RecruitingDrug trialRedefine Study: A Study Evaluating the Efficacy, Safety, and Tolerability of COMP360 in Participants With Post-traumatic Stress DisorderThe Redefine Study (COMP202) is testing COMP360 to see if it may reduce post-traumatic stress disorder (PTSD) symptoms when administered alongside monitoring and support from a trained study team. COMP360 is a lab-made form of the naturally occurring chemical compound psilocybin.