Posttraumatic stress disorder (PTSD) is a condition that can make people feel very stressed after a scary event. This study is trying a new way to help people with PTSD feel better. It uses a medicine called MDMA, which is known to make people feel close and peaceful, along with a type of therapy called Prolonged Exposure therapy (PE). In this study, everyone will have 10 days of therapy sessions, and on the second day, they will take MDMA during the session. The study is happening at the Emory Brain Health Center.

• It lasts for 10 days with daily visits.
• Participants will take MDMA once on the second day.
• Researchers will collect data about how your body reacts.

To join, you need to have PTSD, be able to read English, and agree to certain rules, like not taking part in other studies and using birth control if necessary. You will also need to have some medical checks. It's important to know that not everyone can join, especially if you have certain health issues or are pregnant. This study is a chance to try a new treatment that could help with PTSD symptoms.