The purpose of this study is: (1) to examine the effectiveness of reconsolidation blockade as a treatment for trauma-related disorders, (2) to evaluate the feasibility of implementing this new treatment on a large scale in a short delay. This clinical trial as been set up in response to the Paris attacks to increase treatment capacity of the AP-HP (Assistance Publique des Hopitaux de Paris) hospital network.. Reconsolidation blockade will be compared to treatment as usual (TAU), on symptoms reduction after 6 weeks of treatment. In order to measure effectiveness and cost-effectiveness, socioeconomic measures, quality of life and social functioning outcomes will be measured pre- and post-treatment as well as 3 and 12 months after study enrollment.