A psychological disorder characterized by the repeated inability to refrain from performing a particular action that is harmful either to oneself or others.

Impulse control disorders are thought to have both neurological and environmental causes and are known to be exacerbated by stress. Some mental health professionals regard several of these disorders, such as compulsive gambling or shopping, as addictions. In impulse control disorder, the impulse action is typically preceded by feelings of tension and excitement and followed by a sense of relief and gratification, often—but not always—accompanied by guilt or remorse. Researchers have discovered a link between the control of impulses and the neurotransmitter serotonin, a chemical agent secreted by nerve cells in the brain. Selective serotonin reuptake inhibitors (SSRIs), medications such as Prozac that are used to treat depression and other disorders, have been effective in the treatment of impulse...