Study Overview: This study is testing new treatments for PTSD (Post-Traumatic Stress Disorder), a condition where people feel stressed or scared even when they're not in danger, often after experiencing a traumatic event. The study is organized into three main parts: 30 days of screening to see if you qualify, 12 weeks of treatment, and 4 weeks of safety follow-up to ensure your well-being.

How It Works: The study is designed to test different medicines, with some people receiving a placebo (a harmless pill with no effect) to compare results. Participants won't know if they're receiving the actual medicine or the placebo, which is called double-blind testing. The study will adapt as it goes, adding new groups if necessary, and aims to find the best treatment options.

• **Length of Study**: Approximately 4 months for each participant.
• **Visits**: Regular check-ups will be required throughout the study.
• **Eligibility**: Must be 18-64 years old, have PTSD symptoms, and be a current or former military member.

Note: Participants should not be pregnant, have certain mental health conditions, or be taking specific medications. If you're interested, you may need to undergo tests, like blood draws and MRIs.