doripenem or piperacillin + tazobactam

This entry refers to either **doripenem** or the combination **piperacillin + tazobactam**, both of which are broad-spectrum intravenous antibiotics used to treat serious bacterial infections, particularly in hospital settings. Doripenem is a carbapenem antibiotic with a beta-lactam ring, acting by inhibiting bacterial cell wall synthesis through binding to penicillin-binding proteins. Piperacillin + tazobactam combines a ureidopenicillin (piperacillin) with a β-lactamase inhibitor (tazobactam), extending activity to β-lactamase producing organisms. Both agents are bactericidal and used in the treatment of complicated intra-abdominal infections, complicated urinary tract infections, nosocomial pneumonia (including ventilator-associated pneumonia), and other serious infections caused by susceptible Gram-negative and Gram-positive bacteria[4][2][7][6][5].