Dopamine in general is a neurotransmitter, a chemical used to help cells transmit impulses, just as electricity is needed for lighting, and electricity needs to be transmitted through wires. The brain needs to transmit signals between cells in order to respond properly to the stimulus sensations of the external environment, and the transmission of signal impulses requires chemicals, of which dopamine is an important one. Dopamine acts primarily in the brain’s reward system, transmitting messages of excitement and pleasure, and is associated with human lust and feelings. In addition, dopamine has also been associated with various addictive behaviors. Therefore, Parkinson’s disease is a disease caused by degeneration of dopaminergic neurons in the brain, and most patients have a combination of mood disorders, depression and apathy. Because this disease is due to a decrease in dopamine, when dopaminergic medications are taken, they can improve the mood disorders of Parkinson’s disease patients in addition to the motor symptoms of Parkinson’s disease patients. Because this dopamine is associated with addictive behaviors, some patients may have difficulty with impulse control and even develop addictive behaviors after taking dopaminergic medications. After patients take dopaminergic drugs, some people exhibit pathological gambling, particularly good gambling or shopping sprees, all of which are addictive behaviors of dopaminergic drugs and are associated with causing difficulties with impulse control.