Meropenem + Sulbactam is a combination of two medicines: Meropenem + Sulbactam1 and Meropenem + Sulbactam2. Meropenem + Sulbactam1 is an antibiotic. It works by preventing the formation of the bacterial protective covering which is essential for the survival of bacteria in the human body. Meropenem + Sulbactam2 is a beta-lactamase inhibitor which blocks the action of enzymes produced by bacteria to inactivate Meropenem + Sulbactam1. Addition of Meropenem + Sulbactam2 reduces resistance and enhances the activity of Meropenem + Sulbactam1 against bacteria.