** May decrease the effect of warfarin, leading to a decrease in INR. Monitor INR closely. * **Methotrexate:** May decrease the efficacy of methotrexate. Monitor methotrexate levels. ## Monitoring * Renal function (especially in patients with pre-existing renal impairment or those receiving nephrotoxic agents). * Liver function tests. * Complete blood counts (especially with prolonged therapy). * Signs and symptoms of hypersensitivity reactions. * Stool for *C. difficile* if diarrhea develops. * Clinical signs of infection resolution. ## Clinical Pearls * Piperacillin-tazobactam has broad coverage, including many difficult-to-treat organisms like *Pseudomonas aeruginosa*. * Reconstituted solutions should be used within 24 hours when refrigerated or within 12 hours at room temperature. * Monitor for signs of electrolyte imbalance, especially with prolonged infusions and in patients with compromised renal function. * The addition of tazobactam widens the spectrum of activity by inhibiting beta-lactamases. *** **Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information, institutional guidelines, and patient-specific factors before making treatment decisions.