Microtaz 4.5gm Injection 1's belongs to the 'Antibiotics' class of drugs, primarily used to treat bacterial infections. It is used to treat various hospital-acquired and ventilator-associated pneumonia, urinary tract infections, intra-abdominal infections, skin and soft tissue infections (like diabetic foot infections) and uterine infections. Bacterial infection occurs when harmful bacteria grow in the body and causes illness. It can infect any part of the body and multiply very quickly.

Microtaz 4.5gm Injection 1's contains two medicines, namely: Piperacillin (Penicillin antibiotic) and Tazobactam (beta-lactamase inhibitor). Piperacillin belongs to the class of 'Penicillin antibiotics.' It has bactericidal (ability to kill bacteria) activity against gram-positive and gram-negative aerobic (requires oxygen to survive) and anaerobic (survives with little or no oxygen) bacteria. Piperacillin acts by binding to the penicillin-binding proteins (PBPs) inside the bacterial cell wall and inhibits its cell wall synthesis. Tazobactam is a beta-lactamase inhibitor. Beta-lactamases are the enzymes produced by bacteria to gain multi-resistance to β-lactam antibiotics, such as penicillins and cephalosporins. Tazobactam prevents the breakdown of other antibiotics by beta-lactamase enzyme-producing organisms. In Microtaz 4.5gm Injection 1's, Tazobactam works by preventing bacteria from destroying Piperacillin.