A Study to Test How BI 3031185 is Tolerated by People With Borderline Personality Disorder or Attention-deficit/Hyperactivity Disorder

This study is looking for both men, women, and non-binary individuals who are between 18 and 45 years old. To take part, you must have a clear diagnosis of either Borderline Personality Disorder (BPD) or Attention Deficit Hyperactivity Disorder (ADHD).

There are also some important lifestyle requirements. You'll need to be willing to avoid alcohol for 24 hours before certain visits and for 72 hours after taking the study medicine. All other recreational drugs, including cannabis, need to be avoided for 72 hours before specific visits and 72 hours after the study medicine, and for the entire study duration. If you take prescribed stimulants for ADHD, you'll need to stop them for 72 hours before certain visits and 24 hours after taking the study medicine.

You cannot join this study if you've ever had certain mental health conditions like schizophrenia or bipolar disorder. You also can't participate if you have an unstable mental health condition or a recent history of moderate to severe substance use issues. If you test positive for drugs, you may still be able to join if it's not a severe issue and the study doctor agrees.

If you decide to take part, the study will last about 1 to 2 months. During this time, you will have six visits to the study clinic and three check-ups over the phone or by video call. For two of the hospital visits, you will need to stay overnight for two nights each time. This is so the doctors can closely monitor your health and how you respond to the medicine. You will take the study medicine (either BI 3031185 or the placebo) as tablets. Throughout all your visits, doctors will regularly check your health and make a note of any effects, especially unwanted ones, to ensure your safety.