Cefurav Plus 500 is a combination of two medicines: Cefuroxime and Clavulanic Acid. Cefuroxime 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. Clavulanic Acid is a beta-lactamase inhibitor which blocks the action of enzymes produced by bacteria to inactivate Cefuroxime. Addition of Clavulanic Acid reduces resistance and enhances the activity of Cefuroxime against bacteria.