Parkinson's disease was first described in 1817 by James Parkinson. Based on his observation of only six individuals, Parkinson accurately described the resting tremor and festinate gait, bradykinesia, and postural instability associated with the disease today. Parkinson's disease primarily affects people >50 years of age and causes progressive neurological degeneration, physical disability, and worsening quality of life.

Consequently, most currently available drugs aim to restore striatal dopamine signaling. This can be best reached by increasing the supply of dopamine with oral levodopa (L-dopa), but also by stimulating dopamine receptors directly using dopamine agonists, or by inhibiting the reuptake of endogenous dopamine. Unfortunately, mainly due to the short half-life of L-dopa and the erratic absorption of oral L-dopa (causing pulsatile dopaminergic stimulation) these treatment strategies become increasingly ineffective in the course of this disease, and motor complications may further reduce the quality of life in these patients.