MEthylphenidate in ADHD - Addiction(s) Comorbidity: Value of Adding a Cognitive Remediation Program to Improve Short- and Medium-term Therapeutic Response

Inclusion Criteria: * Age over 18; * Diagnosis of ADHD confirmed by DIVA-5 interview following a specialized ADHD-addiction(s) consultation; * Indication for MPH treatment according to European recommendations (J. J. S. Kooij et al., 2019) and absence of contraindications (particularly cardiological); * Presence of at least one comorbid addictive disorder (SUD and/or BA); * Having given their consent to take part in the study; * Being affiliated to the French social security system or benefiting from such a system. Exclusion Criteria: * Presence of disorders of the higher functions or difficulties in reading or writing the French language making it impossible to collect data; * Pregnant or breast-feeding woman; * Person deprived of liberty; * Person under compulsory psychiatric care; * Participation in another interventional research protocol involving another psychotherapeutic or pharmacological intervention that may have an impact on clinical outcome; * Guardianship or safeguard of justice. * Patients who consumned psychoactive substances within 12 hours prior to their visit.