Predictors of Impaired Daytime Sleep and Wakefulness in Patients With Parkinson Disease Treated With Older (Ergot) vs Newer (Nonergot) Dopamine Agonists

Abstract
The newer nonergot dopamine agonists pramipexole dihydrochloride and ropinirole hydrochloride are efficacious in early Parkinson disease (PD) and may be associated with fewer motor fluctuations and dyskinesias than levodopa.1,2 Both are effective adjuncts to levodopa therapy in advanced PD, and their exhibited levodopa-sparing effect may offer a neuroprotective potential in reducing dopamine oxidation metabolism.3