Tanzo IV Injection 4.5gTanzo IV Injection 4. 5g Overview Tanzo IV Injection 4. 5g is a combination of Piperacillin and Tazobactam, an intravenous antibiotic used to treat bacterial infections. It is particularly useful for managing infections caused by Gram positive and Gram negative bacteria. The combination of Piperacillin, a potent penicillin antibiotic, and Tazobactam, a beta lactamase inhibitor, enhances the effectiveness of the treatment, making it more effective