The invention relates to the treatment of impulsivity-related disorders, such as a substance-related addiction, a behavioural addiction, relapse to a substance-related or behavioural addiction, a habit or impulsive disorder, an emotional unstable personality disorder, intentional self harm, an eating disorder, a dopamine agonist-induced impulse control disorder, or attention deficit hyperactivity disorder (ADHD) by administering a compound of Formula I or a salt thereof to a subject; Formula (I) wherein: E is S or Se; R1 and R2 are optional substituents, and are at each occurrence independently selected from: (1) a halogen, which is preferably selected from F, CI and Br; (2) C1-C4 alkyl, such as C1-C2 alkyl or C1 alkyl, optionally substituted with one or more halogen atoms, each of which is preferably selected from F, CI and Br; and (3) C1-C4 alkoxy, such as C1-C2 alkoxy or C1 alkoxy; optionally substituted with one or more halogen atoms, each of which is preferably selected from F, CI and Br; m is an integer in the range of from 0 to 5; and n is an integer in the range of from 0 to 4. The compound can also be used to treat or control impulsivity control disorders in patients undergoing dopamine agonist treatment, for example in patients suffering from Parkinson's disease or ADFID.