A compound of Formula I, or a pharmaceutically acceptable salt thereof; wherein: E is S or Se; R 1 and R 2 are optional substituents, and are at each occurrence independently selected from: a halogen, which is preferably selected from F, Cl and Br; C 1 -C 4 alkyl, such as C 1 -C 2 alkyl or C 1 alkyl, optionally substituted with one or more halogen atoms, each of which is preferably selected from F, Cl and Br; and C 1 -C 4 alkoxy, such as C 1 -C 2 alkoxy or C 1 alkoxy; optionally substituted with one or more halogen atoms, each of which is preferably selected from F, Cl 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; for use in the treatment or control of a condition selected from: - gambling disorder; - excessive use of computers, the internet or video games; - pyromania, kleptomania, trichotillomania and intermittent explosive disorder; - emotionally unstable personality disorder, wherein the emotionally unstable personality disorder is selected from borderline personality disorder, aggressive personality disorder and explosive personality disorder; - dopamine-agonist induced impulsive control disorder; - intentional self harm; and - ADHD. E is S or Se; R 1 and R 2 are optional substituents, and are at each occurrence independently selected from: a halogen, which is preferably selected from F, Cl and Br; C 1 -C 4 alkyl, such as C 1 -C 2 alkyl or C 1 alkyl, optionally substituted with one or more halogen atoms, each of which is preferably selected from F, Cl and Br; and C 1 -C 4 alkoxy, such as C 1 -C 2 alkoxy or C 1 alkoxy; optionally substituted with one or more halogen atoms, each of which is preferably selected from F, Cl and Br; a halogen, which is preferably selected from F, Cl and Br; C 1 -C 4 alkyl, such as C 1 -C 2 alkyl or C 1 alkyl, optionally substituted with one or more halogen atoms, each of which is preferably selected from F, Cl and Br; and C 1 -C 4 alkoxy, such as C 1 -C 2 alkoxy or C 1 alkoxy; optionally substituted with one or more halogen atoms, each of which is preferably selected from F, Cl 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; for use in the treatment or control of a condition selected from: - gambling disorder; - excessive use of computers, the internet or video games; - pyromania, kleptomania, trichotillomania and intermittent explosive disorder; - emotionally unstable personality disorder, wherein the emotionally unstable personality disorder is selected from borderline personality disorder, aggressive personality disorder and explosive personality disorder; - dopamine-agonist induced impulsive control disorder; - intentional self harm; and - ADHD. - gambling disorder; - excessive use of computers, the internet or video games; - pyromania, kleptomania, trichotillomania and intermittent explosive disorder; - emotionally unstable personality disorder, wherein the emotionally unstable personality disorder is selected from borderline personality disorder, aggressive personality disorder and explosive personality disorder; - dopamine-agonist induced impulsive control disorder; - intentional self harm; and - ADHD.