This study is exploring a new medicine called CYB004 to help adults with a condition called **Generalized Anxiety Disorder (GAD)**, which makes people feel very worried or anxious most of the time. The study will check if the medicine is safe, how well it works, and how it moves through the body. People aged **18 to 65** can join if they have moderate to severe GAD, and they must already be taking a steady dose of medicine for their anxiety but still find it not very helpful. Participants must avoid certain other medicines and substances, like caffeine, during the study. The study does not allow people with certain other mental health disorders or physical health issues, and participants must be able to speak English well.

• **Study Length**: Multiple visits over several weeks.
• **Compensation**: Participants may get reimbursed for their time and travel.
• **Risks**: Some health conditions or medicines may make the study unsafe.