MAOB and Parkinson disease: Doctors focus on improving motor (e.g., tremor, rigidity, and bradykinesia) and nonmotor (e.g., constipation, cognition, mood, and sleep) signs and symptoms.9 Unfortunately, due to the complex pathogenesis of PD, the etiology is still uncertain, and no disease-modifying pharmacologic treatments are available.10 Currently, there are several choices for treating PD, including therapy with carbidopa-levodopa, monoamine oxidase-B inhibitors, and dopamine agonists.