Abstract: The present invention relates to dosing regimens and methods of using LY3154207, also described as 2-(2,6-dichlorophenyl)-1-[(1S,3R)-3-(hydroxymethyl)-5-(3-hydroxy-3-methylbutyl)-1-methyl-3,4-dihydroisoquinolin-2(1H)-yl]ethanone, and/or pharmaceutical compositions thereof, for treatment of dopaminergic central nervous system disorders. Dopaminergic CNS disorders of the present dosing regimen methods include Parkinson's Disease, Alzheimer's Disease, Lewy body dementia (LBD), Vascular Dementia, Schizophrenia, ADHD, Depression, Autism, chronic musculoskeletal pain, fibromyalgia, cognitive impairment disorders, sleep disorders, excessive daytime sleepiness, narcolepsy, shift work disorder, traumatic brain injury, chronic traumatic encephalopathy, obesity and appetite regulation, mood disorders, lethargy, apathy, and addiction disorders.