Piperacillin And Tazobactam For Injection IP is an antibacterial agent, prescribed for various infections such as Nosocomial pneumonia. It blocks the bacteria’s cell wall growth. This combination medication is an antibacterial agent, prescribed for various infections such as Nosocomial pneumonia. It blocks the bacteria’s cell wall growth, which kills the bacteria. Tazobactam inhibits the action of bacterial beta-lactamases. It is added to the extended spectrum beta-lactam antibiotic piperacillin. It broadens the spectrum of piperacillin by making it effective against organisms that express beta-lactamase and would normally degrade piperacillin.