Chapter 24: Impulse-Control Disorders

Impulse-control disorders represent a category of psychiatric conditions characterized by difficulty resisting urges to engage in actions that are harmful to oneself or others, despite awareness of negative consequences. This chapter examines three primary disorders within this classification: intermittent explosive disorder, pyromania, and kleptomania. Intermittent explosive disorder manifests as recurrent episodes of severe verbal or physical aggression that are markedly disproportionate to any precipitating stressor, typically emerging during adolescence with onset frequently linked to experiences of trauma or adversity. The condition shows substantial overlap with substance use disorders, posttraumatic stress disorder, personality disorders, and mood disturbances. Neurobiological mechanisms underlying intermittent explosive disorder involve dysfunction of the prefrontal cortex and dysregulation of serotonergic neurotransmission, potentially accompanied by inflammatory processes that amplify aggressive responding. Pyromania involves deliberate and repetitive fire-setting behavior driven by tension relief and fascination with fire rather than external motivations such as financial gain or revenge, distinguishing it from criminally motivated arson. Kleptomania consists of recurrent urges to steal items regardless of their monetary or practical value, characterized by ego-dystonic awareness of the behavior, with tension building before theft and relief following the act. This disorder occurs more frequently in women and commonly co-occurs with obsessive-compulsive disorder, eating disorders, and mood disorders, potentially reflecting shared orbitofrontal cortex dysfunction and impulsivity mechanisms. Across all three disorders, evidence implicates serotonergic dysregulation and abnormalities in prefrontal inhibitory control. Treatment approaches are multimodal, incorporating selective serotonin reuptake inhibitors, mood-stabilizing medications, antipsychotic agents, and cognitive-behavioral interventions including exposure and response prevention techniques. For kleptomania specifically, opioid antagonists such as naltrexone have demonstrated efficacy in reducing urge-driven stealing behavior. The chapter emphasizes the chronic, often concealed presentation of these disorders and the importance of addressing underlying neurobiological vulnerabilities through integrated biological and psychological interventions.