Tazobactum%252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520piperacillin

# Piperacillin/Tazobactam ## Overview Piperacillin/tazobactam is a combination antibiotic consisting of piperacillin, a broad-spectrum penicillin antibiotic, and tazobactam, a beta-lactamase inhibitor. Tazobactam protects piperacillin from degradation by many beta-lactamase enzymes, thereby extending its spectrum of activity to include many gram-negative bacteria. ## Primary Indications * Complicated intra-abdominal infections * Complicated skin and skin structure infections (including diabetic foot infections) * Community-acquired pneumonia * Hospital-acquired pneumonia (including ventilator-associated pneumonia) * Empirical treatment for febrile neutropenia (in combination with an aminoglycoside or other appropriate agent) * Moderate to severe bacterial infections caused by susceptible organisms. ## Adult Dosing * **Standard Dose:** 3.375 grams every 6 hours (3 grams piperacillin/0.375 grams tazobactam). * **Higher Dose (for more severe infections or specific pathogens):** 4.5 grams every 6 or 8 hours (4 grams piperacillin/0.5 grams tazobactam). * **Duration of Therapy:** Typically 7-14 days, depending on the infection and clinical response. * **Maximum Daily Dose:** Not explicitly defined, but depends on the chosen interval and strength. High-dose regimens are usually limited to 4.5 grams every 6 hours (total of 18 grams daily). ## Pediatric Dosing Dosing is typically based on the piperacillin component and is generally administered every 6 or 8 hours. * **Children 2 months and older:** Dosing varies based on indication and severity. A common range for moderate to severe infections is 80-100 mg piperacillin/10 mg tazobactam per kg per dose, administered every 6 or 8 hours. * **Neonates and Infants < 2 months:** Dosing is less established and requires careful consideration of gestational and postnatal age. Consult specialized pediatric guidelines or infectious disease resources. * **Maximum dose:** Avoid exceeding the adult maximum dose of 4 grams piperacillin per dose. ## Dose Adjustments * **Renal Impairment (CrCl < 20 mL/min):** Reduce the dose frequency. For standard 3.375 g every 6-hour dosing, administer every 8 hours. For standard 4.5 g every 6-hour dosing, administer every 8-12 hours. For standard 4.5 g every 8-hour dosing, administer every 12 hours. If the patient is on intermittent hemodialysis, administer the usual dose after each dialysis session. * **Hepatic Impairment:** No dose adjustment is typically required. ## Contraindications * Hypersensitivity to piperacillin, tazobactam, other penicillins, or beta-lactams. * History of cholestatic jaundice or hepatic dysfunction associated with piperacillin/tazobactam use. ## Adverse Effects * **Common:** Diarrhea, nausea, vomiting, rash, headache, insomnia, constipation, dysgeusia. * **Serious:** * **Hypersensitivity Reactions:** Anaphylaxis, Stevens-Johnson syndrome, toxic epidermal necrolysis. * **Clostridioides difficile-associated diarrhea (CDAD):** Can range from mild diarrhea to fatal colitis. * **Hematologic Effects:** Neutropenia, thrombocytopenia, anemia, leukopenia, eosinophilia. * **Renal Effects:** Interstitial nephritis, acute kidney injury. * **Hepatic Effects:** Elevated liver enzymes, cholestatic hepatitis. * **Neurologic Effects:** Seizures (especially at high doses or in patients with renal impairment). * **Electrolyte Imbalances:** Hypernatremia (due to sodium content in the formulation). ## Key Drug Interactions * **Probenecid:** Increases and prolongs piperacillin/tazobactam plasma concentrations. * **Neuromuscular Blocking Agents (e.g., vecuronium):** Piperacillin may prolong the neuromuscular blockade. * **Methotrexate:** Piperacillin may decrease methotrexate levels. * **Warfarin:** May decrease INR. Monitor INR closely. * **Bacteriostatic Antibiotics (e.g., tetracyclines, macrolides):** May antagonize the effect of piperacillin/tazobactam. * **Oral Contraceptives:** Piperacillin may reduce the efficacy of oral contraceptives. ## Monitoring * **Renal function:** Baseline and periodic monitoring of serum creatinine and estimated Glomerular Filtration Rate (eGFR). * **Liver function tests:** Baseline and periodic monitoring of AST, ALT, and bilirubin, especially with prolonged therapy. * **Complete blood count (CBC) with differential:** Monitor for hematologic changes. * **Electrolytes:** Monitor sodium levels, particularly in patients with renal impairment or receiving large doses. * **Signs and symptoms of infection:** Clinical response to therapy. * **Signs and symptoms of CDAD:** Diarrhea, abdominal cramping, fever. * **Signs and symptoms of hypersensitivity reactions.** ## Clinical Pearls * Piperacillin/tazobactam is a valuable agent for empiric therapy in serious infections, including those caused by resistant gram-negative organisms and some anaerobes. * Consider the sodium load associated with administration, especially in patients with heart failure or on sodium-restricted diets. Each 3.375 g dose contains approximately 2.3 mmol (53 mg) of sodium, and each 4.5 g dose contains approximately 3.1 mmol (71 mg) of sodium. * Reconstituted solutions are stable for 24 hours at room temperature or 48 hours under refrigeration, depending on the diluent. * Ensure adequate hydration and monitor urine output, especially in patients with renal impairment. *** *This information is intended for healthcare professionals. Always consult the current prescribing information and relevant clinical guidelines for complete details and to verify dosing and safety information before initiating or modifying therapy.*