The aim of this study is to evaluate the oxidative stress and brain damage biomarkers induced by tDCS in patients with AD and to assess the long term neurophysiological and behavioral effects after repeated daily tDCS sessions for 10 days. Thirty AD patients diagnosed according to 2011 McKhann criteria will be randomly assigned to receive 10 real anodal tDCS or sham at 2mA intensity for 20 minutes per session daily. All patients will be evaluated at baseline, at the end of the sessions and 1, 2, and 3 months later with neurophysiological and behavioral examination.