Tazact 4.5 GM Injection Tazact 4.5 GM contains Piperacillin, a broad-spectrum ureidopenicillin antibiotic, combined with Tazobactam, a beta-lactamase inhibitor. Piperacillin inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), while Tazobactam protects Piperacillin from degradation by beta-lactamase enzymes produced by resistant bacteria. It is indicated for treating serious systemic bacterial infections, including intra-abdominal infections, complicated skin and soft tissue infections, community-acquired and nosocomial pneumonia, pelvic inflammatory disease, and febrile neutropenia.