“…Carbidopa-levodopa improves motor symptoms to a variable extent but does not substantially affect non-motor aspects of the disease [ 7 , 19 , 20 ]. With prolonged use, patients become less responsive to dopaminergic agents and experience a narrowing therapeutic window with side effects such as motor fluctuations, dyskinesias, autonomic nervous system dysfunction, and various neuropsychiatric symptoms [ 7 , 18 , 21 ]. Alternative therapies for PD include dopamine agonists, anticholinergics, monoamine oxidase inhibitors (MAOIs), catechol-O-methyl transferase inhibitors (COMTIs), deep brain stimulation, focused ultrasound lesioning, and botulinum neurotoxins [ 2 , 7 , 8 , 22 ].…”