Attention Deficit Hyperactivity Disorder

Inclusion Criteria : - Patients aged over 15 years and 3 months - For whom a diagnosis of ADHD has been confirmed less than 6 weeks ago - For whom the diagnosis of one or more addictive disorder(s) (substance use disorder or behavioral addiction) has been confirmed - Meeting the indication for treatment with MPH according to European recommendations (Kooij et al., 2019) - For patients who can actually benefit from MPH: who have not yet started taking MPH - Social security affiliates Exclusion Criteria : - Presenting disorders of higher cognitive functions (at the discretion of the referring clinician or the investigator making the inclusion), making data collection impossible - Presenting difficulties in reading or writing the French language making data collection impossible - Unable to commit to being available for the 2 visits planned as part of the cohort - Under guardianship or legal protection Always talk to your doctor about whether this trial is right for you.