Attention Deficit Hyperactivity Disorder

The ADA cohort aims for the systematic and standardized collection of sociodemographic, clinical and neuropsychological data, during 2 visits (inclusion and 12 months), from patients suffering from the co-occurrence of ADHD (Attention Deficit Hyperactivity Disorder) and addiction(s), in addition to the treatment as usual adapted to each situation.

Information on the study and diagnosis of ADHD will be carried out during a medical evaluation consultation, as part of routine care. The two research visits (inclusion and at 12 months) will be added by the research and will each include: * A structured clinical interview with a research professional (traceability of oral consent, administration of structured interviews, collection of self-questionnaires, collection of care from the medical record) * A neuropsychological assessment with a neuropsychologist

Inclusion Criteria : * Patients aged over 18 years * For whom a diagnosis of ADHD has been confirmed less than 12 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 * Patients who have used psychoactive substances within 12 hours prior to their visit