Journal
MOVEMENT DISORDERS
Volume 28, Issue 6, Pages 817-820Publisher
WILEY-BLACKWELL
DOI: 10.1002/mds.25395
Keywords
adenosine A2A receptor antagonist; Parkinson's disease; fluctuations; OFF time; clinical trial
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Funding
- Merck Sharp & Dohme Corp., Whitehouse Station, New Jersey
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Background Preladenant is a selective adenosine A2A receptor antagonist under investigation for Parkinson's disease treatment. Methods A phase 2 36-week open-label follow-up of a double-blind study using preladenant 5 mg twice a day as a levodopa adjunct in 140 subjects with fluctuating Parkinson's disease was conducted. The primary end point was adverse event (AE) assessment. Secondary (efficacy) analyses included hours/day spent in OFF and ON states and dyskinesia prevalence/severity. Results The 36-week open-label phase was completed by 106 of 140 subjects (76%). AE-related treatment discontinuations occurred in 19 subjects (14%). Treatment-emergent AEs, reported by 15% of subjects, were dyskinesia (33%) and constipation (19%). Preladenant 5 mg twice a day provided OFF time reductions (1.4-1.9 hours/day) and ON time increases (1.2-1.5 hours/day) throughout the 36-week treatment relative to the baseline of the double-blind study. Conclusions Long-term preladenant treatment (5 mg twice a day) was generally well tolerated and provided sustained OFF time reductions and ON time increases. (c) 2013 Movement Disorder Society
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