RecruitingPhase 3Drug trialQuetiapine to Reduce Post Concussive Syndrome After Mild Traumatic Brain Injury (mTBI)A two site, 2-arm, Phase III randomized pragmatic clinical trial evaluating the effectiveness of quetiapine monotherapy in comparison to Treatment As Usual (TAU) medication management for symptoms experienced by veterans receiving rehabilitation therapy for mild traumatic brain injury (mTBI) and comorbid symptoms of posttraumatic stress disorder (PTSD).