Tazobactum%2525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520piperacillin

# Piperacillin/Tazobactam ## Overview Piperacillin/tazobactam is a combination penicillin-class antibiotic (piperacillin) and beta-lactamase inhibitor (tazobactam). It is active against a broad spectrum of 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 (often in combination with an aminoglycoside) ## Adult Dosing Standard adult dose is 3.375 g (piperacillin 3 g/tazobactam 0.375 g) or 4.5 g (piperacillin 4 g/tazobactam 0.5 g) intravenously every 6 to 8 hours. Dosing frequency and duration are dependent on the indication and severity of infection. For severe infections, doses of 4.5 g every 4 hours may be used. Maximum daily dose is generally 18 g. ## Pediatric Dosing Dosing is based on piperacillin component: * **1 month to 12 years:** 90-100 mg piperacillin/kg/dose intravenously every 6 to 8 hours. Do not exceed the adult maximum dose of 4 g piperacillin per dose. * **Neonates < 1 month:** Dosing is less well established and depends on gestational and postnatal age. Consult specialized pediatric guidelines or resources. ## Dose Adjustments * **Renal Impairment (CrCl < 20 mL/min):** Reduce dose and/or increase interval. Standard doses should be reduced by 33-50% and administered every 8-12 hours. * **Hepatic Impairment:** No specific dose adjustment is recommended, but caution is advised. ## Contraindications * History of hypersensitivity to piperacillin, tazobactam, or other beta-lactam antibiotics. * History of immediate or severe allergic reaction to penicillin. ## Adverse Effects Common: Diarrhea, rash, nausea, vomiting, headache, insomnia, fever, injection site reactions. Serious: *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (especially with high doses or renal impairment), neutropenia, thrombocytopenia, increased serum creatinine, elevated liver enzymes. ## Key Drug Interactions * **Probenecid:** May decrease renal excretion of piperacillin, increasing serum concentrations. * **Neuromuscular blocking agents:** Piperacillin may prolong the effect of vecuronium. * **Warfarin:** May decrease the effect of warfarin; monitor INR closely. * **Methotrexate:** May decrease methotrexate clearance; monitor methotrexate levels. ## Monitoring * Renal function (baseline and periodically) * Liver function tests (periodically) * Complete blood count (periodic, especially with prolonged therapy or high doses) * Signs and symptoms of infection * Signs of hypersensitivity reactions ## Clinical Pearls * Reconstituted solutions should be used within specified timeframes due to potential degradation. * Monitor for signs of *C. difficile* infection, especially if diarrhea develops. * Dosing in critically ill patients may require pharmacokinetic considerations and should align with institutional protocols. * The beta-lactam/beta-lactamase inhibitor combination provides broader coverage than piperacillin alone, particularly against many beta-lactamase producing organisms. *** **Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional guidelines for complete details on dosing, administration, safety, and indications.