In patients with Parkinson disease (PD), impulse control disorders (ICDs) such as hypersexuality and pathologic gambling and shopping can be devastating complications of antiparkinsonian treatment. To improve their detection, we investigated clinical features associated with ICDs. Subjects were participants in a longitudinal study of PD. ICDs were associated with use of dopamine agonists and depressed mood, disinhibition, irritability, and appetite disturbance.