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"Zosyn" redirects here. It is not to be confused with any one of a number of different, unrelated drugs whose names begin with "Zo-."
Combination of
Piperacillin Ureidopenicillin antibiotic
Tazobactam Beta-lactamase inhibitor
Clinical data
AHFS/Drugs.com monograph
MedlinePlus a694003
  • US: B (No risk in non-human studies)
Intravenous infusion
123683-33-0 N
PubChem CID 9918881
ChemSpider 8094523 YesY
 N (what is this?)  (verify)

Piperacillin/tazobactam is a combination antibiotic containing the extended-spectrum penicillin antibiotic piperacillin and the β-lactamase inhibitor tazobactam. It is commercially available as Tazocin (Canada, UK, Australia and New Zealand, Italy, marketed by Pfizer), Biopiper TZ (India.,marketed by Biocon ltd) and Zosyn (U.S., by Pfizer inc). The combination has activity against many Gram-positive and Gram-negative pathogens and Pseudomonas aeruginosa.


Its main uses are in intensive care medicine (pneumonia, peritonitis), some diabetes-related foot infections, and empirical therapy in febrile neutropenia (e.g., after chemotherapy). The drug is administered intravenously every 6 or 8 hr, typically over 30 min. It may also be administered by continuous infusion over four hours. Prolonged infusions are thought to maximize the time that serum concentrations are above the minimum inhibitory concentration (MIC) of the bacteria implicated in infection.

Adverse reactions[edit]

The most common adverse reaction is diarrhea (7% to 11%).[1] One study showed Clostridium difficile-associated diarrhea happened in 4.9% of the patients on piperacillin/tazobactam.[2] One other side effect is inhibition of platelets (thrombocytopenia).[3]

Trade names[edit]

Apart from Tazocin and Zosyn, the drug is marketed in various countries under names such as Brodactam, Piptaz, Maxitaz, Kilbac, Trezora, and Biopiper TZ.


External links[edit]