Over the past few years, the use of plant-based natural antimicrobials in combination with standard antimicrobial drugs in the treatment of bacterial infections is gaining much recognition (Hemaiswarya et al., 2008). In fact, synergistic interactions between plant extracts and antimicrobial agents are one of the novel ways to overcome the resistance mechanisms of bacteria (Rosato et al., 2010). Such combination could lead to a reduction of the minimum effective dose of the antibiotics needed for treatment, and consequently reduce the adverse effects of the drugs (Fadli et al., 2012). Among natural plant extracts are the essential oils (EOs) obtained from many aromatic and medicinal plants. These have been reported to possess a large number of biological properties including antibacterial and antioxidant activities with applications in the food preservation and pharmaceuticals industry