This randomized clinical trial evaluates the effectiveness of eye movement desensitization and reprocessing (EMDR) therapy in reducing symptoms of post-traumatic stress disorder (PTSD). Participants with PTSD symptoms will be randomly assigned in a 1:1 ratio to either immediate EMDR in addition to treatment as usual (EMDR+TAU) or delayed EMDR following an initial treatment-as-usual period (TAU+EMDR). Randomization will be stratified by sex.
PTSD symptoms will be assessed using the PTSD Checklist for DSM-5 (PCL-5) at baseline (T1), after the first treatment period (T2), and after the second treatment period (T3). The primary outcome is PTSD symptom severity measured by the PCL-5 at T2, comparing participants receiving EMDR+TAU with those receiving TAU alone during the first treatment period.
Secondary outcomes include clinically meaningful improvement in PTSD symptoms, defined as a reduction of at least 10 points on the PCL-5, symptom change during the initial treatment-as-usual period, the effect of delayed EMDR, and the durability of the EMDR treatment effect over time.