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Background Over the last two decades, several randomised controlled trials (RCTs) have indicated that preventive psychosocial, pharmacologic (Van der Gaag et al. 2013), and nutritional interventions (Amminger et al. 2010) are likely to be beneficial in people at ultra-high risk (UHR) of psychosis, in terms of delaying or preventing a transition to psychosis. Antidepressant medication is commonly prescribed in young people at UHR for psychosis; however, the evidence regarding its efficacy for psychosis prevention is limited (Fusar-Poli et al. 2007; Cornblatt et al. 2007; Fusar-Poli et al. 2015). The main aim of the present study is to investigate the impact of concomitant AD medication on the transition to psychosis rate in young people at ultra-high risk of psychosis who participated in the NEURAPRO trial (McGorry et al. 2017). Methods In this secondary analysis, data from 304 participants of a multicenter, double-blind, placebo-controlled, randomized clinical trial (NEURAPRO) of omega-3 polyunsaturated fatty acids (omega-3 PUFAs) were included. During the trial, concomitant antidepressant medication was permitted for treatment of moderate to severe major depressive disorder (a score of ≥ 21 on the Montgomery-Asberg Depression Rating Scale, MADRS) in all participants. Results Of 304 participants, 189 (62.2%) were treated with ADs. 98 (64.1%) of those were in the omega-3 group and 91 (60.3%) in the placebo group. The transition rate to psychosis was higher in individuals who received AD treatment (13.2%; 25 of 189) as in individuals without ADs (6.1%; 7 of 115). The Kaplan-Meier survival curve estimated a group difference of X2 = 3.237, P = .072 (log rank test). Discussion Antidepressants are widely used in early psychosis. This analysis does not support the view that antidepressants may have reduced the transition to psychosis rate in this cohort. The findings are limited by the fact that antidepressants were prescribed based on clinical discretion. A randomised controlled trial is needed to determine whether antidepressants have a role in prevention of transition to psychosis.

T34. THE IMPACT OF ANTIDEPRESSANT USE ON THE TRANSITION TO PSYCHOSIS RATE IN THE NEURAPRO TRIAL