After a single treatment with the EO, mice showed a significant increase in LDB parameters, in contrast to long-term treatment, either with the EO or with the DZP, which produced no such increases (Fig. 1). In this procedure, only the animals repeatedly treated with saline that received DZP 30 min before the experimental procedure showed significant differences on the LDB anxiety parameters. Long- term treatment with the EO at 100 mg/kg produced a behavioral profile similar to that observed with DZP in the same conditions, with statistical significance in reducing the number of rearings and transitions between black and white compartments, without observable effects on motor coordination in the rota-rod test (Table 3). The reduction in efficacy after long-term treatment with DZP, and perhaps with the EO, could be due to the development of tolerance (Reynolds, 2008), as already described in mice after two weeks of continuous DZP use (Flaishon et al., 2003) and which is an EO hypothesis also assessed in other species (Pultrini et al., 2006).