Inj.PHORZONE -TZ is a combination of two medicines: Ceftriaxone 1G and Tazobactum 125. Ceftriaxone 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 Ceftriaxone against bacteria.