Augmentin 625 Duo Tablet consists of two medicines: Amoxycillin and Clavulanic acid. Amoxycillin acts by destroying the outer protein layer, thereby killing the bacteria (bactericidal action). Clavulanic acid inhibits the enzyme beta-lactamase, which prevents bacteria from destroying the efficacy of amoxycillin. As a result, the action of Clavulanic acid allows Amoxycillin to work better and kill the bacteria. Augmentin 625 Duo Tablet does not work against infections caused by viruses, including colds and flu.