FOCUS is a study to test how well a medicine called solriamfetol works for adults with ADHD. ADHD stands for Attention Deficit Hyperactivity Disorder, which is a condition that makes it hard to pay attention and stay still. In this study, adults aged 18 to 55 can participate if they have been diagnosed with ADHD. The study will last 6 weeks, and participants will take a pill daily. The pill could be solriamfetol at either 150 mg or 300 mg, or it might be a placebo, which is a pill with no medicine in it. The study is randomized, meaning participants are randomly assigned to one of the groups, and it is double-blind, meaning neither the participants nor the researchers know who is getting which pill. This helps ensure the results are fair and accurate.

• Study duration is 6 weeks with daily medication.
• Participants must be 18 to 55 years old with ADHD.
• No prior use of solriamfetol is allowed.