PHORCEF-TZ is a combination of two medicines: Cefoperazone 1G and Tazobactum 125 MG. Cefoperazone is an antibiotic. It works by preventing the formation of the bacterial protective covering which is essential for the survival of bacteria. Tazobactum is a beta-lactamase inhibitor which reduces resistance and enhances the activity of Cefoperazone against bacteria.