The use of 4-[2-(4-methylphenylsulfanyl)phenyl]-piperidine and acid additions salts thereof for the treatment of ADHD, melancholia, treatment resistant depression or residual symptoms in depression is provided.本發明提供4-[2-(4-甲基苯硫基)苯基]哌啶及其酸加成鹽用於治療注意力不足過動症(ADHD)、憂鬱症、頑抗型抑鬱或抑鬱之殘留症狀的用途。