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Which medication should be used as first-line therapy for Parkinson disease (PD) has been an open and important question. To address this question, researchers conducted a pragmatic, open-label, randomized trial in patients with a new diagnosis of PD. The 1620 patients were randomized to receive a dopamine agonist (632 patients), a monoamine oxidase inhibitor (MAOBI; 460 patients), or levodopa (528 patients). Both patients and clinicians were aware of their treatment status. The primary outcome was the mobility dimension on the Parkinson's disease questionnaire (PDQ-39) quality-of-life scale.
Median follow-up was 3 years. The average PDQ-39 mobility score over the first 7 years was 1.8 points better with levodopa than with the other two trea…